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There's definitely no standard. I've seen some that are 1-2 s, and I've seen some that are 5s. I think its entirely determined by the city and the intersection..
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"I'm typing on a computer of science, which is being sent by science wires to a little science server where you can access it. I'm not typing on a computer of philosophy or religion or whatever other thing you think can be used to understand the universe because they're a poor substitute in the role of understanding the universe which exists independent from ourselves." - Willravel
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