What behavior may indicate an impairment during vehicle operation?

Quick lane changes without signaling can indicate impairment during vehicle operation because this behavior often suggests a lack of attention to the surrounding environment or a failure to follow safe driving practices. Drivers who are impaired may struggle to maintain consistent awareness of their surroundings and proper driving protocols. Such actions are usually associated with cognitive and motor skill deficits, which are characteristic of impairment, particularly due to substances like alcohol or drugs.

In contrast, consistently watching the road, maintaining a steady speed, and proper use of mirrors are all behaviors typically associated with safe and responsible driving. These actions demonstrate awareness and attentiveness, which are essential for effective vehicle operation. Accordingly, quick lane changes without signaling starkly contrasts with the behaviors reflective of a competent driver.