High doses of amphetamines make many people hostile and aggressive which could also result in risky driving behavior. Cocaine The changes in a person's perception, mood, and thinking during cocaine intoxication are particularly relevant to driving skills. The most dramatic effects of cocaine with respect to driving are on vision. Cocaine may cause a higher sensitivity to light, halos around bright objects, and difficulty focusing. Many users say that cocaine actually improves their driving ability, which is not surprising because the drug induces euphoria and feelings of increased mental and physical abilities.
Cocaine can also heighten irritability, excitability, and startle response.
Users have reported that sudden sounds, such as horns or sirens, have caused them severe anxiety coupled with rapid steering or braking reactions, even when the source of the sound was not in the immediate vicinity of their vehicles. Everyone surveyed reported attention lapses while driving and ignoring relevant stimuli such as changes in traffic signals. It is a crime in Canada to operate any motor vehicle, boat, railway equipment, or aircraft while one's ability to do so is impaired by alcohol or other drugs. That is the law under the Criminal Code of Canada . More charges are laid for drinking and driving than for any other federal offence and, like a murderer or a bank robber, a convicted impaired driver has a criminal record.