I have been involved in an accident with no air bag n no seat belt,I had a metal 3 spoke wheel at the time n I managed to bend one side round with my face,I walked away with a limp(hit my knee on bottom of dash) n a bust top lip n that's it,I've been in loads of accidents in my mates cars with no belt on n would have been worse off for wearing a belt,impact bars work wonders but bags n belts r poo,a guy had a belt on n hit a tree,air bag went off n broke his nose,wen the police arrived the guy fell over dead from internal bleedin,his belt had stop his body goin forward but his insides didn't stop till his chest wall.