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Interstate 24 (I-24) is an
Interstate Highway The Dwight D. Eisenhower National System of Interstate and Defense Highways, commonly known as the Interstate Highway System, is a network of controlled-access highways that forms part of the National Highway System in the United States. Th ...
in the
Midwestern The Midwestern United States, also referred to as the Midwest or the American Midwest, is one of four census regions of the United States Census Bureau (also known as "Region 2"). It occupies the northern central part of the United States. I ...
and
Southeastern The points of the compass are a set of horizontal, radially arrayed compass directions (or azimuths) used in navigation and cartography. A compass rose is primarily composed of four cardinal directions—north, east, south, and west—each se ...
United States. It runs diagonally from
I-57 Interstate 57 (I-57) is a north–south Interstate Highway in Missouri and Illinois that parallels the old Illinois Central Railroad for much of its route. It runs from Sikeston, Missouri, at I-55 to Chicago, Illinois, at I-94. I-57 ess ...
, south of
Marion, Illinois Marion is a city in Williamson and Johnson Counties, Illinois, United States, and is the county seat of Williamson County. The population was 16,855 at the 2020 census. It is part of a dispersed urban area that developed out of the early 20th ...
, to
Chattanooga, Tennessee Chattanooga ( ) is a city in and the county seat of Hamilton County, Tennessee, United States. Located along the Tennessee River bordering Georgia, it also extends into Marion County on its western end. With a population of 181,099 in 2020, ...
, at
I-75 Interstate 75 (I-75) is a major north–south Interstate Highway in the Great Lakes and Southeastern regions of the United States. As with most Interstates that end in 5, it is a major cross-country, north–south route, traveling from St ...
. It travels through Illinois, Kentucky, Tennessee, and Georgia. As an even-numbered Interstate, it is signed as an east–west route, though the route follows a more southeast–northwest routing, passing through
Nashville, Tennessee Nashville is the capital city of the U.S. state of Tennessee and the county seat, seat of Davidson County, Tennessee, Davidson County. With a population of 689,447 at the 2020 United States census, 2020 U.S. census, Nashville is the List of muni ...
. The numbering deviates from the standard Interstate Highway System grid, lying further north than its number would indicate west of Nashville. I-24 between Nashville and Chattanooga is part of a longer north–south freight corridor which runs between Chicago and
Atlanta Atlanta ( ) is the capital and most populous city of the U.S. state of Georgia. It is the seat of Fulton County, the most populous county in Georgia, but its territory falls in both Fulton and DeKalb counties. With a population of 498,715 ...
. The interstate has facilitated the rapid growth of the largest suburban corridor in the
Nashville metropolitan area The Nashville metropolitan area (officially, the Nashville-Davidson–Murfreesboro–Franklin, TN Metropolitan Statistical Area) is a metropolitan statistical area centered on Nashville, Tennessee, the capital and largest city in Tennessee, in the ...
, which runs for more than southeast of the city and is considered the most congested stretch of highway in the state. The stretch through Chattanooga also experiences severe congestion, due to an unusually high volume of truck traffic. The stretch of I-24 across the Cumberland Plateau, commonly known as "
Monteagle Mountain Monteagle Mountain is the local name given to a stretch of Interstate 24 near Monteagle, Tennessee that travels over the Cumberland Plateau. Being part of the plateau, it is not technically a mountain, but appears that way to motorists crossing ...
", is considered one of the most hazardous stretches of highway in the United States, particularly for trucks, due to its steep descents, which measure a maximum of 6%
grade Grade most commonly refers to: * Grade (education), a measurement of a student's performance * Grade, the number of the year a student has reached in a given educational stage * Grade (slope), the steepness of a slope Grade or grading may also ref ...
. As proposed by the
Federal Aid Highway Act of 1956 The Federal-Aid Highway Act of 1956, also known as the National Interstate and Defense Highways Act, was enacted on June 29, 1956, when President Dwight D. Eisenhower signed the bill into law. With an original authorization of $25 billion for ...
, the western terminus of I-24 was originally located in Nashville. Most of the route between Nashville and Chattanooga was constructed in the 1960s, with the final section opening in 1971. After extensive lobbying from local politicians, the Bureau of Public Roads, the predecessor agency to the
Federal Highway Administration The Federal Highway Administration (FHWA) is a division of the United States Department of Transportation that specializes in highway transportation. The agency's major activities are grouped into two programs, the Federal-aid Highway Program a ...
, authorized an extension of I-24 to its present-day western terminus in Pulley's Mill, Illinois, in 1964. As a result, I-24 was the last mainline Interstate Highway in Tennessee and Kentucky to be completed, with the last sections in the two states opening in 1978 and 1980, respectively.


Route description

, - , IL , , - , KY , , - , TN , , - , GA , , - , Total , I-24 runs diagonally from
I-57 Interstate 57 (I-57) is a north–south Interstate Highway in Missouri and Illinois that parallels the old Illinois Central Railroad for much of its route. It runs from Sikeston, Missouri, at I-55 to Chicago, Illinois, at I-94. I-57 ess ...
south of
Marion, Illinois Marion is a city in Williamson and Johnson Counties, Illinois, United States, and is the county seat of Williamson County. The population was 16,855 at the 2020 census. It is part of a dispersed urban area that developed out of the early 20th ...
to
I-75 Interstate 75 (I-75) is a major north–south Interstate Highway in the Great Lakes and Southeastern regions of the United States. As with most Interstates that end in 5, it is a major cross-country, north–south route, traveling from St ...
at
Chattanooga, Tennessee Chattanooga ( ) is a city in and the county seat of Hamilton County, Tennessee, United States. Located along the Tennessee River bordering Georgia, it also extends into Marion County on its western end. With a population of 181,099 in 2020, ...
. In Kentucky, the road passes through
Paducah Paducah ( ) is a home rule-class city in and the county seat of McCracken County, Kentucky. The largest city in the Jackson Purchase region, it is located at the confluence of the Tennessee and the Ohio rivers, halfway between St. Louis, Miss ...
and Eddyville. Its length in Tennessee is longer than the other three states combined. There are two segments that are separated by the segment in Georgia. Through Georgia, it carries the
unsigned Unsigned can refer to: * An unsigned artist is a musical artist or group not attached or signed to a record label ** Unsigned Music Awards, ceremony noting achievements of unsigned artists ** Unsigned band web, online community * Similarly, the c ...
State Route 409 (SR 409) designation for internal
Georgia Department of Transportation The Georgia Department of Transportation (GDOT) is the organization in charge of developing and maintaining all state and federal roadways in the U.S. state of Georgia. In addition to highways, the department also has a limited role in developin ...
(GDOT) purposes.


