What behavior might signal a driver’s impairment when they are exiting the vehicle?

Leaning against the vehicle can indeed signal a driver’s impairment. This behavior may indicate that the individual is having difficulty maintaining their balance or is feeling unsteady, which are common signs of impairment, potentially due to alcohol or drugs. When someone who has just exited a vehicle leans against it, it suggests that they may not be fully in control of their body, raising concerns about their overall coordination and physical condition.

In terms of context, other behaviors listed do not necessarily indicate impairment. For example, active communication with passengers may simply reflect social interaction, and getting out of the vehicle immediately without assistance does not imply impairment, as some individuals may be perfectly capable of doing so without issue. Resting a head on the dashboard could suggest fatigue or simply a moment of rest, and while it might sometimes accompany impairment, it's not definitive on its own. Thus, leaning against the vehicle stands out as a clear signal that could warrant further investigation regarding the driver’s impairment.