I’m honestly not sure how traffic lights are controlled. It would seem to be an area of concern, that some lights might be off by five to fourteen seconds per day.
Imagine what a three second variance could cost people at street intersections. Perhaps I’m not looking at this from the proper perspective/knowledge base.
If one direction were to leave three seconds early/late, ouch...
I suppose each light would be affected by the same electricity source with variations.
I think of my VCR/DVR and other digital clocks. Good Lord, having to reset them every stinkin’ day?
I doubt that you will have to. With today's electronics, I think many of them have a built in timing reference, like a 32 khz crystal. It's the old motor driven clocks that use synchronous motors that will have an accuracy problem.
Leave it to government to mess with something that isn’t broken.