How does alcohol impact a driver's coordination and balance?

Alcohol significantly impairs a driver's coordination and balance by disrupting the brain's ability to integrate and process information necessary for controlling bodily movements. When alcohol is consumed, it can hinder the central nervous system's functioning, leading to reduced muscle control and the ability to perform tasks that require both steadiness and speed. This decline in motor skills makes it challenging for individuals to coordinate movements effectively while driving, which is crucial for tasks such as steering, braking, and changing lanes. Consequently, the correct answer highlights the critical issue of alcohol affecting the combination of steadiness and speed, a vital aspect of safe driving that relies on precise coordination and balance.