You calculate the stopping distance by adding the reaction distance and the braking distance (reaction distance + braking distance = stopping distance).
The stopping distance is the entire distance the car travels from when you discover an obstacle or a hazard until the car comes to a complete stop. The stopping distance is made up of two parts: a reaction distance and a braking distance.
If the reaction time is longer than the average (one second) and/or if the braking occurs in other than ideal conditions, the stopping distance can be many times greater.
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