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You are driving a 40-foot bus at 50 mph. The road conditions and the visibility are good. You should keep at least___ seconds between you and a vehicle ahead to be safe.

A
Explaination
To determine the following distance for your vehicle, add 1 second for every 10 feet of vehicle length at speeds under 40 mph. Above 40 mph use the same formula, then add 1 second for the additional speed.