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Road traffic safety

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The safety and security on roads and motorways.


A specific category of three-lane road, consisting of two lanes in one direction and one lane in the other, alternating every few kilometres, and separated usually with a steel cable barrier.

A specific category of one-lane road being built in Denmark and Sweden, consisting of a single two-way lane with extra wide shoulders for pedestrians and cyclists.

A specific type of dual carriageway being built in Ireland, Sweden, and Finland, consisting of two lanes in each direction separated by a steel cable barrier.

A transportation and traffic information telephone hotline in some regions of the United States and Canada that was initially designated for road weather information.

A speed recommendation by a governing body.

An intersection system where traffic approaching it from all directions is required to stop before proceeding through the intersection.

A highway that splits off the mainline and reconnects some distance later.

A medically equipped vehicle which transports patients to treatment facilities, such as hospitals.

A measure of total volume of vehicle traffic on a segment of road for a year divided by 365 days to produce an average.

A high-capacity urban road designed to deliver traffic at the highest possible level of service.

A junction at which two or more roads cross at the same level or grade.

A highway that supplements a major or mainline highway.

A secondary type of road usually found in rural areas.

A method of collecting tolls on highways using toll barriers at regularly spaced intervals on the toll road's mainline, usually charging a flat rate at each barrier.

A human-powered or motor-powered, pedal-driven, single-track vehicle, having two wheels attached to a frame, one behind the other.

A street that allows local vehicle traffic, but is prioritized for bicycles and other non-motorized travel.

  • Bike freeway, cycling superhighway, fast cycle route, or bicycle highway

An informal name for a bicycle path that is meant for long-distance traffic.

A lane restricted to bicycles.

A bar or pole pivoted to block vehicular or pedestrian access through a controlled point.

Round non-reflective raised pavement markers used to mark lanes on roads.

A type of large road, usually running through a city.

A road traffic control measure designed to prevent congestion and gridlock at junctions. The surface of the junction is typically marked with a criss-cross grid of diagonal painted lines (or only two lines crossing each other in the box), and vehicles may not enter the area so marked unless their exit from the junction is clear (or, if turning, to await a gap in the oncoming traffic flow).

A road vehicle designed to carry many passengers.

A lane restricted to buses, and sometimes certain other vehicles such as taxis.

A bus-based public transport system designed to improve capacity and reliability relative to a conventional bus system.

A structure where city or intercity buses stop to pick up and drop off passengers.

A designated place where buses stop for passengers to board or alight from it.

An auxiliary route that passes through the central business district of a city.

A past physical design of road signs in the United States in which retroreflective buttons made of transparent plastic are placed in rows following the contours of sign legend elements, usually painted white, such as letters, numbers, arrows, and borders.

An auxiliary route that relieves congestion along the mainline by routing traffic around a city or congested area. Can also be used to refer to a segment of road built to reroute the mainline away from a city or congested area.

The gradient of the road surface at 90° to the direction of travel; the difference in height between the edge and the crown of the road.

  • Car or or automobile

A wheeled motor vehicle used for transportation.

A width of road on which a vehicle is not restricted by any physical barriers or separation to move laterally. A roadway can comprise one or more carriageways; single carriageways may contain both directions of traffic for the roadway, while multiple carriageways can separate traffic by direction or type.

A retroreflective safety device used in road marking and the first of a range of raised pavement markers.

A lane that allows slower travel for large vehicles, such as large trucks or semi-trailer trucks, ascending a steep grade.

A two-level interchange in which turns are handled by eight total ramp or slip roads, four of which form loops that give the interchange the shape of a cloverleaf from the air. Each ramp allows traffic from one direction of a roadway to access only one direction of the crossroad: e.g. from northbound to eastbound while a separate ramp connects from northbound to westbound. Traffic is fully grade separated; it does not need to stop to make any of the connections between the two roadways.

A low-to-moderate-capacity road which serves to move traffic from local streets to arterial roads.

An instance of one physical road bearing two or more different highway, motorway, or other route numbers.

A system of surcharging users of roads that are subject to congestion.

An auxiliary route that provides a shortcut between two routes or a connection between two routes that otherwise do no connect.

