Why do non-pedestrian controlled crossings need the button pushed?

Question

There are plenty of intersections where a walk signal comes on automatically, why do some intersections require a button push to initiate the walk signal when it doesn’t seem to make a difference in light timing or duration?

In: Engineering

Answer 1

If there’s no button, then there is always a Walk signal regularly inserted into the traffic cycles.

If there is a button, then there is no Walk signal in the light cycle until the button is pressed, and then a walk signal is inserted into the cycle once.