How is the timing interval determined between the red, yellow and green traffic lights at an intersection?

The City of Chesapeake Department of Traffic Engineering is responsible for determining the traffic light timing intervals. Times at signals is determined based on variables such as the posted speed limit, typical deceleration rates of vehicles, the grade of the road (uphill or downhill), the width of the intersection, and the amount of time it takes a driver to see the yellow signal and react (perception & reaction time). All traffic signal timing has been evaluated and approved by the department of traffic engineering and reviewed by VDOT in accordance with VDOT guidelines.

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