A highway defined in the constitution of the place in which it is located. Only found in Minnesota.

An intersection where vehicles attempting to turn across the opposing direction of traffic (left in right-hand drive jurisdictions; right in left-hand drive jurisdictions) cross before they enter the intersection. No left turn signal in the intersection is then necessary.

The reversal of direction of traffic in a lane, to facilitate emergency evacuations, roadworks, or events.

A city or location posted on a series of traffic signs along a particular stretch of road indicating destinations on that route.

A type of highway which has been designed for high-speed vehicular traffic, with all traffic flow and ingress/egress regulated.

A narrow road in the countryside.

A road in the United States and in the Canadian province of Ontario that is designated and/or maintained by the county highway department.

  • Cul-de-sac, dead end, closed, no through road, no exit, court, or no outlet

A bicycle rider.

A former highway which was removed from the highway system is said to be decommissioned. The term also applies to a designation which was removed from a highway system, such as when the U.S. Route 66 was removed from the United States Numbered Highway System in 1985. The physical roadbed typically remains usable, and it may then receive a different designation as another classification of road.

Road signage that is built by attaching mass-produced sheet-metal characters (and graphics, such as route shields and arrows) to the sign face, through means such as screws or rivets.

A route taking traffic around an area of prohibited or reduced access, such as a construction site.

An interchange between a freeway and a minor road where the off-ramp diverges only slightly from the freeway and runs directly across the minor road at an at-grade intersection, becoming an on-ramp that returns to the freeway in similar fashion.

A type of diamond interchange in which the two directions of traffic on the non-freeway road cross to the opposite side on both sides of the bridge at the freeway.

An official document permitting a specific individual to operate a vehicle.

Regulations that govern the activities of commercial truck drivers, most notably limiting the number of hours a person may drive during the day or week.

A type of private road for local access to one or a small group of structures, and is owned and maintained by an individual or group.

Operating a vehicle while being impaired by alcohol or other drugs.

A class of highway with two carriageways for traffic traveling in opposite directions separated by a median strip or central reservation.

A system of toll collection where a driver attaches a transponder to his or her vehicle or where a camera recognizes the vehicle registration plates. Tolls are charged automatically to the driver, either by prepaid account or by regular billing, when the vehicle passes through a toll booth or gantry.

A controlled-access highway that is raised above grade for its entire length.

A vehicle that is designated and authorized to respond to an emergency in a life-threatening situation.

A number assigned to a road junction, usually an exit from a freeway.

A highway that connects rural or agricultural areas to market towns.

A road vehicle (usually a truck) that functions as a firefighting apparatus.

A local road running parallel to a higher-speed, limited-access road.

A flood plain crossing built at or close to the natural ground level, designed to be submerged under water, but withstand such conditions—typically used when flood frequency or time span is minimal, traffic volumes are low, and the cost of a bridge is uneconomic.

A type of intersection where a road splits.

An overhead support for road signs or electronic toll collection systems.

  • Gore, gore point, gore zone, or merge nose

A triangular piece of land found where roads merge or split.

  • Grade, slope, incline, gradient, pitch or rise

The degree by which a road rises or declines, affected by fills and cuts designed and built to reduce the steepness of a road.

The method of aligning a junction of two or more road axes at different heights (grades) so that they will not disrupt the traffic flow on other transit routes when they cross each other.

An unmetalled road, usually in a rural area.

A form of traffic congestion where "continuous queues of vehicles block an entire network of intersecting streets, bringing traffic in all directions to a complete standstill".

  • Grid plan, grid street plan, or gridiron plan

A type of city plan in which streets run at right angles to each other, forming a grid.

A system designed to keep people or vehicles from (in most cases unintentionally) straying into dangerous or off-limits areas.

  • Hairpin turn, hairpin bend, hairpin corner, or hairpin curve

A bend in a road with a very acute inner angle that resembles a hairpin/bobby pin, making it necessary for an oncoming vehicle to turn almost 180° to continue on the road.

The business of transporting goods by road or rail.

A traffic control device used to stop road traffic and allow pedestrians to cross safely.

