How do they choose the shut off times for highway on-ramp traffic signals?

Question

The one by my work turns off at various times, no matter what the traffic is like. I've seen a varience of at least 40 minutes.

Answer 1

They set the times after studying traffic patterns in a given area. They usually come on during rush hour or high traffic periods. The goal of those signals is to prevent backup when merging on the freeway.

Answer 2

i think they just go by the traffic conditions. by the way i absolutely hate those stupid lights. i complain about them all the time. i imagine that if they weren't there some people would have a hard time deciding when to merge. not me! i'm an aggressive driver. i was born merging. :)