Illinois

I-24 begins at exit 44 on
I-57 Interstate 57 (I-57) is a north–south Interstate Highway in Missouri and Illinois that parallels the old Illinois Central Railroad for much of its route. It runs from Sikeston, Missouri, at I-55 to Chicago, Illinois, at I-94. I-57 ess ...
in southern Williamson County, near the community of Pulleys Mill. The highway heads southeast into rural Johnson County, bypassing Goreville to the east. It reaches an exit at Tunnel Hill Road, which serves Goreville and Tunnel Hill. The highway continues south to its next exit at U.S. Route 45 (US 45) north of
Vienna en, Viennese , iso_code = AT-9 , registration_plate = W , postal_code_type = Postal code , postal_code = , timezone = CET , utc_offset = +1 , timezone_DST ...
. It reaches its next exit at Illinois Route 146 (IL 146) in eastern Vienna. I-24 heads southeast from Vienna into Massac County. Its first exit in Massac County is at Big Bay Road, which serves the communities of Big Bay and New Columbia. I-24 continues southward, bypassing the community of Round Knob before entering
Metropolis A metropolis () is a large city or conurbation which is a significant economic, political, and cultural center for a country or region, and an important hub for regional or international connections, commerce, and communications. A big c ...
. The highway meets US 45 again in Metropolis and passes west of
Fort Massac State Park Fort Massac (or Fort Massiac) was a French colonial and early National-era fort on the Ohio River in Massac County, Illinois, Massac County, Illinois, United States. Its site was listed on the National Register of Historic Places in 1971. Hist ...
. It leaves Metropolis and crosses the
Interstate 24 Bridge The Interstate 24 Bridge may refer to one of two distinct bridges on Interstate 24. Illinois-Kentucky The Interstate 24 Bridge is a two-span tied arch bridge that carries I-24 across the Ohio River. Built in 1973, it is in length and has two ...
over the
Ohio River The Ohio River is a long river in the United States. It is located at the boundary of the Midwestern and Southern United States, flowing southwesterly from western Pennsylvania to its mouth on the Mississippi River at the southern tip of Illino ...
. After that, it continues into Kentucky.


Kentucky

I-24 enters the
Jackson Purchase The Jackson Purchase, also known as the Purchase Region or simply the Purchase, is a region in the U.S. state of Kentucky bounded by the Mississippi River to the west, the Ohio River to the north, and the Tennessee River to the east. Jackson's ...
region of western Kentucky on a north-south alignment. Immediately within McCracken County, the route begins gradually veering southeast, and enters the western fringes of
Paducah Paducah ( ) is a home rule-class city in and the county seat of McCracken County, Kentucky. The largest city in the Jackson Purchase region, it is located at the confluence of the Tennessee and the Ohio rivers, halfway between St. Louis, Miss ...
a few miles later. The welcome center in Paducah utilizes
Whitehaven Whitehaven is a town and port on the English north west coast and near to the Lake District National Park in Cumbria, England. Historically in Cumberland, it lies by road south-west of Carlisle and to the north of Barrow-in-Furness. It is th ...
, the only historic house in the United States used as a
rest area A rest area is a public facility located next to a large thoroughfare such as a motorway, expressway, or highway, at which drivers and passengers can rest, eat, or refuel without exiting onto secondary roads. Other names include motorway servi ...
. In Paducah, the interstate continues to shift southeast, and has interchanges with
US 60 U.S. Route 60 is a major east–west United States highway, traveling from southwestern Arizona to the Atlantic Ocean coast in Virginia. The highway's eastern terminus is in Virginia Beach, Virginia, where it is known as Pacific Avenue, in the ...
,
US 62 U.S. Route 62 or U.S. Highway 62 (US 62) runs from the Mexican border at El Paso, Texas, to Niagara Falls, New York, near the Canadian border. It is the only east-west United States Numbered Highway that connects Mexico and Canada ...
, and
US 45 U.S. Route 45 (US 45) is a major north-south United States highway and a border-to-border route, from Lake Superior to the Gulf of Mexico. A sign at the highway's northern terminus notes the total distance as . US 45 is notable for incorporatin ...
. Passing through the Hendron and
Farley Farley may refer to: People * Farley (name), a list of people with the given name or surname Places Antarctica * Mount Farley * Farley Massif Australia * Farley, New South Wales * Farley railway station England * Farley, Derbyshire * Farle ...
communities adjacent to Paducah, the highway shifts into a direct east-west alignment several miles later, and has an interchange with
US 68 U.S. Route 68 (US 68) is a United States highway that runs for from northwest Ohio to Western Kentucky. The highway's western terminus is at US 62 in Reidland, Kentucky. Its present northern terminus is at Interstate 75 in Findlay, Ohio, though ...
in Reidland. The route then enters Marshall County, and about later reaches an interchange with
I-69 Interstate 69 (I-69) is an Interstate Highway in the United States currently consisting of 10 unconnected segments with an original continuous segment from Indianapolis, Indiana, northeast to the Canadian border in Port Huron, Michigan, at ...
and a connector road to US 62 and Calvert City to the north. Here, it begins a concurrency with the former. The two interstates then shift northeast and have an interchange with US 62 about later. A short distance later, the interstates cross the
Tennessee River The Tennessee River is the largest tributary of the Ohio River. It is approximately long and is located in the southeastern United States in the Tennessee Valley. The river was once popularly known as the Cherokee River, among other names, ...
onto the
Pennyroyal Plateau The Pennyroyal Plateau or Pennyroyal Region, often spelled Pennyrile, is a large physiographic region of Kentucky that features rolling hills, caves, and karst topography in general. It is named for a wild mint that grows in the area. It is also ca ...
and Livingston County just north of
Kentucky Dam Kentucky Dam is a hydroelectric dam on the Tennessee River on the county line between Livingston and Marshall counties in the U.S. state of Kentucky. The dam is the lowermost of nine dams on the river owned and operated by the Tennessee Valley Auth ...
and its
Kentucky Lake Kentucky Lake is a major navigable reservoir along the Tennessee River in Kentucky and Tennessee. It was created in 1944 by the Tennessee Valley Authority's impounding of the Tennessee River via Kentucky Dam for flood control and hydroelectric p ...
impoundment. The highways then have an interchange with Route 453 north of Lake City and the Land Between the Lakes National Recreation Area. They then cross the
Cumberland River The Cumberland River is a major waterway of the Southern United States. The U.S. Geological Survey. National Hydrography Dataset high-resolution flowline dataThe National Map, accessed June 8, 2011 river drains almost of southern Kentucky and ...
about later into Lyon County a few miles north of Barkley Dam and
Lake Barkley Lake Barkley, a reservoir in Livingston County, Lyon County and Trigg County in Kentucky and extending into Stewart County and Houston County in Tennessee, was impounded by the U.S. Army Corps of Engineers in 1966 upon the completion of Bar ...
. Gradually veering eastward, the two interstates reach US 62 again near Kuttawa and Eddyville. Less than later, I-69 splits off to the northeast at a trumpet interchange, and I-24 passes through Mineral Mound State Park, veering southeast a few miles later. Passing through a mostly wooded area, the interstate crosses Route 93 without an interchange, and then has an interchange with Route 293 near the
Kentucky State Penitentiary The Kentucky State Penitentiary (KSP), also known as the "Castle on the Cumberland," is a maximum security and supermax prison with capacity for 856 prisoners located in Eddyville, Kentucky on Lake Barkley on the Cumberland River, about from ...
. It then crosses an inlet of Lake Barkley a few miles later. Some distance later, the freeway enters a landscape consisting mostly of farmland, and dips briefly into the southern tip of Caldwell County, where it has an interchange with Route 139. The interstate then enters Trigg County, and crosses the Muddy Fork Little River a short distance later. About later, the interstate has an interchange with US 68 and Route 80 between Cadiz and
Hopkinsville Hopkinsville is a home rule-class city in and the county seat of Christian County, Kentucky, United States. The population at the 2010 census was 31,577. History Early years The area of present-day Hopkinsville was initially claimed in 1796 b ...
. The highway then crosses into
Christian County Christian County is the name of several counties in the United States: * Christian County, Illinois * Christian County, Kentucky * Christian County, Missouri Christian County is located in the southwestern part of the U.S. state of Missouri. ...
a few miles later. Passing over the next several miles through additional farmland and bypassing Hopkinsville to the southwest, the interstate reaches the southern terminus of I-169 at a trumpet interchange. About later, the interstate has a partial cloverleaf interchange with US 41 Alternate, which provides access to Hopkinsville to the north and
Fort Campbell Fort Campbell is a United States Army installation located astride the Kentucky–Tennessee border between Hopkinsville, Kentucky and Clarksville, Tennessee (post address is located in Kentucky). Fort Campbell is home to the 101st Airborne Divi ...
and
Clarksville, Tennessee Clarksville is the county seat of Montgomery County, Tennessee, United States. It is the fifth-largest city in the state behind Nashville, Memphis, Knoxville, and Chattanooga. The city had a population of 166,722 as of the 2020 United States ce ...
, to the south. I-24 then crosses into Tennessee about later.


