North Carolina RADAR State Practice Exam

What is the total stopping distance at 80 MPH?

1. 370 ft

2. 498 ft

3. 555 ft

4. 400 ft

The correct answer is: 498 ft

To determine the total stopping distance at a given speed, such as 80 MPH, it's essential to understand that stopping distance comprises two main components: reaction distance and braking distance. At higher speeds, these distances increase significantly. The reaction distance is the distance a vehicle travels while the driver recognizes the need to stop and moves their foot to the brake pedal. This distance can be calculated by considering the speed of the vehicle; for example, at 80 MPH, the reaction time of around 1.5 seconds would lead to a considerable distance traveled before braking occurs. Braking distance is calculated based on the vehicle's speed, road conditions, and the effectiveness of the brakes. For a vehicle traveling at 80 MPH, the braking distance is longer because the vehicle covers more ground while slowing down. Various factors, including weight, tire condition, and surface grip, can influence this distance. When you combine the reaction distance and braking distance for a vehicle at 80 MPH, the total stopping distance is typically found to be around 498 feet. This is a practical estimate used in driving safety contexts to indicate how much space is necessary to come to a complete stop from such a speed under average conditions. This measurement is a crucial consideration for drivers, as it