My Toyota has occupant sensing. If the driver isn't wearing their seatbelt, this annoying as hell beep starts, and will not go away. If there is someone in the passenger's seat, there is a second light and beeper on the passenger's side dash that warns them to buckle their seatbelt as well. Only once the belt is buckled does the passenger's airbag status light switch from off to on. I always wear my belt, so these things don't give me reason to wear the seatbelts, but they give the people riding in my car who won't normally wear a seatbelt a reason to wear them.