Tennessee


Clarksville and Western Highland Rim

I-24 crosses into Tennessee from Kentucky traveling in a southeasterly-to-northwesterly direction into Montgomery County, and serving as a major means of access to
St. Louis St. Louis () is the second-largest city in Missouri, United States. It sits near the confluence of the Mississippi and the Missouri Rivers. In 2020, the city proper had a population of 301,578, while the bi-state metropolitan area, which e ...
and Chicago to the northwest. Immediately within the eastern outskirts of Clarksville, the fifth-largest city in Tennessee, the interstate reaches an interchange with State Route 48 (SR 48), less than later, which provides access to
Fort Campbell Fort Campbell is a United States Army installation located astride the Kentucky–Tennessee border between Hopkinsville, Kentucky and Clarksville, Tennessee (post address is located in Kentucky). Fort Campbell is home to the 101st Airborne Divi ...
. About later the interstate reaches US 79, which also provides access to Guthrie and Russellville in Kentucky to the northeast. Bypassing Clarksville to the east, the interstate next reaches SR 237. The highway then begins a steep descent, with the westbound lanes utilizing a
truck climbing lane Climbing lanes or crawler lanes are a roadway lane design. They allow slower travel for large vehicles, such as large trucks or semi-trailer trucks, ascending a steep grade. Since climbing uphill is difficult for these vehicles, they can travel in ...
to ascend the grade from the east. It then crosses the Red River before reaching SR 76. Leaving Clarksville, the highway enters a long straight section with several steep grades and crosses into Robertson County a short distance later. Several miles later, the interstate reaches an interchange with SR 49 near Pleasant View and Coopertown, which provides access to Springfield to the northeast and Ashland City to the southwest. The route then descends, utilizing another westbound truck lane, before briefly entering Cheatham County. The interstate then crosses another steep hill over the next several miles, utilizing an eastbound truck lane, before crossing into Davidson County. It then has an interchange with US 431 near the Joelton community, and begins a gradual descent into the
Nashville Basin The Nashville Basin, also known as the Central Basin, is a term often used to describe the area surrounding Murfreesboro, Tennessee, in which Nashville is located. The Central Basin was caused by an uplifting which produced a dome known as the N ...
, containing a westbound truck lane. Passing over the next few miles through dense woodlands, the highway the highway reaches SR 45 (
Old Hickory Boulevard Old Hickory Boulevard is a historic road that encircles Nashville, Tennessee, lying entirely within Davidson County. Originally the road, aided by ferries, formed a nearly unbroken loop around the city. Today, it is interrupted by a lake and se ...
) about later. Over the next beyond this point, the interstate crosses over another steep hill, utilizing truck lanes on both the eastbound and westbound ascent, before reaching Nashville at SR 155 (Briley Parkway).


Nashville metropolitan area

Entering Nashville, I-24 has a
cloverleaf interchange A cloverleaf interchange is a two-level interchange in which all turns are handled by slip roads. To go left (in right-hand traffic; reverse directions in left-driving regions), vehicles first continue as one road passes over or under the ...
with SR-155 (Briley Parkway), a northern
controlled-access A controlled-access highway is a type of highway that has been designed for high-speed vehicular traffic, with all traffic flow—ingress and egress—regulated. Common English terms are freeway, motorway and expressway. Other similar terms i ...
beltway around Nashville. Less than later, the interstate joins a concurrency with
I-65 Interstate 65 (I-65) is a major north–south Interstate Highway in the central United States. As with most primary Interstates ending in 5, it is a major crosscountry, north–south route, connecting between the Great Lakes and the Gulf ...
, where the combined routes carry eight through lanes, and travel due south. About later is an interchange with U.S. Route 41 Alternate (US 41A)/ US 431 (Trinity Lane). About beyond this point, I-65 splits off and I-24 passes along the east side of downtown Nashville, where it reduces to six lanes and has interchanges with US 41, US 431, and US 31E, and passes near Nissan Stadium. The interstate then crosses the
Cumberland River The Cumberland River is a major waterway of the Southern United States. The U.S. Geological Survey. National Hydrography Dataset high-resolution flowline dataThe National Map, accessed June 8, 2011 river drains almost of southern Kentucky and ...
on the Silliman Evans Bridge, and joins in a concurrency with I-40, travelling southeast-to-northwest with eight through lanes. later, I-40 splits off eastwardly, heading toward
Knoxville Knoxville is a city in and the county seat of Knox County in the U.S. state of Tennessee. As of the 2020 United States census, Knoxville's population was 190,740, making it the largest city in the East Tennessee Grand Division and the state's ...
. Located at this interchange is also a partial interchange with US 41/ US 70S. Less than later is an interchange with the eastern terminus of I-440, which is also accessible from I-40 nearby. Between I-40 and I-440, I-24's eastbound lanes are split into two barrier-separated carriageways to prevent weaving of traffic destined from I-40 to I-440. A short distance later is once again an interchange with SR 155 (Briley Parkway/Thompson Lane) near the
Nashville International Airport Nashville International Airport is a public/military airport in the southeastern section of Nashville, Tennessee, United States. Established in 1937, its original name was Berry Field, from which its ICAO and IATA identifiers are derived. The ...
. Beginning at the next exit, SR 255 (Harding Place), the left lanes operate as
HOV lane A high-occupancy vehicle lane (also known as an HOV lane, carpool lane, diamond lane, 2+ lane, and transit lane or T2 or T3 lanes) is a restricted traffic lane reserved for the exclusive use of vehicles with a driver and one or more passengers, i ...
s during rush hour. Over the next few miles, I-24 passes through the
Antioch Antioch on the Orontes (; grc-gre, Ἀντιόχεια ἡ ἐπὶ Ὀρόντου, ''Antiókheia hē epì Oróntou'', Learned ; also Syrian Antioch) grc-koi, Ἀντιόχεια ἡ ἐπὶ Ὀρόντου; or Ἀντιόχεια ἡ ἐπ ...
neighborhood, where it has interchanges with Haywood Lane and SR 254 (Bell Road), and crosses Mill Creek. I-24 then continues through southeast Nashville, reaching interchanges with Hickory Hollow Parkway and SR 171 (Old Hickory Boulevard). Continuing through the southeastern suburbs of Nashville, I-24 crosses into Rutherford County about beyond. Immediately within the city of LaVergne, the interstate has an exit with a connector road to that city. It then enters
Smyrna Smyrna ( ; grc, Σμύρνη, Smýrnē, or , ) was a Greek city located at a strategic point on the Aegean coast of Anatolia. Due to its advantageous port conditions, its ease of defence, and its good inland connections, Smyrna rose to promi ...
where it first has an interchange with SR 266 (Sam Ridley Pkwy.). The interstate then enters a long straightaway, and reaches an interchange with SR 102 (Almaville Road), which also serves Smyrna and the
Nissan Smyrna Assembly Plant The Nissan Smyrna assembly plant is an automobile assembly plant in Smyrna, Tennessee, that began production in 1983 and employs approximately 8,000. The plant has an annual capacity of 640,000 cars, which was the highest in North America in 2017 ...
. Leaving Smyrna, the route enters an unincorporated urban area, before reaching a three-level interchange with I-840, the outer southern beltway around Nashville. I-24 then enters Murfreesboro, the largest suburb of Nashville and sixth-largest city in Tennessee. The interstate first has an interchange with a local thoroughfare(Medical Center Parkway/Fortress Blvd), before reaching SR 96, which also connects to
Franklin Franklin may refer to: People * Franklin (given name) * Franklin (surname) * Franklin (class), a member of a historical English social class Places Australia * Franklin, Tasmania, a township * Division of Franklin, federal electoral d ...
. A short distance later, the interstate crosses the west fork of the
Stones River The Stones River (properly spelled Stone's River) is a major stream of the eastern portion of Tennessee's Nashville Basin region. It is named after explorer and longhunter Uriah Stone, who navigated the river in 1767. Geography and hydrography T ...
, and reaches SR 99 (New Salem Highway). A short distance later, the highway reaches US  231, which also connects to
Lebanon Lebanon ( , ar, لُبْنَان, translit=lubnān, ), officially the Republic of Lebanon () or the Lebanese Republic, is a country in Western Asia. It is located between Syria to the north and east and Israel to the south, while Cyprus li ...
and Shelbyville. Here, the HOV lane restriction terminates, and the interstate reduces from eight to four lanes. Leaving Murfreesboro, the interstate later has an interchange with the
Joe B. Jackson Parkway Joe or JOE may refer to: Arts Film and television * Joe (1970 film), ''Joe'' (1970 film), starring Peter Boyle * Joe (2013 film), ''Joe'' (2013 film), starring Nicolas Cage * Joe (TV series), ''Joe'' (TV series), a British TV series airing from ...
, which serves as an outer beltway around southeast Murfreesboro.


