New Hampshire Drivers Practice Test 2025 – 400 Free Practice Questions to Pass the Exam

When determining the required stopping distance for a vehicle traveling at 20 mph using the foot brake, it's essential to consider both the vehicle's speed and the dynamics of stopping. Generally, the stopping distance increases with speed due to the time it takes for the driver to react and the distance required to come to a complete stop.

At 20 mph, the average stopping distance is approximately 30 feet. This distance accounts for both the reaction time, which is the time it takes for the driver to apply the brake after recognizing the need to stop, as well as the braking distance itself, which is how far the vehicle travels while slowing down to a stop.

Other distances listed would either underestimate or overestimate the realistic stopping distance for a vehicle at that speed. For instance, distances less than 30 feet would not allow for sufficient time for safe stopping, while distances greater than 30 feet might reflect higher speeds or less effective braking. Thus, 30 feet is considered the standard stopping distance for a vehicle traveling at 20 mph when using the foot brake.