A lane reserved for vehicles carrying two or more passengers or other exempted vehicles.

An HOV lane that charges a toll for vehicles that do not meet HOV regulations.

Any public road or other public way on land. It is used for major roads, but also includes other public roads and public tracks.

An altered mental state in which a person can drive a car, truck or other automobile great distances, responding to external events in the expected, safe and correct manner with no recollection of having consciously done so.

A graphical representation of a route number, which serves as navigational aid

A right turn made from the left lane (countries that drive on the left), or a left turn made from the right lane (countries that drive on the right).

A highway in the United States that is a specified route for hurricane evacuation.

A law that allows cyclists to treat a stop sign as a yield sign, and a red light as a stop sign.

A road junction that typically uses grade separation, and one or more ramps, to permit traffic on at least one highway to pass through the junction without directly crossing any other traffic stream.

An at-grade road junction of two or more roads either meeting or crossing.

A modular concrete or plastic barrier employed to separate lanes of traffic.

A type of ramp or slip road where instead of a standard left turn being made from the left lane, left-turning traffic uses a ramp on the right side of the road (in countries that drive on the right).

A location where multiple roads intersect, allowing vehicular traffic to change from one road to another.

Part of a carriageway or roadway that is designated for use by a single line of vehicles, to control and guide drivers and reduce traffic conflicts.

Riding a bicycle or motorcycle between lanes or rows of slow moving or stopped traffic moving in the same direction.

A highway defined by laws passed in a legislature. The numbering of such highways may or may not correspond to the numbers familiar to the posted route number.

An intersection where a railway line crosses a road.

A measurement used to describe the quality of traffic on a highway. Levels range from free flowing traffic to constant traffic jams.

A highway or arterial road for high-speed traffic which has many or most characteristics of a controlled-access highway, including limited or no access to adjacent property, some degree of separation of opposing traffic flow, use of grade separated interchanges to some extent, prohibition of some modes of transport such as bicycles or horses and very few or no intersecting cross-streets. The definitions and degrees of isolation from local traffic allowed varies between countries and regions.

A road that links two conurbations or other major road transport facilities, often added because of increasing road traffic.

An arrangement of roadways within a major highway where long distance traffic can use lanes with fewer interchanges compared to local traffic which use 'local' or 'collector' lanes that have access to all interchanges.

The main carriageway(s) of a particular route, as opposed to entrance/exit ramps or auxiliary routes of that route.

A generic phrase used to denote a primary retail street of a village, town or small city in many parts of the world.

A manual published by the Federal Highway Administration in the United States, or similar manuals published by state departments of transportation, that specifies the standards for traffic signs, highway markings, and traffic signals (collectively "traffic control devices"). The manual includes specifications on typefaces, colors, and shapes of signs, as well as placement of these traffic control devices.

The reserved area that separates opposing lanes of traffic on divided roadways. The reserved area may simply be paved or grass, but can be adapted to other functions, such as decorative landscaping, trees, a median barrier, or railway or streetcar lines.

The process of reducing the number of lanes available to traffic, commonly from two lanes to one.

An at-grade intersection design which replaces each left turn with a right turn followed by a U-turn, or a U-turn followed by a right turn

  • Milestone, mile markers, mileposts or mile post

One of a series of numbered markers placed along a road or boundary at intervals of one mile or occasionally, parts of a mile.

A type of small motorcycle with bicycle pedals, generally having a less stringent licensing requirement than full motorcycles or automobiles.

A two- or three-wheeled motor vehicle.

A bicycle with an attached motor or engine and transmission used either to power the vehicle unassisted, or to assist with pedalling.

A self-propelled vehicle, commonly wheeled, that does not operate on rails.

A bridge that moves to allow passage for boats or barges.

A law which requires motorists to move over and change lanes to give safe clearance to law enforcement officers, firefighters, ambulances, utility workers, and in some cases, tow-truck drivers.

A road that produces a musical tune when driven over.

A road numbered consistently throughout a country. Maintenance of the road may be performed at the national level or it may be devolved to states or provinces or to lower levels of administration. The Interstate Highway System, Trans-Canada Highway, and German autobahns are examples of national highways.

