Passenger is used to describe something that is designed for passengers, rather than for drivers or freight.
I sat in the passenger seat.
我坐在旅客座位上。
passengers
A passenger in a vehicle such as a bus, boat, or plane is a person who is travelling in it, but who is not driving it or working on it.
Mr Fullemann was a passenger in the car when it crashed.
汽车撞毁时,富勒曼先生就在车里。
a flight from Milan with more than forty passengers on board.
一架搭载着四十多名乘客的来自米兰的航班。