We don't need no stinking rules.
Probably better safe than sorry - I know that 4" was considered enough back then, but never got into the engineering specs. There were the occasional fall-throughs, but no telling if they just hit some thinner spots or if the rest were just living on borrowed time.
Thanks for the link - it seems there really is something for everything on the internet.
I’ve gone through.
Not lately. It’s not fun on snowmobile,but I imagine it would suck in a car.