An interchange that does not list any connecting roads or locations on road signs

A pair of parallel, usually one-way streets that carry opposite directions of traffic.

A form of electronic toll collection where tolls are collected at highway speeds without the need for tollbooths.

A bridge, road, railway or similar structure that crosses over another road or railway.

A broad, landscaped highway thoroughfare, particularly a roadway in a park or connecting to a park from which trucks and other heavy vehicles are often excluded.

An interchange that has loop ramps, as in a cloverleaf, but does not have the full set of eight ramps. These use between four and seven ramps and are not full grade-separated; traffic making certain movements between the intersecting roadways must stop.

For the material, see road surface. For the path, see sidewalk.

A person traveling on foot, whether walking or running.

A designated place for pedestrians to cross a road.

A colloquial term for the driving practice of the first left-turning vehicle taking precedence over vehicles going straight through an intersection.

A depression in a road surface, usually asphalt pavement, where traffic has removed broken pieces of the pavement.

A minor road system that is generally not maintained.

For the type of easement, see right-of-way

The traffic principle that establishes who has the right to go first when the intended courses of vehicles or pedestrians intersect.

A road owned and maintained by a private individual, organization, or company rather than by a government.

  • Public transport, public transportation, public transit, mass transit, or transit

A system of transport for passengers by group travel systems available for use by the general public, typically managed on a schedule and operated on established routes.

An intersection between two roads with an additional "quadrant roadway" between two legs of the intersecting roads. Left turns (in right-hand traffic countries) or right turns (in left-hand traffic countries) are made via the quadrant roadway rather than at the main intersection.

A road surface marker used on roads, usually made with plastic, ceramic, thermoplastic paint or occasionally metal, and come in a variety of shapes and colors.

A device that regulates the flow of traffic entering a freeway.

Ranch-to-market road or ranch road

See farm-to-market road

A type of traffic enforcement camera that captures an image of a vehicle which has entered an intersection in spite of the traffic signal indicating red.

  • Rest area, travel plaza, rest stop, or service area

A public facility, located next to a large thoroughfare such as a highway, expressway, or freeway at which drivers and passengers can rest, eat, or refuel without exiting on to secondary roads.

A lane in which traffic may travel in either direction, depending on certain conditions. Typically, it is meant to improve traffic flow during rush hours, by having overhead traffic lights and lighted street signs notify drivers which lanes are open or closed to driving or turning.

A company that matches passengers with vehicles, via websites and mobile apps.

A type of three-way road intersection where turning movements of vehicles are restricted. A RIRO permits only right turns and a LILO permits only left turns. RIRO is typical when vehicles drive on the right, and LILO is usual where vehicles drive on the left.

For the traffic principle, see priority

A type of easement granted or reserved over the land for transportation purposes, this can be for a highway, public footpath, rail transport, canal, as well as electrical transmission lines, oil and gas pipelines.

  • Ring road, beltway, circumferential highway, or orbital

A highway or series of highways that encircle a city or town.

A thoroughfare, route, or way on land between two places that has been paved or otherwise improved to allow travel by foot or some form of conveyance, including a motor vehicle, cart, bicycle, or horse.

  • Road diet, lane reduction, or road rechannelization

A technique in transportation planning whereby the number of travel lanes and/or effective width of the road is reduced in order to achieve systemic improvements.

Direct charges levied for the use of roads, including road tolls, distance or time based fees, congestion charges and charges designed to discourage use of certain classes of vehicle, fuel sources, or more polluting vehicles.

Aggressive or angry behavior exhibited by a driver of a road vehicle.

Durable surface material laid down on an area intended to sustain vehicular or foot traffic.

Mechanical (cat's-eye reflectors), non-mechanical (paint), or temporary devices used on a road surface that convey information to motorists, most commonly to delineate traffic lanes or to promote road safety.

A method of trucking where a tractor pulls two or more trailers.

A type of circular intersection or junction in which road traffic flows almost continuously in one direction around a central island.

A combination of letters and/or numbers that serve to identify a particular road. Route numbers may be assigned randomly or as part of a regional numbering scheme.