Eastern Nashville Basin and Eastern Highland Rim

Upon leaving Murfreesboro, I-24 enters a rural area, passing through a mix of farmland and woodlands, and maintaining a straight alignment Several miles later, the interstate begins a gradual, largely unnoticeable, ascent out of the Nashville Basin onto the
Eastern Highland Rim The Highland Rim is a geographic term for the area in Tennessee surrounding the Central Basin. Nashville is largely surrounded by higher terrain in all directions. Geologically, the Central Basin is a dome. The Highland Rim is a cuesta surrou ...
. A few miles later, the interstate briefly enters Bedford County, and then has an interchange with SR 64, which connects to Shelbyville, near the Bedford- Coffee County line. I-24 then briefly descends, curves to the south, then the east, before once again resuming its gradual ascent, where it surpasses an elevation of for the first time in Tennessee. Upon reaching the top of the rim several miles later, the interstate has an interchange with US 41. later, the highway enters
Manchester Manchester () is a city in Greater Manchester, England. It had a population of 552,000 in 2021. It is bordered by the Cheshire Plain to the south, the Pennines to the north and east, and the neighbouring city of Salford to the west. The t ...
, where it crosses the
Little Duck River The Little Duck River is a U.S. Geological Survey. National Hydrography Dataset high-resolution flowline dataThe National Map, accessed June 8, 2011 tributary of the Duck River of Tennessee in the United States. Via the Duck, Tennessee, and ...
and then has interchanges with SR 53 and SR 55 in short proximity. A short distance later, the highway reaches an interchange with US 41 once again. Leaving Manchester, the interstate maintains its relatively straight trajectory and passes through the northeastern corner of
Arnold Air Force Base Arnold Air Force Base (Arnold AFB) is a United States Air Force base located in Coffee and Franklin counties, Tennessee, adjacent to the city of Tullahoma. It is named for General Henry "Hap" Arnold, the father of the U.S. Air Force. Ther ...
over a distance of about . The interstate then travels over the next through a wide swath of mostly farmland, before entering Grundy County and reaching an interchange with US 64 and SR 50 near the town of Pelham, where it begins a concurrency with the former route that is largely unsigned. A short distance later, I-24 crosses the Elk River, before reaching the base of the Cumberland Plateau.


Monteagle Mountain and Cumberland Plateau gorge

One of the most hazardous stretches of Interstate Highway in the United States is located where I-24 crosses the Cumberland Plateau on steep grades in Grundy and Marion County near the town of Monteagle, and is commonly known as "
Monteagle Mountain Monteagle Mountain is the local name given to a stretch of Interstate 24 near Monteagle, Tennessee that travels over the Cumberland Plateau. Being part of the plateau, it is not technically a mountain, but appears that way to motorists crossing ...
" or "Monteagle". While all motorists are advised to exercise caution along this stretch, truckers are particularly vexed by Monteagle, and many have died in accidents along this stretch. The eastbound grade is particularly hazardous, with a protracted 4–6% grade over several miles. On this stretch, I-24 is three lanes in each direction, and contains two
runaway truck ramp A runaway truck ramp, runaway truck lane, escape lane, emergency escape ramp, or truck arrester bed is a traffic device that enables vehicles which are having braking problems to safely stop. It is typically a long, sand- or gravel-filled lane co ...
s. Owing to geography, these two ramps are on the left side of the grade. The westbound downgrade of the plateau is also extremely hazardous and contains several sharp curves. Portions of this downgrade also feature offramp approach style lane dividers in order to slow motorists. Throughout the entire stretch across the Cumberland Plateau, the speed limit reduces to a maximum of and for trucks on both downgrades. At top of the Plateau, the interstate surpasses in elevation, has interchanges with US 41A and US 41, respectively, and crosses into
East Tennessee East Tennessee is one of the three Grand Divisions of Tennessee defined in state law. Geographically and socioculturally distinct, it comprises approximately the eastern third of the U.S. state of Tennessee. East Tennessee consists of 33 count ...
at the Grundy-Marion County line. The eastern Monteagle grade also has one of the three widest medians of any Interstate Highway; the others are I-8 through the In-Ko-Pah grade in California and
I-84 Interstate 84 may refer to: * Interstate 84 (Oregon–Utah), passing through Idaho, formerly known as Interstate 80N * Interstate 84 (Pennsylvania–Massachusetts) Interstate 84 (I-84) is an Interstate Highway in the Northeaster ...
through the Cabbage Hill grade east of
Pendleton, Oregon Pendleton is a city and the county seat of Umatilla County, Oregon. The population was 17,107 at the time of the 2020 census, which includes approximately 1,600 people who are incarcerated at Eastern Oregon Correctional Institution. Pendleton ...
. There is more than between the eastbound and westbound lanes at one point. The eastbound lanes descend the hill on one side of Monteagle Mountain as part of the original three-lane (two ascending, one descending) US 64 alignment, while the westbound lanes ascend the other side of the hill on new roadbed built for that purpose. After descending Monteagle, I-24 travels for several miles through a vast flat gorge within the plateau characterized by long straightaways and few curves before reaching an interchange with US 72 near Kimball and South Pittsburg, where US 64 splits off. This exit is the primary means of access to
Huntsville, Alabama Huntsville is a city in Madison County, Limestone County, and Morgan County, Alabama, United States. It is the county seat of Madison County. Located in the Appalachian region of northern Alabama, Huntsville is the most populous city in t ...
, for motorists in East Tennessee. About later, the interstate has an interchange with SR 28 in
Jasper Jasper, an aggregate of microgranular quartz and/or cryptocrystalline chalcedony and other mineral phases,Kostov, R. I. 2010. Review on the mineralogical systematics of jasper and related rocks. – Archaeometry Workshop, 7, 3, 209-213PDF/ref> ...
, and crosses the
Sequatchie River The Sequatchie River is a waterway that drains the Sequatchie Valley, a large valley in the Cumberland Plateau in Tennessee. It empties into the Tennessee River downstream from Chattanooga near the Tennessee-Alabama state line. Hydrography The ...
. Beyond this point, the east and westbound lanes split more than apart over a few miles, encompassing farms, homes, and a few businesses in between. The route then crosses a large mountain ridge, has an interchange with SR 27, and, about later, crosses the
Nickajack Lake Nickajack Lake is the reservoir created by Nickajack Dam as part of the Tennessee Valley Authority. The lake stretches from Nickajack Dam to Chickamauga Dam, passing through the city of Chattanooga. The Tennessee River Gorge, commonly referred ...
impoundment of the
Tennessee River The Tennessee River is the largest tributary of the Ohio River. It is approximately long and is located in the southeastern United States in the Tennessee Valley. The river was once popularly known as the Cherokee River, among other names, ...
. Beyond this point, the highway travels through a narrow gorge over several miles, crossing the Running Water Creek and traveling under its namesake trestle. This stretch is extremely crooked, and can experience potentially strong
crosswind A crosswind is any wind that has a perpendicular component to the line or direction of travel. This affects the aerodynamics of many forms of transport. Moving non-parallel to the wind's direction creates a crosswind component on the object and th ...
. The interstate then enters Hamilton County and
Eastern Time Zone The Eastern Time Zone (ET) is a time zone encompassing part or all of 23 states in the eastern part of the United States, parts of eastern Canada, the state of Quintana Roo in Mexico, Panama, Colombia, mainland Ecuador, Peru, and a small por ...
, and then crosses into Georgia less than later.


