5 ms·
No, they lock your seatbelt before you move. Modern ones do this during heavy braking: all you notice is that when you step on the brake your belt is already lo
by ynniv 10y ago
No, they lock your seatbelt before you move. Modern ones do this during heavy braking: all you notice is that when you step on the brake your belt is already locked.
- semi-extrinsic 10y agoThat's not the pretensioner. The pretensioner is a one-shot pyrotechnic device (i.e. explosive) that pulls in the seatbelt. It's only activated if the car senses a crash is happening.
- ynniv 10y agoIt's an ambiguous term. You're talking about a pyrotechnic system that can only be used once, but there are also electronic systems that are a part of daily driving. My point is that the 150ms happens before the person moves at all, so 30mph is not part of the equation.
- tropo 10y agoI defeat this by driving with my left shoulder far forward. This is because it nearly killed me several times. When in a dangerous situation, I may need to brake and/or turn my body to look behind me. It's the "and" which is trouble. If I brake and then need to look, the shoulder belt might stop me, leading to a crash. The fundamental problem is that restraints are designed for 100% passive crash dummies. Restraints are not designed for people who must actively control the vehicle.