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When following behind another car, it is considered a safe rule to allow at least: When following behind another car, it is considered a safe rule to allow at least:

  • A. one car length per 20 mph or 30 kph speed

  • B. one car length per 30 mph or 40 kph speed

  • C. one car length per 10 mph or 20 kph. speed

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    The correct answer is C
     
    This was an old rule of thumb decreeing that for every 10 mph of speed the following distance should be one car length. At 20 mph, following distance would be two car lengths, and six car lengths at 60 mph. This gave way to the more scientific 2-second and 3-second rule later on.