A 3-second following distance permits a driver to break out of problems at speeds under which limit?

A 3-second following distance is a guideline that allows drivers to maintain a safe space between their vehicle and the one in front, providing enough time for reaction and braking in various driving conditions. This following distance can be particularly effective at lower speeds, where stopping distances are shorter.

At 45 miles per hour, a vehicle travels approximately 66 feet per second. Maintaining a 3-second following distance at this speed allows for a buffer of around 198 feet. This distance is adequate, giving the driver enough time to react and stop safely, should the vehicle in front suddenly brake or encounter an unexpected event.

As speeds increase beyond 45 miles per hour, the stopping distance also increases significantly due to higher momentum, which means a greater following distance is generally recommended to ensure safety. Therefore, while it might still be possible to stop at speeds up to 60 miles per hour with a 3-second following distance, the margin for error decreases, making it less advisable. Hence, the selection of 45 miles per hour aligns with the safety standard of using a 3-second following distance effectively.