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but often too I come up to a red light with a clear path through, and just before it turns green, numerous other cars are coming up to it from the other directions to get a red light for me to go through.
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And the ones that let just three cars through on a left turn even though there is 10 cars waiting, must be inefficient both in terms of fuel economy and how much traffic the lights can handle.
As a programmer I find most traffic light setups incomprehensibly stupid, inefficient and annoying. I can only assume the early lights had so little computing power they had to be stupid, now they just make them the same out of tradition.
I've seen a few newer light setups that are quite intelligent though and will be able to give me a green light with no stop even if it's red on arrival. And apparently they do some more advanced decision making as I haven't been able to predict when they switch.