At least in the late '40's / early '50's. When I did the announcing at a local stock car - generic term - in the early '50's; they used "tank seat belts" - they were a big wide lap belt that had been used in military tanks salvaged from war surplus stores. Why more of these drivers didn't "bite the bullet", is still a mystery to me. One night, one car did an "end over end" together with a "barrel roll." The body AND the roll bar cage - they often used black iron pipe for roll bars back then; along with some pretty shaky welds!!! - RIPPED COMPLETELY OFF the frame leaving the driver sitting there with a "stunned" look on his face! (often the floor boards were cut out to gain access to the frame for the roll bars) And not a single scratch!! He wanted to carry on, but the ignition wiring was ripped off the engine when the body "went south!!"