Posted by Geo-TH,In on July 16, 2016 at 05:16:55 from (172.78.30.199):
I don't want to side track the post below about towing 11 tons, so I'll start my own.
I like to haul things the right way, so I've asked hard questions in the past. That gives some the opinion I don't care and I'm an accident ready happen.
Here is a copy of the DOT regulation I found interesting.
FMCSA requires that cargo securement systems be capable of withstanding the forces associated with following three deceleration/accelerations, applied separately: 1.0.8 g deceleration in the forward direction; 2.0.5 g acceleration in the rearward direction; and 3.0.5 g acceleration in a lateral direction.
These values were chosen based on researchers' analysis of studies concerning commercial motor vehicle performance. The analysis indicated that the highest deceleration likely for an empty or lightly loaded vehicle with an antilock brake system, all brakes properly adjusted, and warmed to provide optimal braking performance, is in the range of 0.8-0.85 g.
If I'm reading the regulations right, the two chains and D rings preventing load form moving forward have to be able to withstand 0.8g's. What that means the chains must be strong enough to withstand 80% the weight of the tractor. That's going to be a big chain and some strong D ring isn't it?
A 10,000# tractor would need 8000# chain and rings.
A 20,000# tractor would need a 16,000# chain and rings.
My question is do they make chains and D rings that strong? IF so what are they called?
Keep in mind DOT came up 0.8g's based on braking only. All bets are off if you are in an accident, the g value is many times the value of gravity. I can see if you were hit a tree with truck, come to a sudden stop, it won't take long before the tractor you are towing is going to hit you in the back of the head.
So, are we all using strong enough chains?
I use 3/8 G70 chains on my tractors which are between 3-4000#. D rings on my sur-track trailer look like 1/2 inch. Are they strong enough for DOT? I don't think too many things are strong enough if I come to a sudden stop, so I'm going off roading instead of having a head on.
Footnote: I've asked in the past, why aren't the cops stopping landscapers who pull 3 Dixie choppers, no straps, advertisement on truck, no DOT's.
This answer may not be accurate, it came from a retired trucker who has a son who is a DOT inspector and the other is a State cop. I was told only cops with an Indiana DOT certificate can stop you and inspect your load. Any cop can be certified, but their department will need to send you to school to get one. Our city and county boys are not certified, only some state boys are. In the past Indiana had DOT and State cops. DOT boys didn't carry guns. New DOT boys are also state cops, can write tickets and pack heat.
Retired trucker told me if any cop stops me, just politely ask to see his DOT certificate. This is just hear say, may not be accurate. Best answer I've gotten when I ask why aren't my cops doing their job. When in reality it isn't their job unless they are certified.
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