Traffic signals consist of three colours: Red, Yellow, and Green. When the signal turns red, you must stop, when it turns yellow, slow down and wait, and when it turns green, go.
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So why are three separate light modules still used for three different colors? Because, besides the color of light in traffic lights, the position of the light is also important for drivers. Colorblind drivers and pedestrians can understand which light is on thanks to the position of the light.
Yellow lights are displayed to the main road, to highlight the intersection and inform drivers of the need for caution.Red lights supplement stop signs on the side road approaches. All-way red flashing lights can supplement all-way stop control, but all-way yellow signals are prohibited by US regulations.
Question 13: I've seen a white light at a traffic signal, what does it mean? Answer: The white light at some traffic signal is an Emergency Vehicle Preemption (EVP) indication. When this indication is on, it means an emergency vehicle is in the area and has preempted the traffic signal.