At what BAC level does a person start to show signs of decreased coordination and difficulty steering?

A blood alcohol concentration (BAC) level of .05 is significant as it is a point where drivers begin to experience physical and cognitive impairments that can be observed. At this level, a driver might show decreased coordination, making it more challenging to steer effectively. Reaction times may slow, and muscle control can diminish, which is especially critical for tasks like driving. While some effects can start to be felt at lower BAC levels, it is around .05 that these impairments become more noticeable and can impact driving performance significantly. It is important to recognize that different individuals may experience the effects of alcohol differently, but .05 BAC is often considered the threshold at which many authorities start to see clear indications of impairment in a driver's ability to operate a vehicle safely.