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Signs, signals, markings, and other devices used to regulate, warn, or guide traffic.

A design strategy to reduce the number of lanes on a roadway to improve safety and provide more space for other modes of transportation like walking, cycling, and buses.

The total weight force transmitted by all the wheels of a vehicle to the roadway surface.

The process of estimating the number of trips originated or destined for a particular area.

The maximum number of vehicles that can pass a point on a roadway during a given time period under optimal conditions, usually expressed as vehicles per hour.

A set of roadway design techniques aimed at slowing down or reducing traffic as well as improving safety for pedestrians and cyclists.

Strategies employed to redirect traffic flow from one route to another, often used during construction or incidents.

A qualitative measure describing operational conditions within a traffic stream, and the perception of those conditions to motorists and passengers.

A street space design concept where all modes of transportation, including pedestrians, cyclists, and vehicles, share the roadway without traditional traffic control devices.

The movement of vehicles along a roadway.

The total number of vehicles lined up behind a stoppage or a traffic signal.

The use of computer software to create a model of a transportation system in order to study and predict traffic behavior.

The variation in vehicular speeds across a traffic stream.

A series of traffic signals coordinated to allow continuous traffic flow over several intersections at a specified speed.

A study that collects and analyzes data on the travel patterns of vehicles or people within a specified area.

The part of the day during which traffic congestion on roads and crowding on public transport is at its highest.

The sequence of signal indications assigned to different movements of traffic at an intersection.

An intersection where traffic is regulated by stop signs on entering roads to control the flow and order of traffic.

The programming of traffic signals to provide optimal movement of traffic, typically including green, yellow, and red phases.

A device positioned at road intersections and pedestrian crossings to control vehicle and pedestrian flows.

The percentage division of the number of trips by different modes of transportation, e.g., car, bus, bike etc.

A condition characterized by slower speeds, longer trip times, and increased vehicular queuing.

The maximum number of vehicles that can pass through an intersection or a point during green signal phase, typically expressed in vehicles per hour green time.

A raised or painted section of a roadway designed to direct traffic or provide pedestrian safety.

A section of a roadway network that experiences a reduction in capacity and subsequent congestion, usually occurring at points where the roadway narrows.

The alignment of intersections at different heights (levels) to facilitate the flow of traffic without cross-traffic conflicts.

The systematic collection of traffic data to analyze and understand travel patterns, volume, and behaviors to inform transportation planning.

The makeup or mix of different types of vehicles on a roadway, such as passenger cars, trucks, buses, and motorcycles.

The number of vehicles that pass a given point on a roadway per unit of time, typically expressed in vehicles per hour.

The number of people traveling in a vehicle at a particular time.

The process of estimating the future demand for transportation services based on patterns, trends, and socioeconomic factors.

The discipline that deals with planning, design, operation, and management of transport systems to achieve safe, efficient, and convenient movement of people and goods.

The coordinated process to detect, respond to, and clear traffic incidents as quickly as possible while ensuring the safety of the affected area.

The number of parking spaces a building or land use will need based on a study of similar uses.

A control at some intersections where drivers must slow down or stop to yield the right-of-way to other vehicles or pedestrians.

An intersection control measure where all entering traffic is required to stop before proceeding, typically used in a low-volume, high-conflict areas.

The time taken to travel from one point to another.

A study that assesses the effects a new development will have on the transportation system and surrounding roads.

A measure of the ability of a traffic sign to reflect light from vehicle headlights back to the driver's eyes, ensuring visibility at night.

The number of vehicles occupying a certain length of road at a given moment, usually expressed in vehicles per kilometer or per mile.

Advanced applications which aim to provide innovative services relating to different modes of transport and traffic management.

A design approach that requires streets to be planned to enable safe access for all users, including pedestrians, bicyclists, motorists, and transit riders of all ages and abilities.

A model that predicts the destination and quantity of trips between zones in an urban area.

A geographical unit used for traffic analysis and modeling that represents similar travel behavior characteristics.

A type of intersection where traffic moves in a circle around a central island to reach various exits, similar to a roundabout but with different traffic rules.

A circular intersection design that permits traffic to flow in one direction around a central island.

A measure of the time or space required by a driver to enter or cross a major traffic stream.

A numerical index between 0 and 100 to indicate the condition of a roadway's surface.