Seat belt warnings became mandatory in the USA in 1972[0]. From the mid 1970s until fairly recently, the warning tone would stop after a few seconds.

[0] https://www.nationalacademies.org/read/10832/chapter/5

I've known people who would just endure the warning noise until it stopped.

Many of them are just a light, and that's it. Or maybe the buzzer was burnt out lol.

My parents disabled a couple by pulling a fuse or cutting a wire, but a lot of their use of the vehicles was off road at walking speeds. They wore seat belts on the road.

Mawr’s out there driving his Model T around town.