Comfort and Convenience
Cabin temperature is a personal matter. Passengers sitting still often feel cooler than the driver, and clothing, time of day and sun on one side all shift what counts as pleasant, so preferences rarely match exactly.
Safety and Driver Assistance
Checking the basics while still parked takes a minute: mirrors, lights, wipers, demisting. Doing this before setting off means fewer decisions later, especially if the weather changes on a route you do not know.
Multimedia and Connectivity
Navigation drains a phone quickly, so charging on the move is the practical concern on a long route. If a suitable power outlet and cable are available, the phone stays usable at the destination too.