Which of the following is NOT a sign of impairment during a DUI stop?

The correct choice, indicating that quick and clear responses are not a sign of impairment during a DUI stop, highlights a key aspect of assessing a driver's condition. In situations where an officer suspects impairment, they look for behaviors that suggest a decrease in cognitive or motor function. Signs of impairment typically include slurred speech, confusion, and unsteady balance, all of which indicate that a person may be under the influence of alcohol or drugs and unable to perform tasks that require concentration and coordination effectively.

Quick and clear responses, on the other hand, suggest that the individual is functioning well in terms of cognitive processing and verbal communication. When a driver can respond quickly and clearly, it indicates that their mental clarity and ability to articulate thoughts are intact, hence not supporting the suspicion of impairment. Therefore, acknowledging that quick and clear responses are not associated with impairment is crucial for understanding how law enforcement evaluates a driver's fitness to operate a vehicle.