A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
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Car-free Zones – UK
Areas of a city or town in which automobile traffic is prohibited (see also “Auto-free Zones and “Pedestrianised Zones”.
Carpooling
The shared use of a car, especially for commuting to work, often by people who each have a car but travel together to save cost and to promote other socio-environmental benefits. In some locations, there are special facilities intended to encourage carpooling such as designated pick-up points and high-occupancy vehicle lanes that only allow cars with multiple riders at certain times of the day.
Carriageway
A series of lanes (or part of a road) in which vehicles travel
Carsharing
A type of car-rental where people rent cars for short time periods, often by the hour with self-service reservation, pickup, and return.
Central Reservation
The area that separates opposing lanes of traffic (see also “Median”).
Channelisation
The separation and direction of vehicle and pedestrian movements at an intersection into defined paths through the use of roadway features (such as traffic islands) and signs (see also “Intersection Channelisation”).
Chicane
A traffic calming device comprising a sequence of tight serpentine curves (usually an S-shape curve) along a street designed to reduce car speed.
Clear Zone – UK
A defined urban area which exploits new technologies and operational approaches to improve quality of life and support economic growth, whilst minimising the adverse impacts of its transport systems. A Clear Zone seeks to provide a liveable, accessible and lively urban centre where traffic congestion, pollution, noise, stress and other negative impacts of mobility are eliminated or limited, through the implementation of a package of transport related measures using innovative technologies.
Collector Lane – US
A freeway or expressway lane used for slower moving traffic and has more access to exits/off ramps.
Congestion Charge – UK
A demand management strategy aimed to reduce auto travel into congested urban areas. The London congestion charge is a fee for some motorists travelling within those parts of London designated as the Congestion Charge Zone. It aims to discourage the use of private cars, reduce congestion, and raise funds for investment in public transport.
Contraflow Lane
A lane designed to allow certain vehicles (such as buses, bicycles or HOVs) to travel in the opposite direction of motor vehicle traffic on a one-way street and thereby save time and/or travel distance (see also “Counterflow Lane”).
Countdown Signal
A pedestrian signal with an added display that shows the countdown of the remaining available crossing time.
Counterflow Lane A lane designed to allow certain vehicles (such as buses, bicycles or HOVs) to travel in the opposite direction of motor vehicle traffic on a one-way street and thereby save time and/or travel distance (see also “Contraflow Lane”).
Coupon Parking
A form of parking payment, similar to “Pay and Display” without the use of machines. The motorist purchases a booklet of coupons in advance from the authorities instead (see also “Pay and Display”).
Crossroads
A road junction where two or more roads either meet or cross at grade.
Crosswalk – US
A pedestrian crossing.
Curb – US
The edge where a raised pavement/sidewalk/footpath, road median, or road shoulder meets an unraised street or other roadway (see also “Kerb”).
Curb Cut – US
A ramp leading smoothly down from a sidewalk to a street, rather than abruptly ending with a curb (see also “Dropped Kerb” and “Pram Ramp”).
Curb Extension – US
A horizontal intrusion of the curb into the roadway resulting in a narrower section of roadway.