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Bicycles in the Shade
Li is waiting at a red light in his car. In the other line, every vehicle appears to leave about five metres before the next one, which puzzles him. Five minutes later he understands. Why?
Li is waiting at a red light in his car. In the other line, every vehicle appears to leave about five metres before the next one, which puzzles him. Five minutes later he understands. Why?

Why were the apparent vehicles leaving five metres between one another at the red light?
Why were the apparent vehicles leaving five metres between one another at the red light?