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Question:

To maintain a good space cushion between your vehicle and the vehicle ahead, you should use the

A three-second rule
Explaination

Four of every ten crashes are rear-end collisions, usually because someone is following too closely. To maintain a good space cushion between your vehicle and a vehicle ahead, you should use the three-second rule in ideal road conditions, but increase the distance to 4-6 seconds if weather or traffic require it.