Comfort and Convenience
Cabin temperature is the classic example: what feels pleasant to one person feels stuffy or chilly to another, because build, clothing and seat position all differ. Passengers rarely agree, so it is usually negotiated aloud.
Safety and Driver Assistance
Before setting off with others, it is worth locating the essentials, such as lights, wipers, hazard switch, mirrors and seat adjustment, while stationary. Preparation done in the driveway does not have to compete with traffic or conversation.
Multimedia and Connectivity
Charging is the need that surfaces first on a long day: a phone used for navigation drains steadily, and if a usable power outlet sits within a passenger's reach, topping up need not interrupt the journey.