Idaho SR-55 bridge warning
A heads up to all RVers using SR-55 through Cascade. DOT has reduced the axle weight for ALL vehicles on the north bridge to 9K/axle and will be further reducing it to 6K/axle this week. They are seri...
Forum Discussion
Haulinhazmat wrote:
Correct me if I'm wrong but with a weight limit of 9 tons per axle a tractor trailer combo with 5 axles could
Weigh 90 thousand lbs and cross this bridge. A MH weighs about 50 thou. Could not cross . Right
Or wrong
Almost correct. The front axle on a semi-truck (as well as most class As) is limited to only 6 tons. Each tandem (pair) set is limited to 17 tons due to their proximity to each other (not their individual weight ratings). This gives 34+6, or 40 tons.
Now, a wiggle wagon (double trailer) would have 6(f), 17(d), 10(t), 10(cd), 10(t), or the ability to hit a max of 53T (reality would be still limited to 40T, as they would be hard-pressed to hit the max weights per axle).
the question I would have is if the 9T limit applied to tandems, or if 17T is still acceptable. Those with a tag on their MH would need to know this, as the tag counts in a tandem calculation.
