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Originally Posted by drex
hayaku is correct except that the knee bolsters in non-race cars tend to fracture knees on impact if sitting too close to the underdash. i would only add that a little distance between the knees and the lower dash would be ideal.
(race cars don't have the lower dash knee bolsters for that reason)..
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True enough, but thankfully the newer cars have made design changes, so that we don't see much more than knee contusions now from this. Occasionally hip dislocations or fractures, where the knee impacts the dash, driving the femur back. Even those are fairly uncommon today.