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What is called how far a car travels in the time it takes driver to react situation and apply brake?

The distance a car travels in the time it takes for the driver to react to a situation and apply the brakes is called the reaction distance. It is determined by the driver's perception-reaction time and the vehicle's speed. Perception-reaction time is the time it takes for the driver to perceive a hazard, process the information, and respond by applying the brakes. It typically ranges from 1 to 2 seconds.

The reaction distance is calculated by multiplying the vehicle's speed by the perception-reaction time. For example, if a car is traveling at 60 mph and the driver's perception-reaction time is 2 seconds, the reaction distance would be 120 feet.

Reaction distance is an important factor in determining the minimum stopping distance for a vehicle. The minimum stopping distance is the sum of the reaction distance and the braking distance.