What is the appropriate following distance at speeds under 40 mph?

The appropriate following distance at speeds under 40 mph is indeed one second for every 10 feet of vehicle. This rule helps ensure a safe distance between vehicles, allowing enough time to react to sudden stops or changes in traffic conditions. At lower speeds, such as those under 40 mph, maintaining this specific following distance helps prevent collisions by providing adequate distance to brake or maneuver safely. This rule accounts for the shorter stopping distances required at lower speeds compared to higher speeds, enhancing safety on the road.

Understanding the need for a proper following distance assists drivers in adhering to best practices for safe driving, particularly in passenger vehicles and smaller commercial vehicles, ensuring that they have a clear view of the road and enough time to react to any potential hazards.