Where to post the warning sign that no passengers are allowed on freight elevators?

The door of the freight elevator and the inside of the freight elevator.

1. Paste the warning sign directly on the freight elevator door or door frame so that people can see and understand the prohibition of riding when approaching the freight elevator.

2. Fix the warning sign on the wall inside the freight elevator to ensure that people can see it after entering the freight elevator and be reminded not to ride on it.