Comfort and Convenience
Sensitivity to sunlight differs from person to person. One traveller reaches for sunglasses and turns away from the glare, while another prefers bright daylight and an open view, so occupants in the same car often want different things.
Safety and Driver Assistance
Time spent in a stationary car, working out how the mirrors, indicators and climate controls respond, is rarely wasted. A driver who has just changed vehicles benefits most, because habits from the previous one transfer imperfectly.
Multimedia and Connectivity
Calls on the move are a separate need from music. Where a hands-free function is available, setting it up before departure means an incoming call can be answered without hunting through menus at speed.