Some of the visual clues for the defensive driver to spot an impaired driver are?

Some visual clues for a defensive driver to spot an impaired driver include erratic or inconsistent lane changes, swerving within the lane, and difficulty maintaining speed. Additionally, impaired drivers may exhibit unusual behaviors such as abrupt stops, delayed reactions to traffic signals, or driving without headlights at night. Other signs include tailgating or driving too slowly, which can indicate a lack of awareness or control. Being vigilant for these behaviors can help defensive drivers anticipate potential hazards on the road.