How many feet does it take for an average driver moving at 20 miles per hour to apply their brakes when danger is detected?

When a driver detects danger and begins to apply the brakes at a speed of 20 miles per hour, the average stopping distance is approximately 44 feet. This figure is derived from both the perception-reaction time, which takes a moment for the driver to realize and respond to the hazard, and the actual braking distance required to bring the vehicle to a complete stop.

At 20 mph, a driver typically has a perception-reaction time of about 1.5 seconds. During this time, the vehicle continues to travel approximately 44 feet before the brakes are effectively engaged. After braking begins, the subsequent distance needed to halt the vehicle completely is accounted for, resulting in this overall stopping distance.

This information is crucial for understanding how speed impacts stopping distances, especially in emergency situations. Knowing the correct stopping distance helps drivers make informed decisions to maintain safe distances between vehicles and react appropriately to potential hazards on the road.