**Amphetamines** negatively affect a driver's behavior. These substances can cause a person to **lose patience** and act in an **impulsive or violent** manner. This is because amphetamines alter the mental state, causing the driver to have **little sense of danger** and react inappropriately in traffic situations.

Furthermore, although amphetamines can delay the sensation of **fatigue and sleepiness**, this is not beneficial, as once the effect of the drug wears off, the driver may suddenly feel very tired and fall asleep involuntarily. Therefore, the consumption of amphetamines not only generates impulsive behaviors but can also lead to dangerous situations on the road.