another way of looking at it, if everyone could move at the speed of light, you would only have very few people on the roads at a time (since the travel time to anywhere on earth would be so fast). At the same time, I wouldn't want to pull out in front of someone going that fast. So although it is possible to get places very very fast, and have few people on the roads at the same time, that doesn't make it any more safe.
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