What impaired ability may be observed at a BAC level of 0.10?

At a blood alcohol concentration (BAC) level of 0.10, individuals typically exhibit a noticeable decline in their motor skills and dexterity, which is often referred to as poor coordination. This level of intoxication affects the central nervous system, leading to difficulty in executing physical tasks that require hand-eye coordination and balance. Individuals may struggle with tasks such as walking straight, standing still, or accurately completing fine motor functions.

While slowed reactions, increased risk-taking, and impaired memory are also potential effects of alcohol, poor coordination is a direct and observable impairment closely associated with the numerical BAC level of 0.10. This makes it particularly relevant when considering the implications for tasks such as driving, where coordination is essential for safe operation of the vehicle.