Posted by MarkB_MI on July 17, 2016 at 03:52:30 from (70.194.0.244):
In Reply to: Re: DOT?? posted by jon f mn on July 16, 2016 at 17:04:24:
150 percent of payload weight is nowhere near enough to withstand the acceleration forces of a head-on collision.
I looked up to see how strong passenger seat belts are required to be. Lap belts are required to handle 26,689 newtons before breaking. Which works out to 6000 pounds. Which we can double to 12,000 pounds since there are two attachment points. A 300 pound passenger would have to decelerate at 40 Gs to generate 12,000 pounds. Of course the passenger is going to sustain significant injuries at 40 Gs. But a 10 G crash is certainly survivable if you're restrained. And there's simply no practical way to tie down a heavy load so it can stand a 10 G crash.
Fortunately it would be a rare truck crash that generates 10 Gs. Unless you hit a stationary object or another truck, the truck's mass will be heavier than whatever it hits, so its momentum will continue to carry it forward through the crash, reducing the deceleration.
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