  • Rumble strips, sleeper lines, rumple strips, audible lines, the corduroy, or growlers

A road surface mark used to alert inattentive drivers of potential danger, by causing a tactile vibration and audible rumbling transmitted through the wheels into the vehicle interior.

  • Runaway truck ramp, runaway truck lane, escape lane, emergency escape ramp or truck arrester bed

An emergency lane with a sand or gravel-filled bed large enough to accommodate and safely stop large trucks, usually adjacent to a road with a steep down-hill grade.

A part of the day during which traffic congestion on roads is at its highest.

  • Scenic route, tourist road, tourist route, tourist drive, holiday route, theme route, or scenic byway

A specially designated road that travels through an area of natural beauty or cultural interest, or along a historic route.

A vehicle used to transport students to and from school or school-related activities.

A type of three-way road intersection, usually used on high traffic volume roads and dual carriageways. In this type of intersection, one direction of traffic travels straight through without stopping while those wishing to turn onto the side road at the intersection simply bear into a separate lane, which forms one 'wing' of the seagull. Here, they meet the opposite carriageway and the side road. Traffic wishing to turn out of the side road, simply cross the intersecting carriageway and drive up the other 'wing' of the seagull, and merge onto the other carriageway.

A road on which the surface has been permanently sealed by the use of a pavement treatment, such as bitumen.

A vehicle that is capable of sensing its environment and moving safely with little or no human input.

  • Sidewalk, footpath, footway, or pavement

A path along the side of a road.

A reserved lane by the verge of a road or motorway.

The act of deliberately avoiding toll roads by using a toll-free alternate route.

A road with one, two, or more lanes arranged within a roadway or carriageway with no physical separation of opposing flows of traffic.

A variant of the diamond interchange most often used in urban areas where conservation of space is necessitated.

A connector road between the intersecting roads of an interchange.

A nickname sometimes given to a complicated or massively intertwined road traffic interchange that resembles a plate of spaghetti. The term was originally used to refer to the Gravelly Hill Interchange on the M6 in Birmingham.

A prefixed and/or suffixed numbered road in the United States that forms a loop or spur of a more dominant route of the same route number and system.

  • Speed bump, speed hump, speed ramp, speed cushion, or speed table

A family of traffic calming devices that use vertical deflection to slow motor-vehicle traffic in order to improve safety conditions.

Operating a vehicle at a speed higher than the speed limit of a particular road.

The maximum (or minimum in some cases) speed at which road vehicles may travel legally on particular stretches of road.

An highway that branches off of the mainline and goes to an area that is not served by the mainline highway.

A free-flowing, grade-separated junction between two roads, where movements are handled by semi-directional flyovers or under ramps. Vehicles first exit the main carriageway, then complete the turn via a ramp that crosses both highways, eventually merging with the traffic from the opposite side of the interchange.

  • State highway, state road, state route, provincial highway, provincial road, or provincial route

A road numbered or maintained by a state or province.

A road numbered or maintained by a national government, where "state" is used in its sense of a nation (for example, state highways in New Zealand).

A traffic sign designed to notify drivers that they must come to a complete stop and make sure no other road users are coming before proceeding.

A diagram that describes a road and its features along a straight line.

A public thoroughfare in a built environment.

The routing of a railroad track or tramway track running directly along public streets, without any grade separation.

  • Superstreet, restricted crossing U-turn (RCUT), J-turn, or Reduced Conflict Intersection

An at-grade intersection where traffic on the minor road cannot go straight across. Traffic on the minor road wishing to turn left or continue straight must turn right onto the major road, then, a short distance away, use a U-turn (or crossover) lane in the median before either going straight or making a right turn when they intersect the other half of the minor road.

A two-lane surface road built to highway standards, typically including partial control of access, occasional passing lanes and hard shoulders.

When a driver drives behind another vehicle while not leaving sufficient distance to stop without causing a collision if the vehicle in front stops suddenly.

A type of vehicle for hire with a driver, used by a single passenger or small group of passengers, often for a non-shared ride.

