What behavior is a strong indicator that a driver may be impaired?

Answer: B — Slowing or stopping suddenly without warning

Sudden slowing or stopping without warning can signal impairment in a driver. This behavior may indicate a lack of awareness or an inability to respond appropriately to the driving environment. Impaired drivers often struggle with maintaining a proper reaction time, leading to unexpected maneuvers that can endanger themselves and others on the road. In contrast, behaviors like following traffic signals, maintaining a consistent speed, and using mirrors wisely are typically indicative of a driver who is alert and in control of their vehicle. These actions reflect good driving habits and awareness of the surrounding conditions, highlighting the contrast with the potential erratic behavior of an impaired driver.