What does FMCSA recommend for a CMV traveling under 40 mph regarding following distance?

The recommendation provided by the FMCSA for a commercial motor vehicle (CMV) traveling under 40 mph to maintain a safe following distance is to leave one second for every 10 feet of vehicle length. This guideline helps ensure that the driver has enough reaction time to respond to sudden stops or emergencies happening in front of them.

The one-second rule for every 10 feet is based on the average perception and reaction time of drivers, which allows plenty of space for safe stopping. For instance, if a truck is 50 feet long, applying this guideline would mean a following distance of approximately five seconds, which is a substantial buffer to enhance safety. This method of calculating the following distance takes into account not only the speed but also the size of the vehicle, which affects stopping distance and overall safety on the road.

By adhering to this recommendation, drivers can help mitigate the risk of rear-end collisions and improve the overall safety of both themselves and other road users.