I have heard a fully loaded concrete truck (about 7 yards?) is the heaviest vehicle on the road. The reason I ask is, on the way home I saw a concrete truck overturned on the side of the road. They had several large tow trucks on the site trying to get the truck upright and out of the ditch.
No. A full oaded 18 wheeler is far heavier (80,000 Lbs or so). A concrete truck my be the heaviest for it size, but not the heaviest overall.
Concrete trucks have to follow the same laws as anyone else. Check the licence. It will tell you the legal weight allowed .
Either the driver was an idiot or he was just following the directions of someone telling him how to back into a pouring site. Things get pretty close to the edge because the laborers don’t want to move loose concrete any further than they have to.
There is a pretty good chance he doesn’t work there anymore.
This does not answer the question at all…
Well, if you could get it on a road, the Crawler, (basically a bunch of caterpillar tracks under a flat surface) which transports the Space Shuttle from the VAB to the launch pad weighs 2700 tons (unladen).
If you’re talking about road-legal, there are several different types of heavy semi-articulated trucks, like those used to transport concrete bridge pylons and such, which weigh in over 100,000 lbs. unladen.
(loaded)
Most states’ legal loads are limited by the FHWA bridge formula, see this reference . Michigan happens to have a grandfather clause and allows legal loads for an 11 axle truck of 77 tons. In addition there is a legal 86 ton vehicle configuration. In addition, permits for overloads have no limit other than the capacities of the bridges on the routes- I have seen permit vehicles over 500 tons.
The idea is that heavy equipment tears up the roads. Spreading weight over lots of tires helps.
When I was driving, the heaviest load I ever had was 93,000; some 13,000 over legal. I was hauling rice from the fields. There’s no scale in a rice field and the first load has an unknown percentage of water.
A real trucker would scoff at my puny loads. There’s some big haulding going on out there.
Quote Furt
This does not answer the question at all…
Then you must not understand the question.And you’ve never had the weigh boys stop you.
First concrete weighs about 1 ton a yard. Actually slightly less.
A 7 yard truck will hold about 8.5 yards but some will spill going up hills ,stop signs etc.
A 7 yard truck is a small one now-a-days.
A typical road train with a combined weight of 1,072.3 tonnes (2.364 million lb).
OK not heaviest but topical. Yesterday a road rolled over. 22 tonnes of bannanas had to be put-down. 
Great info everyone, thanks. Maybe I should have said, heaviest vehicle with less that 18 wheels. 
You know that’s not really a “typical” road train right?
On road construction gangs sometimes the concrete is mixed on site.They use dump style concrete haulers. They generally have oversize tires .That lessens the psi on the road surface. I don’t know how much they are able to haul but there probably isn’t a load limit on them.Hell they probably aren’t even licenced.
First , to Berkut’s link: :eek:
here is some bridge beams being transported for the new Mississippi River bridge in LaCrosse:
http://www.dot.wisconsin.gov/projects/d5/mriver/images/nextsection.jpg
http://www.dot.wisconsin.gov/projects/d5/mriver/images/backup.jpg
Project website:
http://www.dot.wisconsin.gov/projects/d5/mriver/index.htm
Brian