The phrase "middle passenger" refers to a person who sits between two other people, typically in a vehicle, airplane, or seating arrangement. Full definition
This leads to great comfort, especially for middle passengers. (kbb.com)
Plus, there's some audible suspension noise that can get irritating, and it lacks comfortable seating for the rear middle passenger. (carwale.com)
Appreciable standard safety features — dual - front airbags, ABS with EBD, front seat belts with pre-tensioners, ISOFIX child seat mounts and three - point seatbelt for the rear middle passenger. (cardekho.com)