What factors have an influence on the total perception and reaction time of a vehicle driver?

The total perception and reaction time is the period from noticing a hazard to taking action (e.g., braking). The driver's psychophysical state (fatigue, concentration, experience) and external factors such as visibility, weather conditions, and the complexity of the road situation have a key influence on this time. The more difficult the conditions or the worse the driver's condition, the slower the reaction, which increases the risk of an accident.