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Question:

To lessen the chance of a collision, stay at least _________ behind the vehicle ahead of you for each 10 mph of speed.

A one car length
Explaination

You should stay at least one car length (about 20 feet) behind the vehicle in front of you for each 10 mph of speed. At high speeds or in bad weather, increase your following distance. However, many drivers have difficulty judging distances while they're driving. Hence, the three-seconds-plus rule is often a better way to determine a safe following distance.