Traffic Law In The United States
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driving in the United States Driving in the United States is a frequent occurrence. 86percent of Americans use private automobiles as their primary form of transportation to their workplace. Each state has the authority to set its own traffic laws and issue driving licen ...
, each state and territory has its own
traffic code Traffic codes are laws that generally include provisions relating to the establishment of authority and enforcement procedures, statement of the Traffic#Rules of the road, rules of the road, and other safety provisions. Administrative regulations ...
or rules of the road, although most of the rules of the road are similar for the purpose of uniformity, given that all states grant reciprocal driving privileges (and
penalties Penalty or The Penalty may refer to: Sports * Penalty (golf) * Penalty (gridiron football) * Penalty (ice hockey) * Penalty (rugby) * Penalty (rugby union) * Penalty kick (association football) * Penalty shoot-out (association football) * Penalty ...
) to each other's licensed drivers. There is also a "Uniform Vehicle Code" which was proposed by a private, non-profit group, based upon input by its members. The UVC was not adopted in its entirety by any state. As with
uniform act In the United States, a uniform act is a proposed state law drafted and approved by the Uniform Law Commission (ULC), also known as the National Conference of Commissioners on Uniform State Laws (NCCUSL). Federalism in the United States traditi ...
s in general, some states adopted selected sections as written or with modifications, while others created their own ''
sui generis ''Sui generis'' ( , ) is a Latin phrase that means "of its/their own kind", "in a class by itself", therefore "unique". A number of disciplines use the term to refer to unique entities. These include: * Biology, for species that do not fit in ...
'' statutes touching upon the same subject matter. As required by the federal Highway Safety Act of 1966, all states and territories have adopted substantially similar standards for the vast majority of signs,
signals In signal processing, a signal is a function that conveys information about a phenomenon. Any quantity that can vary over space or time can be used as a signal to share messages between observers. The ''IEEE Transactions on Signal Processing'' ...
, and
road surface marking Road surface marking is any kind of device or material that is used on a road surface in order to convey official information; they are commonly placed with road marking machines (also referred to as road marking equipment or pavement marking eq ...
s, based upon the
Manual on Uniform Traffic Control Devices The ''Manual on Uniform Traffic Control Devices for Streets and Highways'' (usually referred to as the ''Manual on Uniform Traffic Control Devices'', abbreviated MUTCD) is a document issued by the Federal Highway Administration (FHWA) of the Unit ...
from the U.S. Department of Transportation. Many of the standard rules of the road involve consistent interpretation of the standard signs, signals, and markings such as what to do when approaching a stop sign, or the driving requirements imposed by a
double yellow line Yellow lines are road markings used in various territories. Single yellow lines Parking restrictions UK & Ireland A single yellow line is a road marking that is present on the side of the carriageway across the British Isles. In the Unite ...
on the street or highway. Many agencies of the federal government have also adopted their own traffic codes for enforcement on the grounds of their respective facilities (e.g., national parks, military bases).


Standard rules

List of some standard rules of the road: *Entering and leaving roadways. *
Right of way Right of way is the legal right, established by grant from a landowner or long usage (i.e. by prescription), to pass along a specific route through property belonging to another. A similar ''right of access'' also exists on land held by a gov ...
at marked and unmarked intersections under various conditions. *Observing and interpreting
traffic sign Traffic signs or road signs are signs erected at the side of or above roads to give instructions or provide information to road users. The earliest signs were simple wooden or stone milestones. Later, signs with directional arms were introduce ...
s (especially warning, priority or
prohibitory traffic sign Prohibitory traffic signs are used to prohibit certain types of manoeuvres or some types of traffic. Modern prohibitory traffic signs No entry No admittance to unauthorised personnel, usually shown as a red circle with a white rectangle across ...
s) *Keeping to right side (or left side) except to pass others, where passing is allowed. *Direction of travel and turning (one way, do not enter, no
U-turn A U-turn in driving refers to performing a 180° rotation to reverse the direction of travel. It is called a "U-turn" because the maneuver looks like the letter U. In some areas, the maneuver is illegal, while in others, it is treated as a m ...
, etc.) *Speed, height, width and weight limits. *Bicycle and pedestrian priority. *Yielding to special vehicles (emergency, funeral, school bus). *Vehicle
lighting Lighting or illumination is the deliberate use of light to achieve practical or aesthetic effects. Lighting includes the use of both artificial light sources like lamps and light fixtures, as well as natural illumination by capturing daylig ...
and
signalling In signal processing, a signal is a function that conveys information about a phenomenon. Any quantity that can vary over space or time can be used as a signal to share messages between observers. The ''IEEE Transactions on Signal Processing'' ...
. *Stopping if there has been a
collision In physics, a collision is any event in which two or more bodies exert forces on each other in a relatively short time. Although the most common use of the word ''collision'' refers to incidents in which two or more objects collide with great fo ...
. Georgia’s new law which took effect from July 1, 2018, prohibits the drivers from holding any devices (
Mobile phones A mobile phone, cellular phone, cell phone, cellphone, handphone, hand phone or pocket phone, sometimes shortened to simply mobile, cell, or just phone, is a portable telephone that can make and receive calls over a radio frequency link whil ...
or any
electronic devices The field of electronics is a branch of physics and electrical engineering that deals with the emission, behaviour and effects of electrons using Electronic component, electronic devices. Electronics uses Passivity (engineering), active devices ...
) in hand while driving. Traffic is required to keep to the right, known as a
right-hand traffic Left-hand traffic (LHT) and right-hand traffic (RHT) are the practices, in bidirectional traffic, of keeping to the left side or to the right side of the road, respectively. They are fundamental to traffic flow, and are sometimes referred to ...
pattern. The exception is the
US Virgin Islands The United States Virgin Islands,. Also called the ''American Virgin Islands'' and the ''U.S. Virgin Islands''. officially the Virgin Islands of the United States, are a group of Caribbean islands and an unincorporated and organized territory ...
, where people drive on the left. Most states in the United States enforce
priority to the right Priority to the right is a right-of-way system, in which the driver of a vehicle is required to give way to vehicles approaching from the right at intersections. The system is stipulated in Article 18.4.a of the Vienna Convention on Road Traffic fo ...
at uncontrolled intersections, where motorists must yield to the right. The two most important differences between U.S. traffic rules and foreign countries' traffic rules are as follows: * Very heavy use of fully-signed, mandatory 4-way stop signs at intersections (rather than 2-way stops, yields, or roundabouts as in other countries) with priority to the first vehicle (priority to the right if two arrive at the exact same time) * Traffic lights are normally positioned after the intersection, on the far side from approaching traffic, rather than before


