OK guys. This is a useless idea. Discard it....people will die otherwise.

This is the load a seatbelt will take if crashing at a fixed object with a stopping distance of 1 foot if traveling at 30 mph.

http://hyperphysics.phy-astr.gsu.edu/hbase/seatb.html

bolt strength....fine is even stronger than coarse. http://dodgeram.org/tech/specs/bolts/SAE_bolt_strength.html

Like I said, its a different and easy way of doing it. I do it, and it works. Its all I can say. Of course always watch out for your own safety, cant hurt. Will this kill you? Not likely.

This is my last post!