Georgia and Chattanooga

In the state of
Georgia Georgia most commonly refers to: * Georgia (country), a country in the Caucasus region of Eurasia * Georgia (U.S. state), a state in the Southeast United States Georgia may also refer to: Places Historical states and entities * Related to the ...
, I-24 travels for in Dade County along the southern flank of Raccoon Mountain. Along this stretch, exits remain numbered according to Tennessee's mileage; however, the roadway mileposts are numbered according to Georgia's mileage. This segment also carries the unsigned SR 409 designation for internal
Georgia Department of Transportation The Georgia Department of Transportation (GDOT) is the organization in charge of developing and maintaining all state and federal roadways in the U.S. state of Georgia. In addition to highways, the department also has a limited role in developin ...
(GDOT) purposes. About after entering the state, the interstate has an interchange with the northern terminus of
I-59 Interstate 59 (I-59) is an Interstate Highway located in the southeastern United States. It is a north–south route that spans from a junction with I-10 and I-12 at Slidell, Louisiana, to a junction with I-24 near Wildwood, Georgia. ...
, which provides access to
Birmingham, Alabama Birmingham ( ) is a city in the north central region of the U.S. state of Alabama. Birmingham is the seat of Jefferson County, Alabama's most populous county. As of the 2021 census estimates, Birmingham had a population of 197,575, down 1% fr ...
, to the south. The route then shifts north, and has an interchange with
Georgia State Route 299 State Route 299 (SR 299) is a short north–south state highway located in the northwestern part of the U.S. state of Georgia. Its route is entirely within Dade County. Route description SR 299 begins at an intersection with US&nb ...
(SR 299) in Wildwood about later before turning back north and reentering Tennessee about later. Upon reentering Tennessee and Hamilton County, I-24 travels through Lookout Valley for several miles, and has an interchange with US 11/US 41/US 72 (Lee Highway) about later near the Tiftonia neighborhood. About later, the interstate curves sharply to the east, traveling on a narrow artificial causeway between the Tennessee River to the north and the northern tip of
Lookout Mountain Lookout Mountain is a mountain ridge located at the northwest corner of the U.S. state of Georgia, the northeast corner of Alabama, and along the southeastern Tennessee state line in Chattanooga. Lookout Mountain was the scene of the 18th-cen ...
to the south. A short distance later, the interstate gradually curves 90 degrees to the north, entering
Chattanooga Chattanooga ( ) is a city in and the county seat of Hamilton County, Tennessee, United States. Located along the Tennessee River bordering Georgia, it also extends into Marion County on its western end. With a population of 181,099 in 2020, ...
. Less than later is a three-way interchange with US 27 (unsigned I-124 northbound) northbound, which provides access to downtown Chattanooga directly to the north. Forming an unsigned concurrency with US 27, the highways sharply curve 90 degrees to the east, before widening to eight lanes. I-24 then briefly dips to the south, where it has a
trumpet interchange In the field of road transport, an interchange (American English) or a grade-separated junction (British English) is a road junction that uses grade separations to allow for the movement of traffic between two or more roadways or highways, using ...
with a connector to SR 8. A short distance later, US 27 splits off to the south at a near-cloverleaf interchange as Rossville Boulevard, where the interstate reduces to six lanes. It then travels through the south side of Chattanooga before reaching a partial interchange with US 41/ US 76. Here I-24 reaches the "Ridge Cut", a stretch where the interstate ascends
Missionary Ridge Missionary Ridge is a geographic feature in Chattanooga, Tennessee, site of the Battle of Missionary Ridge, a battle in the American Civil War, fought on November 25, 1863. Union forces under Maj. Gens. Ulysses S. Grant, William T. Sherman, a ...
on a steep grade, first curving sharply to the north at the bottom of the ascent and then to the east again at the top. This stretch is notorious for severe congestion, and is especially hazardous to truckers. At the top of the Ridge Cut, the interstate enters a straight section and begins a gradual descent over a short distance. Traveling roughly along the boundary between Chattanooga and East Ridge, the interstate has interchanges with multiple local thoroughfares over the next several miles. It then reaches its western terminus with I-75 at a directional-T interchange, known locally as the "I-75/24 Split" or simply "The Split".


