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A split intersection is a rarely built at-grade variant of the
A town center intersection (TCI) is similar to a split intersection; however, both the arterial road and the crossroad are split into separated one-way streets. The resulting grid, most often implemented in a city, reduces conflicts to two directions per intersection.
The TCI's grade-separated variant is the
Simulation of the Split Intersection
ATTAP,
Animation of a town center intersection
{{Road junction types Road junction types
A split intersection is a rarely built at-grade variant of the diamond interchange
A diamond interchange is a common type of road junction, used where a controlled-access highway crosses a minor road.
Design
The freeway itself is grade-separated from the minor road, one crossing the other over a bridge. Approaching the ...
. Compared to a conventional four-leg intersection or road crossing, the arterial road is split into separate carriageway
A carriageway (British English) or roadway (North American English) consists of a width of road on which a vehicle is not restricted by any physical barriers or separation to move laterally. A carriageway generally consists of a number of tra ...
s by , allowing a queue of left turning vehicles behind a completed turn into the crossroad without any conflict to oncoming traffic. On the crossroad, the four leg intersection is being replaced by two intersections. The beginning one-way traffic
One-way traffic (or uni-directional traffic) is traffic that moves in a single direction. A one-way street is a street either facilitating only one-way traffic, or designed to direct vehicles to move in one direction. One-way streets typical ...
at the fourth leg makes the intersections reduce the number of conflicts similar to a three leg T-intersection to improve traffic flow
In mathematics and transportation engineering, traffic flow is the study of interactions between travellers (including pedestrians, cyclists, drivers, and their vehicles) and infrastructure (including highways, signage, and traffic control dev ...
.
Existing examples
* At Legacy Drive and Preston Road,Plano, Texas
Plano ( ) is a city in Collin County and Denton County, Texas, United States. It had a population of 285,494 at the 2020 census. It is a principal city of the Dallas–Fort Worth metroplex.
History
European settlers came to the area near ...
, with Texas U-turn lanes,
* At New Dallas Highway (US-77
U.S. Route 77 (US 77) is a major north–south United States Numbered Highway which extends for in the central United States. As of 2005, Its southern terminus is in Brownsville, Texas, at Veteran's International Bridge on the Mexican border, wh ...
) and E. Industrial Boulevard TX-340 in Lacy Lakeview, Texas,
* At Stock Road and Winterfold Road in Perth, Australia
Perth is the capital and largest city of the Australian state of Western Australia. It is the fourth most populous city in Australia and Oceania, with a population of 2.1 million (80% of the state) living in Greater Perth in 2020. Perth ...
* It is the most common intersection design on Utah State Route 85
The Mountain View Corridor is a freeway under construction in northern Utah that will run along the western periphery of Salt Lake County and south into northwest Utah County. Except for the last several miles on its southern end the Mountain ...
, also called Mountain View Corridor. They are planned to be later converted, mostly into diamond interchanges, by adding a bridge in the middle.
* At Sarcee Trail
Sarcee Trail is a major limited-access road in Calgary, Alberta. It is divided into two portions, one in the south end of the city, and one in the north end of the city. Originally planned as one continuous route, plans to connect the two halves ...
and Richmond Road, Calgary
Calgary ( ) is the largest city in the western Canadian province of Alberta and the largest metro area of the three Prairie Provinces. As of 2021, the city proper had a population of 1,306,784 and a metropolitan population of 1,481,806, maki ...
, Alberta, Canada,
* Four intersections along Terwillegar Drive
Terwillegar Drive is a developing freeway in south-west Edmonton, Alberta. It is under construction, with the majority of its intersection at-grade, it retains its arterial road status. Once completed, it will be the third freeway in Edmonton not ...
in Edmonton
Edmonton ( ) is the capital city of the Canadian province of Alberta. Edmonton is situated on the North Saskatchewan River and is the centre of the Edmonton Metropolitan Region, which is surrounded by Alberta's central region. The city an ...
, Alberta, Canada
*Four intersections along Manning Drive
Alberta Provincial Highway No. 15, commonly referred to as Highway 15 or Manning Drive, is a highway in the Edmonton Region of Alberta, connecting northeast Edmonton to the City of Fort Saskatchewan and communities within Lamon ...
in Edmonton, Alberta, Canada
* Lake Woodlands Drive at Grogans Mill Road in The Woodlands, Texas
Texas (, ; Spanish: ''Texas'', ''Tejas'') is a state in the South Central region of the United States. At 268,596 square miles (695,662 km2), and with more than 29.1 million residents in 2020, it is the second-largest U.S. state by ...
;
Town center intersection
A town center intersection (TCI) is similar to a split intersection; however, both the arterial road and the crossroad are split into separated one-way streets. The resulting grid, most often implemented in a city, reduces conflicts to two directions per intersection.
The TCI's grade-separated variant is the three-level diamond interchange
A three-level diamond interchange is a type of highway interchange where through traffic on both main roads is grade-separated from intersections which handle transferring traffic. It is similar in design to a three-level stacked roundabout exc ...
.
Examples
* Grogans Mill Road at Research Forest Drive in The Woodlands,Texas
Texas (, ; Spanish: ''Texas'', ''Tejas'') is a state in the South Central region of the United States. At 268,596 square miles (695,662 km2), and with more than 29.1 million residents in 2020, it is the second-largest U.S. state by ...
;
* Springwoods Village Parkway at Holzwarth Road in Spring
Spring(s) may refer to:
Common uses
* Spring (season), a season of the year
* Spring (device), a mechanical device that stores energy
* Spring (hydrology), a natural source of water
* Spring (mathematics), a geometric surface in the shape of a h ...
, Texas
Texas (, ; Spanish: ''Texas'', ''Tejas'') is a state in the South Central region of the United States. At 268,596 square miles (695,662 km2), and with more than 29.1 million residents in 2020, it is the second-largest U.S. state by ...
;
* San Elijo Road at Elfin Forest Road in San Marcos, California
California is a state in the Western United States, located along the Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the most populous U.S. state and the 3rd largest by area. It is also the m ...
;
*170 Street and Stony Plain Road and 100 Ave in Edmonton, Alberta.
See also
*Offset T-intersection
An offset T-intersection is an at-grade road intersection where a conventional four leg intersection is split into two three-leg T-intersections to reduce the number of conflicts and improve traffic flow. Building the offset T-intersections as co ...
* Hamburger intersection
A roundabout is a type of circular intersection or junction in which road traffic is permitted to flow in one direction around a central island, and priority is typically given to traffic already in the junction.''The New Shorter Oxford Eng ...
( Throughabout)
References
Further reading
Simulation of the Split Intersection
ATTAP,
University of Maryland
The University of Maryland, College Park (University of Maryland, UMD, or simply Maryland) is a public land-grant research university in College Park, Maryland. Founded in 1856, UMD is the flagship institution of the University System of ...
, 11 November 2015
External links
Animation of a town center intersection
{{Road junction types Road junction types