Axle weights

I think it's 650# per inch of tire width limited by axle rating I'm 14,500 empty with an 11R tire and I've never been hassled.

 

It is in Ohio.

For the rest of the states it varies from 550 (ND) to 700 (KY, MI). Some states are by axle weight at 12,000, a lot are 20,000, NY is 22,400, and a lot are not specified... harmony.

 

Where to begin...?

Some of this has already been addressed by @Ubu, but it bears repeating.

No, the Rand-McNally Motor Carriers' Road Atlas is not a federal document.

Weights and dimensions, as previously noted, can be separated into two broad categories; national (Interstates) and state/provincial. The national network section in the R-M Atlas does not reference steer axles specifically, but does say "single axle." The vast majority of states have an Interstate, single axle, limit of 20,000 lbs., but some go beyond that--to as much as 22,400/500. The state/provincial section is summarized in Post #22 and by adding: regardless of what type of road, do not let your axle weight exceed the lesser of; axle, tire or regulatory limits. If you exceed the lesser limit, you are a prime candidate for an unhappy day.

Similarly, tandem axle limits vary somewhat as does the gross weight limit--although there are fewer exceptions in these two categories.

Suffice to say it is best to follow the nominal limits of 12,000, 34,000, 34,000 (40,000 for qualifying spread), 80,000, unless you are well-read and well-versed on the exceptions for where you drive.

Lastly, lots of drivers mention bridge laws when what they really mean is the kingpin to rear axle (KPRA)... know the difference.

And I've never gotten an overweight ticket... even when I was.