Help on bridge law formula for semi dump

Show me on the Federal bridge chart where is takes into consideration axle 3 to axle 4. Or tell me where I can find the info for needing to know axle 3 to axle 4 weight.

 

You can do a tri-axle with a frameless trailer.
axle 1 to axle 5 51' for 80,000
Using the exception noted in the Federal chart: axle 2 to axle 5 36' or more for 68,000
axle 1 to axle 6 43' for 68,000
axle 2 to axle 6 32' for 68,000

 

I can tell you right now you'll be illegal. I live here in ohio and when I use to pull a 45' dump bed hauling only 80k I was pulled over all the time and over weight bc of that bridge formula. Your best bet is a 50' frameless

 

I agree with that, yea if you have the means a walking floor would be great. The only issue with that is how long it takes compared to dumping. Time is money. The cost of a walking bed probably cost more than a dump bed. Just have to weigh your options. I believe a 50' trailer not frameless would be perfect. The gravel pits around here allow us to haul 86k off the scale. The state police will give you an overweight ticket if caught

 

@Scalemaster
Can you shed light on this subject?

 

Driver earlier mentioned can he be legal with 80k with the tractor having a 250wb and a trailer that's 36' frameless.. I told him no way. Only way to make it legal I think would be 48'-50' dump trailer, Ive pulled short trailers and yea they can hold the weight but I was always over weight according to bridge law

 

Is that it? What about 28 feet in the air? Or 30 feet. 35? What's a few feet.

Minerals according to it's own weight per volume will cube out against whatever vehicle in weight capacity legally before it has a chance to fill all of the volume. I remember the Western Maryland Railroad and the B&O putting down a dab of iron ore in the ends of the hopper cars 55 ton capacity coal but since iron ore was so dense and heavy, they can only volume a portion of the total space before maxing out at 55 ton. It was not a problem because generally it came off Port ships going back west towards the mines anyway. Any freight is better than no freight.

I spent some time around ready mix plants. Most of the time it's 40 foot trailers that allow hauling for example Sand. It's really light compared to stone. And many of the dedicated rock haulers who do not expect to haul sand had 30 footers generally. Whatever rock they stick into the bin was what they got paid. The ready mix plant I worked for in that time was less than concerned with legal weights as well. Putting my 40 foot bulk tanker to 130K some days simply because there are no scales around to tell them not to do it.