Which behavior is least likely to indicate impairment during a traffic stop?

Driving the speed limit perfectly is least likely to indicate impairment during a traffic stop because maintaining the correct speed is a clear indication of a driver’s awareness and control of their vehicle. When someone drives within the legal speed limits, it shows they are likely adhering to traffic laws and are not displaying erratic behavior that could suggest impairment.

In contrast, frequent lane changes without signaling, following another vehicle too closely, and stopping too far past the stop line are all behaviors that can indicate a lack of attention or control, which are common signs of impaired driving. These actions may suggest distractions or impaired judgment, making them more likely to raise suspicion in the eyes of law enforcement officers.