This 7″ monitor Rear view camera system mounted to prevent passengers avoid trapped by door.
The inside dome camera to monitoring bus back door all time, videos display all the time for driver can see the situation of the back door.
If there someone stand at the danger area, he will stop the back door shutdown.

When switch to Reverse gear, 7″ monitor will turn to Reverse camera automatic, for reversing safety.

Passenger bus back door camera view

Passenger bus back door camera view