What does the stopping distance depend on?

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 on 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 that 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 brakes until the vehicle stops. This distance depends on speed, the mass and load of the vehicle, the vehicle's condition, road conditions, and weather conditions (rain x2, snow or ice x10). 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 hazard until the vehicle comes to a complete stop.