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-shrugs- then its like a speed limit. No one obeys it.
The only thing air bags improve over my 5 point harness is the slowest part of the acceleration my head experiences. The most force your body experiences is the instant of impact. Air bags do nothing for that. Standard seat belts allow you to slip slightly forward which creates additional velocity making impact with the steering wheel dangerous.
In that sense all the same the acceleration is constant and there is no internal shear. The shear is going to happen when Tau max is greatest and thats the instant you wreck and no pre-tensioning seat belt will protect you from that.
Once again. . .to achieve that much force on a healthy individual the other cars engine is going to be parked in your passenger seat and this is the least of your worries as the static shock of impact and your seat belt are more dangerous than aerterial shear.
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