Do traffic lights have sensors?

How to Trigger Green Traffic Lights. Three Methods: Determining the Type of Traffic Lights Positioning Your Vehicle Correctly Boosting Your Vehicle’s Detection Community Q&A. If you drive a car, bike, or motorcycle, chances are you regularly experience the frustration of waiting at red traffic lights that seem to take forever to change. read more

Some lights don't have any sort of detectors. For example, in a large city, the traffic lights may simply operate on timers -- no matter what time of day it is, there is going to be a lot of traffic. In the suburbs and on country roads, however, detectors are common. read more

You can can have separate sensors per lane which can determine how much time should go to left or right turn lanes, if they have dedicated traffic phase periods. Sensors might also be used for a wider city wide computer system such as the SCOOT (Developed in the UK) or SCATS (Developed in Australia). read more