maximum occupancy has been reached [英语听力大考验]

Occupancy and Maximum Occupancy

Occupancy is the amount of guests staying in a room, sometimes directly referred to as "occupants".
Channels, PMSs and other softwares will require hoteliers to indicate what the Maximum Occupancy of their room is.
Maximum Occupancy is the maximum amount of guests that can stay in a room. 
For example, if a room has a single bed and a double bed, then the maximum amount of people that can stay in the room is 3, and so 3 is the Maximum Occupancy of the room.

Most softwares divide the occupancy between Adults and Children, so a hotelier might be asked to also indicate the Maximum Adults and Maximum Children that can be in a room. Occasionally there will even be an option for Infants (usually based on whether the room can have a cot)

电影中的直接意思是“满员儿了”，没地方了。引申用法，用于表示达到了电梯荷载。The elevator's rated load is reached.

rated load
The designed safe operating load for the equipment under prescribed conditions.
额定负载，额定负载
设备在规定条件下的设计安全运行负荷。