What is the average stopping distance at 30 mph?

The average stopping distance at a speed of 30 mph is approximately 104 feet. This figure combines various factors influencing a vehicle's stopping distance, including the perception time, reaction time, and braking distance.

When a driver sees a hazard, there is a brief period (perception time) during which they recognize the need to stop. After that, they need to react by applying the brakes (reaction time). Finally, the vehicle travels a certain distance while braking until it comes to a complete stop.

For vehicles traveling at 30 mph, under typical conditions, the cumulative effect of these components gives an average stopping distance of about 104 feet. This estimate helps drivers understand the importance of maintaining a safe following distance to allow enough time and space to stop safely without risk of collision. The other distances provided are relative to higher speeds—the faster the speed, the longer the stopping distance required, which illustrates the critical nature of speed management in driving safely.