When driving at high speeds, always allow enough room to safely stop in emergencies by staying at least:
If you are driving at a speed of 30 mph or slower, a following time of two or three seconds may be enough to stop safely in the case of an emergency. However, at higher speeds, it is best to maintain a four-second following time.
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This question's difficulty is Medium
This questions appears in the following tests:
Washington Practice test 12
Washington Practice test 13