Impaired drivers often:

Impaired drivers often exhibit erratic behavior on the road, which includes drifting in and out of lanes as well as having difficulty maintaining a consistent speed. These behaviors stem from the effects of substances such as alcohol or drugs on a driver's coordination, judgment, and reaction times.

When a driver is impaired, their ability to control the vehicle diminishes, leading to swerving between lanes as they struggle to correct their path. Similarly, maintaining a steady speed becomes challenging, resulting in fluctuations that can make their driving unpredictable to others on the road.

The choice indicating that both drifting in and out of lanes and difficulty maintaining speed are common behaviors among impaired drivers captures the reality that impairment often leads to a lack of control and inconsistency in driving patterns. This understanding emphasizes the importance of recognizing such dangerous signs and encourages proactive measures to avoid situations involving impaired drivers.