You just described the two-second rule. Much easier than the car-length mathobatics. I use the rear-tire rule too, though my dad doesn't.
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I'll just note that cameras have not, to my knowledge, done all that much to really prevent crime.
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That's not their point. They're there to catch criminals, not prevent them.
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Compare this to what happens in major cities during power outages, when there are no traffic lights. No accidents! People are suddenly forced to become considerate of others in order to make the system work; and guess what, they DO.
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Only as long as the outage is temporary. If all lights were replaced with signs, people would resume "trying to get ahead of the crowd," and things would get ugly again.