When traveling over 40 mph, what is the recommended following distance?

The recommended following distance when traveling over 40 mph is typically about 5 seconds. This guideline is based on the need for adequate reaction time and stopping distance at higher speeds. At speeds over 40 mph, vehicles require a longer distance to safely stop due to increased momentum.

A following distance of 5 seconds allows for a buffer that accounts for variable factors such as road conditions, driver reaction time, and the performance characteristics of the vehicle being driven. This extra time provides drivers with a better chance to react to sudden stops or emergencies ahead, thus promoting safety.

In contrast, the other options reflect shorter distances that may not be sufficient at speeds exceeding 40 mph, where the risk of collision increases significantly without the proper space to react appropriately.