Commercial Driver’s License (CDL) Practice Exam

When traveling at speeds over 35 MPH, maintaining a safe following distance is crucial for ensuring adequate reaction time in case of sudden stops or emergencies. The commonly accepted guideline is that drivers should maintain a following distance of one second for every 25 feet of vehicle length. This rule helps drivers gauge how much space they need to allow for safe braking and maneuvering.

At higher speeds, the stopping distance increases significantly, and relying on the one-second rule for every 25 feet allows for a quicker and safer reaction to unforeseen circumstances. This is particularly important as speed increases, allowing for a reasonable buffer of time and space to respond to the actions of the vehicle in front.

In contrast, the distances suggested in the other choices might lead to insufficient following distance, especially at higher speeds, which could result in collisions if the lead vehicle suddenly slows or stops. Therefore, adhering to the one-second rule is essential for safer driving in these conditions.