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The reaction distance is the distance traveled from the time

Total stopping distance is the sum of your perception distance (how far your vehicle goes from when you see the hazard until your brain processes it), reaction distance (how far the vehicle goes from when your brain orders your foot to take action until your foot actually starts to brake), and braking distance (how far the vehicle continues to travel once you apply the brake). An average driver's perception time is about 1 3/4 seconds. His or her reaction time is between 3/4 second and 1 second. (Note: 55 mph is equal to about 81 feet per second. At this speed, a reaction time of 3/4 second is equivalent to a reaction distance of 61 feet.)