A Traffic Light (or traffic signal) is an electronic device positioned at a road intersection or pedestrian crossing that regulates the flow of traffic through the intersection or at the crossing by variously displaying to motorists and pedestrians either; a red, amber or green light (or symbol), indicating which vehicles and/or pedestrians have right of way at a particular point in time.
The sign below is a traffic light advanced warning sign.
The useful life of traffic signals will vary considerably due to a range of environmental & other factors. A useful life of 25 years appears to be typical for the traffic signals operated or investigated by the organisations listed below.
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