I should have been clearer on two behaviors. What I describe is if you are "alone". Green light often (not everywhere) don't stay green if there is no car. But

I should have been clearer on two behaviors. What I describe is if you are "alone". Green light often (not everywhere) don't stay green if there is no car. But if there is traffic, it is made in such a way that when you get a green somewhere, you can expect every subsequent intersection to turn green when the head of the traffic arrives. So the first vehicle will see a red light turn green as they approach, and the ideal timing is around the speed limit. Further cars will have a green light, but with no intensive to speed as they are sandwiched between cars. Also I should say that this is empirical evidence based on about 20 intersections I pass often. I don't know how much of a rule it is country wise as I don't pay attention to that when I go places I don't routinely go.