What primary function does the amber or yellow light serve in traffic control?

Answer

To signal the imminent change to red, allowing drivers time to slow down

The inclusion of the yellow light acts as a vital buffer, signaling the approach of the red light so drivers can safely decelerate or proceed cautiously if stopping is unsafe.

What primary function does the amber or yellow light serve in traffic control?

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Invention of the traffic light by Garrett Morgan was in Cleveland in 1923

inventionHistorySignaltraffictraffic light