What is a common sign that a driver might be performing erratically due to alcohol impairment?

Drifting in and out of lanes is a common sign of alcohol impairment in a driver. This behavior indicates a lack of control and difficulty in maintaining their vehicle's position on the road. Alcohol affects cognitive functions and motor skills, making it challenging for an impaired driver to stay in their lane. Additionally, drifting can be a sign of distracted driving or difficulty in focusing on the task of driving, both of which are exacerbated by alcohol consumption. Recognizing such erratic behavior is crucial for preventing potential accidents and ensuring road safety.

While using turn signals consistently is a sign of good driving behavior, and maintaining a steady following distance reflects attentive driving, these actions do not indicate impairment. Driving below the speed limit could suggest caution, but in some cases, it may also be a result of other factors unrelated to alcohol impairment, such as a lack of confidence or knowledge of the road.