What is a sign that a driver may be operating a vehicle under the influence?

Driving with an open window in cold weather can be an indicator that a driver is operating under the influence. This behavior might suggest that the driver is trying to combat the effects of alcohol or drugs, such as drowsiness or a feeling of being overheated. While driving under the influence, a person may display irrational behavior, such as making themselves uncomfortable to stay awake or alert.

In general, certain behaviors, such as erratic driving or unusual choices like having windows down in inappropriate weather conditions, can raise awareness regarding a driver's state. On the other hand, consistent signaling, frequent mirror checks, and avoiding distractions are actually signs of a responsible driver and do not typically correlate with impaired driving. These behaviors indicate awareness and attentiveness, which are crucial for safe driving.