Comfort and Convenience
Some people want a window cracked for fresh air; others prefer everything sealed against wind noise. The preference follows individual sensitivity to draughts, sound and smell, which varies widely between passengers.
Safety and Driver Assistance
Adjusting the mirrors and seating, then noting where the hazard lights and horn sit, is quick work in a stationary car. Doing it first removes guesswork from the moment you join traffic.
Multimedia and Connectivity
Calls are their own question on a long drive. Where hands-free operation is supported, a conversation can be handled without picking up the phone, and speech stays audible above steady road noise.