Reaction time is defined as...
A)the time it takes for the vehicle to stop with the brakes applied.
B)The time that elapses from when the driver observes a danger until the vehicle stops.
C)The time that elapses from when the driver sees a danger until they respond to it.Correct
Reaction time is the time that elapses from when the driver sees an obstacle until they react. This time varies depending on the driver's psychophysical state, never due to speed or road conditions. Although it may seem that the reaction to an obstacle or unexpected situation must be instantaneous, the average reaction time of a driver is approximately 0.75 seconds.
The reaction distance is the metres travelled by the vehicle during the reaction time. This distance depends on the reaction time and the speed at which the vehicle is travelling (the higher the speed, the more metres covered in the same time).
Braking distance: This is the distance the vehicle travels from when the driver applies the brakes until the vehicle stops.
The stopping distance is the sum of the reaction distance plus the braking distance.
Therefore, the stopping distance is the distance the vehicle travels from when the driver perceives a danger until the vehicle comes to a complete stop.
The reaction distance is the metres travelled by the vehicle during the reaction time. This distance depends on the reaction time and the speed at which the vehicle is travelling (the higher the speed, the more metres covered in the same time).
Braking distance: This is the distance the vehicle travels from when the driver applies the brakes until the vehicle stops.
The stopping distance is the sum of the reaction distance plus the braking distance.
Therefore, the stopping distance is the distance the vehicle travels from when the driver perceives a danger until the vehicle comes to a complete stop.