Traffic enforcement camera

A traffic enforcement camera (also a red light camera, speed camera, road safety camera, bus lane camera, depending on use) is a camera which may be mounted beside or over a road or installed in an enforcement vehicle to detect motoring offenses, including speeding, vehicles going through a red traffic light, vehicles going through a toll booth without paying, unauthorized use of a bus lane, or for recording vehicles inside a congestion charge area. It may be linked to an automated ticketing system.

A worldwide review of studies found that speed cameras led to a reduction of "11% to 44% for fatal and serious injury crashes". The UK Department for Transport estimated that cameras had led to a 22% reduction in personal injury collisions and 42% fewer people being killed or seriously injured at camera sites. The British Medical Journal reported that speed cameras were effective at reducing accidents and injuries in their vicinity and recommended wider deployment. An LSE study in 2017 found that "adding another 1,000 cameras to British roads could save up to 190 lives annually, reduce up to 1,130 collisions and mitigate 330 serious injuries." Research indicates that automated traffic enforcement alleviates biases associated with police stops.

The latest automatic number-plate recognition systems can be used for the detection of average speeds and raise concerns over loss of privacy and the potential for governments to establish mass surveillance of vehicle movements and therefore by association also the movement of the vehicle's owner. Vehicle owners are often required by law to identify the driver of the vehicle and a case was taken to the European Court of Human Rights which found that human rights were not being breached. Some groups, such as the American Civil Liberties Union in the US, claim that "the common use of speed traps as a revenue source also undercuts the legitimacy of safety efforts."

Some bus lane enforcement cameras use a sensor in the road, which triggers a number-plate recognition camera, which compares the vehicle registration plate with a list of approved vehicles and records images of other vehicles. Other systems use a camera mounted on the bus, for example in London where they monitor Red routes on which stopping is not allowed for any purpose (other than taxis and disabled parking permit holders).

On Monday, February 23, 2009, New York City announced testing camera enforcement of bus lanes on 34th Street in Midtown Manhattan where a New York City taxi illegally using the bus lanes would face a fine of $150 adjudicated by the New York City Taxi and Limousine Commission.

In October 2013, in Melbourne (Australia), Melbourne Airport introduced seven automatic number-plate recognition (ANPR) cameras in their bus forecourt to monitor bus lanes and provide charging points based on vehicle type and the dwell time of each vehicle. Entry and Exit cameras determine the length of stay and provide alerts for unregistered or vehicles of concern via onscreen, email, or SMS-based alerts. This system was the first of several Sensor Dynamics based ANPR solutions.

A red light camera is a traffic camera that takes an image of a vehicle that goes through an intersection where the light is red. The system continuously monitors the traffic signal and the camera is triggered by any vehicle entering the intersection above a preset minimum speed and following a specified time after the signal has turned red.

Red light cameras are also utilized in capturing texting-while-driving violators. In many municipalities, an officer monitors the cameras in a live command center and records all violations, including texting at a red light.