22-05-2015, 09:32 PM
It's not just the belt though, it's the fact you're held in the seat by the pretension, blown in the face by the airbag to save your head/neck and the crumple zone takes a large part of the impact. Hitting your head on the windscreen at 60 is almost certainly going to do more damage. It may be true of old cars that only have belts - likely to snap your neck and/or slip under the belt lol - but I just don't see it being true in any modern car.