Michigan Commercial Driver's License (CDL) Practice Exam

The appropriate following distance under normal driving conditions is three seconds. This guideline is based on general safe driving practices that allow a driver sufficient time to react to the vehicle in front of them, should an unexpected stop or slowdown occur. A three-second gap enables drivers to assess the road conditions and the behavior of other drivers, providing an adequate buffer against potential collisions. To establish this distance, a driver can use a reference point, such as a sign or a tree, on the side of the road. When the vehicle in front passes the reference point, the driver should start counting seconds until they pass the same point. If they reach the reference point before three seconds are up, they are following too closely and should increase their distance for safety. This practice is important not only for individual safety but also contributes to overall traffic flow, reducing the likelihood of accidents. In contrast, shorter following distances, like one or two seconds, do not provide enough time to react to sudden stops and may lead to rear-end collisions.