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base2's point is valid. Most states have a provision for non-functioning lights, which comes into play after some certain time.
I never wait that long, honestly. I know most of the intersections I normally pass, and I know that pretty much everywhere else in the U.S., the systems are the same or similar.
Regarding enforcement though ... I did get stopped once after running a stop sign at maybe 2 a.m. on a Friday, in the middle of suburbia. The cop just wanted to warn me ... but he did stop me. I have no idea where he was hiding, either.
I was lost in some completely alien neighborhood, trying to find some obscure back road which would get me home without having to brave "drunk hour" on the multi-lane roads. He was really helpful and got me home when I might otherwise have spent another hour searching.
Hooray for good cops!
And good laws.
(Sorry, but I just can't bring myself to say "Hooray for Arkansas.")