The entrance/boarding point for passengers at a station, platform, or bus stop (the place where passengers get on).
乗車口はホームの中央付近にあります。
The boarding entrance is located near the center of the platform.
電車のドア付近に『乗車口』と表示されている。
There is a sign saying 'boarding entrance' near the train doors.
混雑時は乗車口で列を作って待ってください。
Please line up at the boarding entrance when it's crowded.
A passenger door on a train, bus, or similar vehicle (the door used for boarding and alighting).
バスの前側の乗車口からお乗りください。
Please board from the front passenger door of the bus.
非常時は側面の乗車口も開くことがあります。
In an emergency, the side passenger doors may also open.