The old rule of thumb is to take the speed you are traveling, divide it by 10, and add the result to the speed, to give the reaction distance. For example, if traveling 30 miles per hour, the reaction distance is 3 + 30 = 33 feet. At 60 miles per hour, reaction distance is 66 feet.
This comes from an assumption that the typical reaction time – from the time you realize that stopping is necessary until the brake pedal is fully depressed – is 0.75 seconds. At 60 miles per hour, the vehicle is moving at 88.2 feet per second (60 x 1.47), so the reaction distance is 66 feet (88.2 x 0.75).
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