History


Planning

The stretch of I-24 between Nashville and Chattanooga was authorized by the
Federal Aid Highway Act of 1956 The Federal-Aid Highway Act of 1956, also known as the National Interstate and Defense Highways Act, was enacted on June 29, 1956, when President Dwight D. Eisenhower signed the bill into law. With an original authorization of $25 billion for ...
, commonly known as the Interstate Highway Act. The numbering was approved by the
American Association of State Highway Transportation Officials The American Association of State Highway and Transportation Officials (AASHTO) is a standards setting body which publishes specifications, test protocols, and guidelines that are used in highway design and construction throughout the United St ...
(AASHTO) on August 14, 1957. In 1957, officials in Tennessee,
Kentucky Kentucky ( , ), officially the Commonwealth of Kentucky, is a state in the Southeastern region of the United States and one of the states of the Upper South. It borders Illinois, Indiana, and Ohio to the north; West Virginia and Virginia to ...
,
Illinois Illinois ( ) is a U.S. state, state in the Midwestern United States, Midwestern United States. Its largest metropolitan areas include the Chicago metropolitan area, and the Metro East section, of Greater St. Louis. Other smaller metropolita ...
, and
Missouri Missouri is a U.S. state, state in the Midwestern United States, Midwestern region of the United States. Ranking List of U.S. states and territories by area, 21st in land area, it is bordered by eight states (tied for the most with Tennessee ...
began an effort to extend I-24 west of its allocated western terminus in Nashville to
St. Louis St. Louis () is the second-largest city in Missouri, United States. It sits near the confluence of the Mississippi and the Missouri Rivers. In 2020, the city proper had a population of 301,578, while the bi-state metropolitan area, which e ...
; however, each of the states had difficulty reaching an agreement on the proposed routing. Eventually, the debate evolved into two proposed alignments for the extension in Tennessee. The first alignment extended I-24 west of Nashville into Kentucky near Clarksville, and the second would have had I-24 run concurrent with I-40 west of Nashville for about to near Dickson, before splitting off to the northwest and crossing the
Kentucky Lake Kentucky Lake is a major navigable reservoir along the Tennessee River in Kentucky and Tennessee. It was created in 1944 by the Tennessee Valley Authority's impounding of the Tennessee River via Kentucky Dam for flood control and hydroelectric p ...
impoundment of the Tennessee River a few miles before entering Kentucky. This latter alignment was favored by many officials in Tennessee and Western Kentucky, but the federal government preferred the former, due to its proximitiy to
Fort Campbell Fort Campbell is a United States Army installation located astride the Kentucky–Tennessee border between Hopkinsville, Kentucky and Clarksville, Tennessee (post address is located in Kentucky). Fort Campbell is home to the 101st Airborne Divi ...
. On September 17, 1963, the governors of the four states in a meeting with President
John F. Kennedy John Fitzgerald Kennedy (May 29, 1917 – November 22, 1963), often referred to by his initials JFK and the nickname Jack, was an American politician who served as the 35th president of the United States from 1961 until his assassination ...
reached an agreement on the alignment, which included the Nashville-to-Clarksville alignment in Tennessee and extended the route's western terminus to
Pulleys Mill, Illinois Pulleys Mill is an unincorporated community in Williamson County, Illinois. It is generally located north of Goreville, near the western terminus of Interstate 24 at Interstate 57 Interstate 57 (I-57) is a north–south Interstate High ...
. The four governors also urged the approval of a new east–west interstate highway to run between
Hayti, Missouri Hayti (pronounced "HAY-tie") is a city in eastern Pemiscot County, Missouri, United States. The population was 2,493 at the 2020 census. History Hayti was platted in 1894, when the railroad was extended to that point. According to one tradition, ...
and
Jackson, Tennessee Jackson is a city in and the county seat of Madison County, Tennessee, United States. Located east of Memphis, Tennessee, Memphis, it is a regional center of trade for West Tennessee. Its total population was 68,205 as of the 2020 United States ...
, incorporating a then-unbuilt bridge across the
Mississippi River The Mississippi River is the second-longest river and chief river of the second-largest drainage system in North America, second only to the Hudson Bay drainage system. From its traditional source of Lake Itasca in northern Minnesota, it f ...
that had been proposed since the early 1940s. On August 18, 1964, the Bureau of Public Roads, the predecessor agency to the
Federal Highway Administration The Federal Highway Administration (FHWA) is a division of the United States Department of Transportation that specializes in highway transportation. The agency's major activities are grouped into two programs, the Federal-aid Highway Program a ...
, approved the I-24 extension; however, they only authorized the westernmost of the route between Missouri and Tennessee, which was designated as
I-155 Interstate 155 is the designation for two Interstate Highways in the United States, both of which are related to Interstate 55: *Interstate 155 (Illinois), a spur to Peoria *Interstate 155 (Missouri–Tennessee) Interstate 155 (I-155) is a ...
and terminates in Dyersburg, Tennessee.


Initial construction

The first contract for the construction of I-24 in Tennessee was awarded on September 18, 1957, for a short segment in Chattanooga. The first section to be completed was the western ascent of Monteagle Mountain, which stretched from US 64 near Pelham to US 41 in Monteagle, and eliminated a stretch of US 41 with several hazardous hairpin curves. Work began in September 1958, and the stretch opened to traffic on February 6, 1962. In Nashville a short segment of the concurrent segment with I-40, located between Fesslers Lane and the eastern interchange with that route, was declared complete on January 11, 1965. The section between the southern interchange with I-65 (then
I-265 Interstate 265 (I-265) is a Interstate Highway partially encircling the Louisville metropolitan area. Starting from I-65 in the southern part of Louisville, it runs through Jefferson County, Kentucky, crosses the Ohio River on the Lewis ...
) and Fesslers Lane was partially opened in late December 1963, and fully opened on April 19, 1965. The Silliman Evans Bridge along this stretch was dedicated on January 14, 1964. On July 27, 1965, the short section between the southern interchange with I-65 (then I-265) and US 431 (Trinity Lane) was opened. The Ridge Cut section in Chattanooga, which spanned between Fourth Avenue and Germantown Road, was dedicated on December 1, 1965. To construct the segment at the foot of Lookout Mountain west of downtown Chattanooga, engineers shifted the river channel to the north in order to avoid impeding the flow. This was accomplished by dredging out the north bank, and filling in along the south bank with approximately 250,000 tons of rock from a nearby quarry. This stretch of I-24, which spanned from US 41 in Lookout Valley to 23rd Street near downtown Chattanooga, was completed on December 16, 1966, at a cost of approximately $15 million (equivalent to $ in ), making it one of the most expensive highway projects, per mile, at the time. I-24 was complete in Marion County to Monteagle Mountain in late 1966 and between US 41 in Manchester and US 64 near Pelham on July 27, 1967. The short segment between SR 27 and SR 156 in Marion County, including the bridge over Nickajack Lake, opened on December 18, 1967. The stretch between US 41 in Lookout Valley and the interchange with I-59 in Dade County, Georgia, was jointly opened to traffic by both states on September 10, 1968, along with the of I-59. In Nashville, the short section between US 431 and the northern interchange with I-65, along with a short stretch of I-65 north of this section, opened to traffic on December 23, 1968. On December 9, 1970, I-24 opened between US 231 in Murfreesboro and SR 64 near Beechgrove. The route was opened between SR 171 in Nashville and US 231 in Murfreesboro on December 31, 1970. The last segment of I-24 between Nashville and Chattanooga, the segment located between SR 64 near Beechgrove and US 41 northwest of Manchester, was opened and dedicated on December 16, 1971.


