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Originally Posted by TimMullen
Why would this be? The belt locks under sudden deceleration, the "pre-locked" retractor just starts out that way. The belt still stretches, the tear strips still tear, and the seat belt pre-tensioner still pre-tensions. The only difference would be that the seat belt locks a millisecond sooner...
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Well from my understanding, the belts are designed with the small amount of stretching before the mechanism locks. I can ask one of the NHTSA instructors if you would like but they told us to stop parents who llock their kids into booster seats with the pre-tensioned belt, in order to prevent further injury. Try it at your own risk, if you can find a drivers belt with locking retractors..