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If the car has seat belts then you have to use them unless you have a pass from the doctor for medical reasons, and my OP is they are there more in case the doors fly open.
Like turn signals, once they are put on the car they have to work, once seat belts are installed in the car you have to use them. In Oregon at least, if you got pulled over for some reason and the cop see you have them but are not using he/she could give you a ticket.