A lane allowing cars traveling on one side of a one-way frontage road to U-turn onto the opposite frontage road (typically crossing over or under a freeway or expressway).

A method of turning a vehicle around (making a 180° turn) in close quarters, such as in the middle of a road at a point other than an intersection.

  • Three-way junction, 3-way junction, 3-way intersection, Y junction, Y intersection, T junction, or T intersection

a type of road intersection with three arms. A Y junction generally has 3 arms of equal size. A T junction also has 3 arms, but one of the arms is generally a minor road connecting to larger road.

Road users passing through an area who's destination is elsewhere.

A toll road where motorists pay a toll rate based on the distance traveled from their origin to their destination exit. Motorists take a ticket when entering the road and pay the toll and surrender the ticket upon exiting.

A road for which a fee (or toll) is assessed for passage.

Pedestrians, ridden or herded animals, vehicles, streetcars, buses and other conveyances, either singly or together, that use roads for purposes of travel.

A localized disruption of vehicular traffic on a road.

Occurs when a vehicle collides with another vehicle, pedestrian, animal, road debris, or other stationary obstruction.

A cone-shaped marker that is placed on roads or footpaths to temporarily redirect traffic in a safe manner.

Condition involving slower speeds and longer trip times.

A solid or painted object in a road that channelises traffic.

Signaling devices positioned at road intersections, pedestrian crossings and other locations to control competing flows of traffic.

A method of conveying information to people who are using a road. Depending on location, the main color of the sign can tell the motorist what type of information is presented on the sign.

  • Tram, trolley, or streetcar

A rail vehicle that runs on tramway tracks along public urban streets.

A vehicle designed to carry cargo.

A person who earns a living by driving a truck.

A bypass designed for heavy truck traffic.

An interchange commonly used where one highway terminates at another highway; resembles the bell of a trumpet.

A type of junction that allows traffic traveling in one direction on a road to efficiently make a U-turn typically without backing up or making dangerous maneuvers in the middle of the traffic stream.

When a motorist must exit a highway to continue traveling on the same numbered route.

A principle of law permitting vehicles at a traffic light showing a red signal to turn into the direction of traffic nearer to them (almost always after a complete stop) when the way is clear, without having to wait for a green signal.

An expressway with only one lane in each direction, and usually no median barrier.

A single carriageway with one lane for each direction.

A bridge, road, railway or similar structure that crosses under another road or railway.

A highway that has been assigned a route number, but does not bear road markings that would conventionally be used to identify the route with that number.

A highway or highway ramp that was partially or fully constructed, but was unused or later closed.

A 180° rotation to reverse the direction of travel so called because the maneuver looks like the letter U.

A traffic sign that can display important messages about special events to motorists. Commute times, weather alerts, AMBER alerts, and advanced notices of road construction or accidents are common messages.

A machine that transports people or cargo.

A vehicle providing shared transport, which transports one or more passengers between locations of the passengers' choice.

A metal or plastic plate attached to a motor vehicle or trailer for official identification purposes.

A multilateral treaty designed to increase road safety and aid international road traffic by standardizing the signing system for road traffic (road signs, traffic lights and road markings) in use internationally.

An international treaty designed to facilitate international road traffic and to increase road safety by establishing standard traffic rules among the contracting parties.

Weaving typically occurs at interchanges. Cloverleaf interchanges are especially prone to weaving when an entering vehicle tries to merge into a traffic lane while another vehicle is attempting to exit from the same lane. Weaving also occurs when vehicles enter traffic from inner lanes and must quickly exit from outer lanes.

A checkpoint along a highway to inspect vehicular weights. Usually, trucks and commercial vehicles are subject to the inspection.

A concurrency between two roads with opposite signed directions, e.g. a westbound highway and an eastbound highway. Often, the physical roadbed is actually headed in a totally different cardinal direction.

An abbreviation for road crossing, primarily used in North America

Occurs at a traffic light when oncoming traffic has an extended green period.

A traffic sign used to indicate that each driver must prepare to stop if necessary to let a driver on another approach proceed.

A pedestrian crossing marked by alternating dark and light stripes, which typically gives extra rights of way to pedestrians.

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