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The total stopping distance is the sum of the reaction distance and the braking distance. In a non-metric country the stopping distance in feet given a velocity in MPH can be approximated as follows: (1) take the first digit of the velocity, and square it. Add a zero to the result, then divide by 2. (2) sum the previous result to the double of the velocity. Example: velocity = 50MPH. stopping distance = 5 squared = 25, add a zero = 250, divide by 2 = 125, sum 2 *50 = 225 feet. In Germany the rule of thumb for the stopping distance in a city in good conditions is the 1-second rule, i.e. the distance covered in 1 second should at most be the distance to the vehicle ahead. At 50 km/h this corresponds to about 15 m. For higher speeds up to about 100 km/h a similarly defined 2-second rule applies, which for 100 km/h translates to about 50 m. For speeds on the order of 100 km/h there is also the more or less equivalent rule that the stopping distance is the speed divided by 2 k/h referred to as ''halber tacho'' (half speed), e.g. for 100 km/h the stopping distance is 50 m. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Total stopping distance」の詳細全文を読む スポンサード リンク
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