The phrase "occupant space" refers to the area or room where people are supposed to be inside a building or a vehicle. It is the designated space for individuals to sit, stand, or move around comfortably. Full definition
A direct correlation to a large amount of interior room is plenty of occupant space. (nextgreencar.com)
The front seats are incredibly comfortable and occupant space in the front is wonderful. (truecar.com)
Inside, the layout is conservative and tasteful with simply arranged buttons and knobs, and occupant space front and back is roomy and comfortable. (hybridcars.com)