What is the recommended following distance when traveling slower than 40 mph?

The recommended following distance when traveling slower than 40 mph is one second. This guideline is established to help drivers maintain a safe distance behind the vehicle in front of them, allowing for sufficient reaction time in case of sudden stops or emergencies. At lower speeds, one second gives a driver a chance to respond to potential hazards without being so far behind that they risk being cut off by other vehicles or losing situational awareness.

In urban environments or during inclement weather, where conditions may change rapidly, this one-second rule becomes particularly important. It strikes a balance between being close enough to maintain traffic flow and ensuring safety when confronted with unexpected situations. As speeds increase, the following distance should also increase to accommodate the greater stopping distance required at higher speeds.