What is the minimum safe distance to follow a vehicle while driving at 55 mph?

The minimum safe distance to follow a vehicle while driving at 55 mph is 400 feet. This distance is crucial for maintaining a safe stopping distance, which is essential to prevent rear-end collisions. At higher speeds, like 55 mph, vehicles require more time and distance to stop safely in response to sudden changes in traffic conditions. A following distance of 400 feet allows for better reaction time and greater safety, ensuring that drivers have enough space to brake if the vehicle in front of them stops unexpectedly. This distance not only enhances safety but also promotes smoother traffic flow by preventing tailgating and the associated risks.