**Alcohol** directly affects a driver's **reaction time**. Reaction time is the interval that elapses from when we perceive a stimulus, such as a red traffic light, until we respond, for example, by pressing the brake. Under normal conditions, this time is usually between half a second and one second.

The consumption of alcohol causes us to need **more time to react**. This is because alcohol affects our ability to make decisions and coordinate movements, which increases the time it takes us to respond to an unexpected event on the road. Additionally, alcohol can cause distractions and make it difficult to perceive the environment, which also contributes to an increase in reaction time.

Therefore, alcohol influences the **reaction distance** because by increasing the reaction time, the vehicle covers more space before the driver can adequately respond to a dangerous situation.