Western extension

Work began on I-24 from the Kentucky line through Clarksville in 1970, and construction on the entirety of I-24 between Clarksville and Nashville was underway by 1972, with an estimated completion date of late 1974 or early 1975. Construction on this approximately segment, the last segment of mainline Interstate Highway completed in Tennessee, proved to be difficult due to the rugged and hilly terrain. The approximately segment between US 68 in Hopkinsville, Kentucky, and US 79 in Clarksville, Tennessee, was jointly opened to traffic by both states on September 12, 1975. The section between US 79 and SR 49 in Robertson County was completed in September 1976. The last segment of I-24 in Tennessee, between SR 49 and I-65 in Nashville, was opened to traffic on January 5, 1978, more than two years behind schedule. A groundbreaking ceremony for the first stretch of I-24 in Kentucky was held on December 6, 1967, in Lyon County. The section of I-24 in Illinois was authorized for engineering by 1966 and authorized for construction by 1968. The first section of I-24 in Illinois, located between US 45 in Vienna and US 45 in Metropolis, was dedicated and opened by then-Governor Dan Walker on January 15, 1974. On October 18, 1974, the stretch between US 45 in Metropolis and US 60 in Paducah, including the Ohio River bridge, opened to traffic. This was also the first stretch of I-24 to open in Kentucky. The final segment of I-24 in Illinois, located between I-57 and US 45 in Vienna, was dedicated and opened to traffic by Governor Walker on January 24, 1976. In October 1977, the stretch between US 68 in Reidland and US 62 east of Calvert City was completed. The section between US 62 near Calvert City and Route 453, including the Tennessee River Bridge, which had been completed approximately five years prior, was opened to traffic on October 25, 1979. The section between US 60 in Paducah and US 68 in Reidland was opened and dedicated by then-governor
Julian Carroll Julian Morton Carroll (born April 16, 1931) is an American lawyer and politician from the state of Kentucky. A Democrat, he served as the 54th Governor of Kentucky from 1974 to 1979, succeeding Wendell H. Ford, who resigned to accept a seat ...
on December 15, 1978. The stretch between US 62 On December 10, 1979, the stretch between Route 453 and US 60/641 in Eddyville, including the Cumberland River Bridge, was opened. Construction on the bridge began in 1972, but issues caused by unusual rock formations at the site, believed to have been formed by the 1811–1812 New Madrid earthquakes or earlier quakes, delayed completion and resulted in the cost nearly tripling. On March 20, 1980, the stretch in Eddyville between US 62/641 and the Western Kentucky Parkway (now I-69), along with the westernmost of the latter route, was opened. I-24 was completed when the section opened to traffic from what is now I-69 to US 68 east of Cadiz on May 23, 1980.


Major projects and expansions


Monteagle Mountain reconstruction

A project began in April 1985 that extensively straightened and rebuilt the eastbound lanes of I-24 on the eastern downgrade of Monteagle Mountain, and reduced the grade. The project also added left shoulders and an additional runaway truck ramp, the latter of which was not originally planned. This work was completed in 1989, and the lanes were reopened on July 11 of that year in a ceremony officiated by then-governor
Ned McWherter Ned Ray McWherter (October 15, 1930April 4, 2011) was an American businessman and politician who served as the 46th Governor of Tennessee, from 1987 to 1995. Prior to that, he served as Speaker of the Tennessee House of Representatives from 19 ...
. The project experienced many setbacks including geological problems, which caused extensive delays. Originally targeted for completion in December 1987 at a cost of $17 million (equivalent to $ in ), the final cost was $29.5 million (equivalent to $ in ). During this project both directions of traffic were routed to the westbound lanes of I-24, which were separated by a
jersey barrier A Jersey barrier, Jersey wall, or Jersey bump is a modular concrete or plastic barrier employed to separate lanes of traffic. It is designed to minimize vehicle damage in cases of incidental contact while still preventing vehicle crossovers resu ...
, and a temporary runaway truck ramp for eastbound traffic was also provided along this alignment. A truck station to allow for the adjustment of brakes opened in January 1992. After the safety improvements were completed, accidents in the eastbound lanes of this stretch dropped from 54 in 1983 to 3 in 1991.


Nashville

The Silliman Evans Bridge was widened from six to eight lanes in a project that completely closed the northbound span between January 20, 1974, and April 6, 1975, and the southbound span from April 6, 1975, to November 16, 1975. This project also added shoulders to the bridge and removed railings that had been deemed unsafe and were believed to have played a role in multiple fatal accidents on the bridge. In November 1977, TDOT installed a system to detect
tailgating Tailgating is the action of a driver driving behind another vehicle while not leaving sufficient distance to stop without causing a collision if the vehicle in front stops suddenly. The safe distance for following another vehicle varies depend ...
vehicles in the westbound lanes of the concurrent segment with I-40, which consisted of sensors embedded in the roadway connected to overhead warning signs with flashing lights and horns. The system was the first of its kind in the country, but experienced technical problems and was criticized as ineffective, leading to its decommission in July 1980. This segment was widened from six to eight lanes between July 1979 and January 1980 by removing the right shoulders, narrowing the lanes by , and shifting traffic slightly to the left. The stretch between near SR 255 (Harding Place) and near SR 254 (Bell Road) was widened to six lanes between April 1989 and November 1990. Between November 1994 and November 1995, TDOT made safety modifications to I-24 through the eastern terminus with I-440 and the nearby split with I-40, which reconfigured the routes to provide direct access to I-440 westbound from I-40 westbound, splitting I-24's eastbound lanes into two barrier-separated carriageways. The approximately segment between Haywood Lane in Nashville and SR 266 in Smyrna was widened from four to eight lanes between June 1997 and December 1998, installing the first HOV lanes on I-24. The portion between SR 266 and I-840 was widened from four to eight lanes between August 1998 and November 2000. The segment between I-440 and Haywood Lane was widened from three to four lanes in each direction between March 2000 and May 2002 in a project that also improved the interchanges on this segment. Widening of the segment between I-840 and SR 96 began in early 2004 and was completed in the summer of 2005. This project added a new interchange at Medical Center Parkway. A project that widened I-24 from four to eight lanes between SR 96 and US 231, and also added a new interchange with SR 99, began in April 2006 and was completed on January 28, 2008.


Chattanooga

In Chattanooga, the stretch between the bottom of the Ridge Cut and east of the Big Scramble was widened from four to six lanes in the mid to latter 1980s. Between May 1989 and November 1991, the Big Scramble was modified in a project that eliminated left-hand entrance and exit ramps, widened parts of the main carriageway, and converted the westbound lanes of I-24 into the ramp carrying I-24 westbound traffic to US 27 northbound. The original interchange with I-75, which was a simple directional-T design, had repeatedly been ranked as one of the top ten worst freight bottlenecks in the United States by the American Transportation Research Institute, and contained several sharp curves and other safety hazards. In December 2018, a contract was awarded to rebuild the interchange, with preliminary work beginning in May 2019. The project consisted of eliminating left-hand entrance and exit ramps from I-75 onto I-24, straightening curves, widening I-75 to six lanes through the interchange, widening two ramps from I-75 to I-24 to three lanes, replacing two overpass bridges, and construction of a collector-distributor facility that carries traffic directly from US 41 and the Tennessee Welcome Center along I-75 northbound, providing direct access to both I-75 northbound and I-24 westbound. Additional space was also provided to widen the remaining ramps between I-75 and I-24 to three lanes, which will be done in the second phase. The project was completed on August 19, 2021, at a cost of $133.5 million, making it the second-most expensive individual contract in state history at the time. The second phase will widen the adjacent segment of I-24 west of the interchange, and lengthen auxiliary lanes on I-75 about north of the interchange. In preparation for the second phase, the Belvoir Avenue overpass and Germantown Road underpass were replaced between May 2020 and August 2021; the latter replacement utilized
accelerated bridge construction Rapid bridge replacement or accelerated bridge construction (ABC) is a technique that allows bridges to be replaced with minimum disruption to traffic. The replacement bridge is constructed on a site near the bridge to be replaced. When it is comp ...
by shifting I-24 traffic onto the Germantown Road entrance and exit ramp and adjacent frontage roads.


