Traffic signal control logic has been shown to reduce crashes and improve the safety of intersections.
When a traffic signal begins to turn green, it starts with a yellow light to give drivers plenty of time to make the turn. If cars are not given enough time, they may go through the intersection before the light turns green, resulting in a collision.
This process is generally attributed to the "green waves" that start at one end of an intersection and travel towards the other. The idea is that drivers will see a series of green lights along their route and know that they have enough time to make their turns without hitting oncoming traffic.
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