Can a driver's psychophysical condition influence their reaction capacity?

A driver in poor psychophysical condition (fatigue, drowsiness, having consumed alcohol or drugs, etc.) will have a reduced reaction capacity — in other words, they will take longer to react to any situation. Reaction time is the time that elapses from when the driver perceives a stimulus to when they respond to it. A reaction time of 0.75 seconds is generally considered normal, although it varies between individuals and depending on the driver's psychophysical state. Reaction distance is the distance the vehicle travels during the reaction time (if the time increases, the reaction distance also increases). It depends on how quickly the driver reacts and on the speed at which they are travelling.