I-24 SMART Corridor

The stretch of I-24 between I-440 (Exit 53) in Nashville and US 231 (Exit 81) in Murfreesboro is currently in the process of being developed into the "I-24 SMART Corridor" in an effort to address congestion and mobility issues. In recent years this stretch of I-24 has become the most congested highway corridor in the state, due to the rapid growth of the region. The project pairs this stretch with the adjacent paralleling stretch of US 41/70S (Murfreesboro Road), and all connecting roads in between. The first phase, which ran from October 2018 to December 2021 included the construction of emergency pull-offs, improvements to multiple entrance and exit ramps, the erection of additional roadside dynamic message signs, and upgrades to traffic signals along the corridor. The second phase, which began in March 2022, includes the erection of 67 overhead gantries with signs between mileposts 53 and 70 that will display recommended variable speed limits and variable lane control signs for each lane. The final phase will include the installation of
ramp meter A ramp meter, ramp signal, or metering light is a device, usually a basic traffic light or a two-section signal light (red and green only, no yellow) together with a signal controller, that regulates the flow of traffic entering freeways accordi ...
s on certain on-ramps and the installation of additional CCTV cameras and DMS boards and ADA improvements along connecting arterials.


Major incidents

On July 27, 1973, a
station wagon A station wagon ( US, also wagon) or estate car ( UK, also estate), is an automotive body-style variant of a sedan/saloon with its roof extended rearward over a shared passenger/cargo volume with access at the back via a third or fifth door ( ...
traveling on the northbound span of the Silliman Evans Bridge in Nashville crashed through the bridge's guardrails, exited the roadway, and landed on the ground about below, killing eight of the nine occupants and injuring the other. The accident was investigated by the
National Transportation Safety Board The National Transportation Safety Board (NTSB) is an independent U.S. government investigative agency responsible for civil transportation accident investigation. In this role, the NTSB investigates and reports on aviation accidents and incid ...
(NTSB), which named a number of unsafe design features of the bridge as contributors to the crash. The report also concluded that the state had been aware of the safety hazards of the bridge's rails prior to the accident, which had played a role in previous fatal accidents on the bridge. This accident was cited as the primary event that led to the widening project on the bridge months later. In 1979, structural problems were discovered on the Ohio River Bridge, including 119 cracks as a result of defective welding in the tie girders. The bridge was closed on August 3, 1979, and remained closed to all traffic through October 1980 and all truck traffic until the summer of 1981. On May 18, 2010, it was announced that a sinkhole was found in the eastbound lanes of I-24 in Grundy County near the exit to US 64/SR 50 (exit 127). TDOT officials stated that the hole was growing and diverted traffic onto the westbound lanes. Following emergency repairs, the highway was reopened several days later.


Future

TDOT and GDOT are jointly making preparations to widen the stretch of I-24 from I-59 to US 27 in Chattanooga to six lanes. This project is expected to be split into three phases, due to its location within two states and the difficulties of expanding the stretch which is located on a narrow artificial causeway between Lookout Mountain and the Tennessee River. This stretch has long experienced severe congestion issues, and is considered a major bottleneck, particularly for trucks. Other stretches of I-24 planned to be widened in the near future include the stretch through Clarksville, the stretch between SR 45 and I-65 northwest of Nashville, and the eastern leg of the downtown loop in Nashville between I-65 and I-40.


Exit list


Related routes


Interstate 124

Interstate 124 (I-124) is an unsigned designation for a short segment of a four-lane controlled-access highway located in
Chattanooga Chattanooga ( ) is a city in and the county seat of Hamilton County, Tennessee, United States. Located along the Tennessee River bordering Georgia, it also extends into Marion County on its western end. With a population of 181,099 in 2020, ...
, Tennessee. During periods where this segment of U.S. Route 27 (US 27) has been signed as I-124, it has served as a
spur route A spur route is a short road forming a branch from a longer, more important road such as a freeway, Interstate Highway, or motorway. A bypass or beltway should not be considered a true spur route as it typically reconnects with another or the s ...
of
I-24 Interstate 24 (I-24) is an Interstate Highway in the Midwestern and Southeastern United States. It runs diagonally from I-57, south of Marion, Illinois, to Chattanooga, Tennessee, at I-75. It travels through Illinois, Kentucky, Tennessee, ...
to downtown Chattanooga. The road segment has not been signed as I-124 since the late 1980s (it is marked on overhead signs and milemarkers as US 27), and the
Tennessee Department of Transportation The Tennessee Department of Transportation (TDOT) is a multimodal agency with statewide responsibilities in roadways, aviation, public transit, waterways, and railroads. The mission of TDOT is to provide a safe and reliable transportation syste ...
official map no longer designates it as I-124, but some DOT publications still make reference to the designation.


Paducah business loop

Interstate 24 Business Loop (I-24 Bus.) is an
business loop A business route (or business loop, business spur, or city route) in the United States is a short special route connected to a ''parent'' numbered highway at its beginning, then routed through the central business district of a nearby city or ...
of I-24 that travels through downtown
Paducah, Kentucky Paducah ( ) is a home rule-class city in and the county seat of McCracken County, Kentucky. The largest city in the Jackson Purchase region, it is located at the confluence of the Tennessee and the Ohio rivers, halfway between St. Louis, Missour ...
, that begins at I-24 and US 60 at exit 4 and ends at I-24 and
Kentucky Route 1954 Kentucky Route 1954 (KY 1954) is a north–south secondary highway located entirely in McCracken County, Kentucky, McCracken County in western Kentucky.DeLorme (2010). ''Kentucky Atlas & Gazetteer'' (Map) (4th ed.). Yarmouth, ME: DeLorme. Page 59. ...
(KY 1954) at exit 11. Originally designated as the I-24 Downtown Loop (I-24 Dwtn.), the route was repurposed as I-24 Bus. in 2002. The highway follows US 60, Business U.S. Route 60 (Bus. US 60), and KY 1954. Major Intersections


See also

* * *


References


External links

*
Illinois Highway Ends: Interstate 24Official State of Tennessee Road Map
{{interstates
Interstate 24 Interstate 24 (I-24) is an Interstate Highway in the Midwestern and Southeastern United States. It runs diagonally from I-57, south of Marion, Illinois, to Chattanooga, Tennessee, at I-75. It travels through Illinois, Kentucky, Tennessee, ...
24 24 Transportation in Williamson County, Illinois Transportation in Johnson County, Illinois Transportation in Massac County, Illinois Transportation in McCracken County, Kentucky Transportation in Marshall County, Kentucky Transportation in Livingston County, Kentucky Transportation in Lyon County, Kentucky Transportation in Caldwell County, Kentucky Transportation in Trigg County, Kentucky Transportation in Christian County, Kentucky Transportation in Montgomery County, Tennessee Transportation in Robertson County, Tennessee Transportation in Cheatham County, Tennessee Transportation in Davidson County, Tennessee Transportation in Rutherford County, Tennessee Transportation in Bedford County, Tennessee Transportation in Coffee County, Tennessee Transportation in Grundy County, Tennessee Transportation in Marion County, Tennessee Transportation in Hamilton County, Tennessee Transportation in Dade County, Georgia 24 24 24