What behavior might indicate a driver is under the influence of alcohol?

Swerving or making abrupt stops is a significant indicator that a driver may be under the influence of alcohol. Alcohol impairs a person’s ability to operate a vehicle safely, affecting their reaction times, coordination, and judgment. A driver exhibiting these behaviors may struggle with maintaining lane discipline or controlling the vehicle effectively, which commonly results in erratic driving patterns such as swerving. These actions are often associated with impaired judgment and motor skills, which are adverse effects of alcohol consumption.

In contrast, driving at high speeds can result from various factors unrelated to alcohol, such as reckless driving or a sense of urgency. Maintaining a consistent speed on a straight road usually reflects good driving behavior and control, while using turn signals correctly is indicative of a cautious and responsible driver. These latter behaviors do not suggest impairment but rather adherence to safe driving practices.