Taxi drivers mechanically open the left back door for customers most of the time (for some taxis, the driver goes to the back door and opens it for the customers) so the passengers do not need to open the door by themselves.
タクシーは自動で（一部タクシー会社は乗務員が後方に回り込んで開ける）後方左側のドアを開ける場合が多いので、客は自分で開ける必要はない。