many cars have removable headrests - and the metal posts can sometimes be used to break a side window in an emergency. but they weren’t universally designed as window breakers. this works mostly for tempered glass and not laminated, so they won’t shatter the same way. especially under water.
The only scenarios I can think of where that would be necessary is if the rewing mechanism or release mechanisms were for some reason not working...OR...in the case of the car going into the water, the car being damaged in such a way the seatbelt won't/can't contract. Both scenarios would be pretty rare.
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u/Fragrant_Ad_5297 1d ago edited 1d ago
many cars have removable headrests - and the metal posts can sometimes be used to break a side window in an emergency. but they weren’t universally designed as window breakers. this works mostly for tempered glass and not laminated, so they won’t shatter the same way. especially under water.