How Do Traffic Lights Work?

Answer

Some traffic lights simply operate on timers. However, on country roads and in the suburbs, detectors are common. The detectors have inductive loops which operate by detecting a change of inductance. The inductance increase with the number of vehicles parked in front of the traffic light.
5 Additional Answers
The operations of traffic lights work by the use of car sensors that are buried in the carriageway on each approach to the signals. They detect cars as they pass over them and either change the signals to green or extend the green signal for that approach. During rush hours, the green period will extend up to a pre-set time to allow a higher movement of cars through an intersection.
Traffic lights are computerized controlled and all the work is done by a controller machine. Traffic lights can be computer controlled from a UTC centre. The computer control can be Fixed Time or under SCOOT control.
Traffic lights are imperative on a busy street in the city. They are mostly operated by electrical currents that are supervised on a daily basis.
Traffic lights work by a sensor in the ground. When a car stops there is a sensor in the ground that starts a timer, when the time runs out the light turns a different color.
Many traffic lights work based on time. They have timers in them that are set to allow the red, yellow or green light to be on for a certain amount of seconds. They are coordinated with the lights for the road running perpendicular
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