Speed limits

Speed limits Speed limits on road traffic, as used in most countries, set the legal maximum speed at which vehicles may travel on a given stretch of road. Speed limits are generally indicated on a traffic sign reflecting the maximum permitted speed - expres ...
are set by each state or territory, as well as counties or municipalities, on the roads within their jurisdiction. The maximum speed limit on rural two-lane roads ranges from 50 mph (80 km/h) in parts of the northeast to 75 mph (120 km/h) in parts of
Texas Texas (, ; Spanish language, Spanish: ''Texas'', ''Tejas'') is a state in the South Central United States, South Central region of the United States. At 268,596 square miles (695,662 km2), and with more than 29.1 million residents in 2 ...
. On rural
Interstate Highways 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 ...
and other
freeways 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 ...
, the speed limit ranges from 60 mph (96 km/h) in Hawaii to 85 mph (136 km/h) in parts of
Texas Texas (, ; Spanish language, Spanish: ''Texas'', ''Tejas'') is a state in the South Central United States, South Central region of the United States. At 268,596 square miles (695,662 km2), and with more than 29.1 million residents in 2 ...
. All roads in the United States have a speed limit, but it is not always posted (especially in rural areas).


Lane discipline and overtaking

Overtaking Overtaking or passing is the act of one vehicle going past another slower moving vehicle, travelling in the same direction, on a road. The lane used for overtaking another vehicle is often a passing lane farther from the road shoulder which i ...
, usually called "passing", is legal on all four or more lane roads and on most two-lane roads with sufficient sight distance. On two-lane roads, one must pass to the left of the overtaken vehicle unless that vehicle is preparing to make a left turn, in which case the vehicle must be passed on the right. Passing on the left means that the overtaking vehicle must enter the oncoming lane. This should only be done in a legal passing zone, designated by either a dashed yellow center-line (indicating that passing is legal in both directions) or a solid line paired with a dashed line (indicating that passing is only legal for traffic adjacent to the broken line). A solid double yellow line indicated that passing is illegal in both directions. In some states, it is not against the law to overtake vehicles in the presence of solid yellow lines if it is safe to do so. For example,
Vermont Vermont () is a state in the northeast New England region of the United States. Vermont is bordered by the states of Massachusetts to the south, New Hampshire to the east, and New York to the west, and the Canadian province of Quebec to ...
state law also allows passing across the double yellow line when no traffic is on the opposing side; however, one must pass quickly and return to the proper side. However, this is unusual as most states have a ban on crossing a double yellow line except when turning, or when pedestrians, bicycles, or other obstructions in the road make it necessary. Overtaking another vehicle across a solid yellow line is usually considered a serious traffic violation in most states. On roads with four or more lanes (including divided highways), vehicles may pass to the left or to the right of slower vehicles as long as the maneuver can be completed safely. However, most states either suggest or require that through traffic stay to the right except to pass. The
Manual on Uniform Traffic Control Devices The ''Manual on Uniform Traffic Control Devices for Streets and Highways'' (usually referred to as the ''Manual on Uniform Traffic Control Devices'', abbreviated MUTCD) is a document issued by the Federal Highway Administration (FHWA) of the Unit ...
includes several signage standards to inform drivers of proper lane discipline, including the "STAY RIGHT PASS LEFT" and "SLOWER TRAFFIC KEEP RIGHT" signs.


