Perception time is how long it takes for your brain to recognise a situation and understands that you need to stop. Usually this takes ¾ second but depends on the driver.
Reaction time is the time it takes to physically react to a danger by moving your foot from the gas pedal to the brake pedal. Average reaction time is ¾ second.
Braking Time is the time it takes a vehicle to stop from the time the brake is first applied until the vehicle actually stops.
According to the American Association of State Highway & Transportation Officials(AASHO), it takes an average driver 1.64 seconds to perceive and react to a roadside hazard.
Ninety Five percent of people react within 2.5 seconds.
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