Why is it believed that a driver cannot control a vehical after drinking?

After consuming alcohol, a driver's cognitive functions, coordination, and reaction times are significantly impaired. Alcohol affects the brain's ability to process information and make quick decisions, leading to decreased attention and slower reflexes. This impairment increases the risk of accidents, as the driver may struggle to judge distances, maintain lane discipline, and respond to changing road conditions. Consequently, it is widely believed that alcohol consumption severely compromises a driver's ability to safely operate a vehicle.