Seat belt use

49 states, the
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and the five inhabited territories have passed laws requiring seat belt use by at least all occupants of the front seat. New Hampshire is the only state with no such requirement for adults (anyone under eighteen must use a seat belt). Some states also require rear seat occupants to wear seat belts. In 24 states, the seat belt law is considered to be only a ''secondary offense'', meaning that a police officer can only ticket a person for violating the seat belt law if the driver has already been stopped for another reason. The effectiveness of seat belt laws varies considerably throughout the country, with some areas observing over 95% usage and others with less than 40% usage.


Road signs

In the United States,
road signs Traffic signs or road signs are signs erected at the side of or above roads to give instructions or provide information to road users. The earliest signs were simple wooden or stone milestones. Later, signs with directional arms were introduce ...
are, for the most part, standardized by federal regulations, most notably in the ''
Manual on Uniform Traffic Control Devices The ''Manual on Uniform Traffic Control Devices for Streets and Highways'' (usually referred to as the ''Manual on Uniform Traffic Control Devices'', abbreviated MUTCD) is a document issued by the Federal Highway Administration (FHWA) of the Unit ...
'' (MUTCD) and its companion volume the ''Standard Highway Signs'' (SHS). Under a federal regulation promulgated by 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 ...
pursuant to the Highway Safety Act, states must remain in "substantial conformance" with the MUTCD. This standard does not require states to precisely conform to the MUTCD, which allows for a degree of local variation in certain minor aspects of road signs and markings.


Uniform Vehicle Code

The Uniform Vehicle Code (UVC) is a
model act A model act, also called a model law or a piece of model legislation, is a suggested example for a law, drafted centrally to be disseminated and suggested for enactment in multiple independent legislatures. The motivation classically has been the ...
by the National Committee on Uniform Traffic Laws and Ordinances, a private
non-profit organization A nonprofit organization (NPO) or non-profit organisation, also known as a non-business entity, not-for-profit organization, or nonprofit institution, is a legal entity organized and operated for a collective, public or social benefit, in co ...
. Most of the members are
state governments A state government is the government that controls a subdivision of a country in a federal form of government, which shares political power with the federal or national government. A state government may have some level of political autonomy, or ...
, in addition to some related organizations. The extent to which the code is used varies by each
state State may refer to: Arts, entertainment, and media Literature * ''State Magazine'', a monthly magazine published by the U.S. Department of State * ''The State'' (newspaper), a daily newspaper in Columbia, South Carolina, United States * ''Our S ...
,
territory A territory is an area of land, sea, or space, particularly belonging or connected to a country, person, or animal. In international politics, a territory is usually either the total area from which a state may extract power resources or a ...
, and
Native American tribe In the United States, an American Indian tribe, Native American tribe, Alaska Native village, tribal nation, or similar concept is any extant or historical clan, tribe, band, nation, or other group or community of Native Americans in the Unit ...
. It was last updated in 2000. Although the UVC was broadly influential, virtually all American jurisdictions extensively rearranged, renumbered, and rewrote various UVC sections in the process of enacting them. One example of the resulting complexity is that in 1979, the NCUTLO needed 262 pages just to explain all state-by-state variations of each section of UVC Chapter 11, Rules of the Road. Some time not long after the release of the 2000 edition, " heNCUTLO went into hiatus because of a lack of funding. The primary problem was that the Internet provided, at no cost, much of the information that was previously easily available only from the committee for the cost of an annual membership." It has since ceased operations. In the absence of NCUTLO, the NCUTCD (the NCUTLO's counterpart in the development of the
Manual on Uniform Traffic Control Devices The ''Manual on Uniform Traffic Control Devices for Streets and Highways'' (usually referred to as the ''Manual on Uniform Traffic Control Devices'', abbreviated MUTCD) is a document issued by the Federal Highway Administration (FHWA) of the Unit ...
) has appointed a task force to review potentially outdated portions of the most recent edition of the UVC, and to propose updated language. The last update was issued in 2015. 2015 Draft of Updates to Uniform Vehicle Code, NCUTCD official website
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International standards

The United States was one of the original signatories on September 19, 1949, to the
Geneva Convention on Road Traffic The Convention on Road Traffic, commonly known as the Geneva Convention on Road Traffic, is an international treaty promoting the development and safety of international road traffic by establishing certain uniform rules among the contracting pa ...
, which came into effect in the United States on August 30, 1950. However, the United States has not signed or ratified subsequent treaties like the
Vienna Convention on Road Traffic The Convention on Road Traffic, commonly known as the Vienna Convention on Road Traffic, is an international treaty designed to facilitate international road traffic and to increase road safety by establishing standard traffic rules among the co ...
.


See also

*
Driving in the United States Driving in the United States is a frequent occurrence. 86percent of Americans use private automobiles as their primary form of transportation to their workplace. Each state has the authority to set its own traffic laws and issue driving licen ...


References


External links

* Official website of {{webarchive , url=https://web.archive.org/web/*/http://www.ncutlo.org/ , date=* , title=National Committee on Uniform Traffic Laws and Ordinances
2000 Edition of the Uniform Vehicle Code
Uniform Acts Traffic law Rules of the road