Idaho spread?

If you look at the axle spacing the trandem is slid forward quite a ways compared to a normal quad. They call it an Idaho spread to meet the 5.5’ or 6.5’ off track laws for Idaho’s state roads. Look up idaho off track and it will make since.

 

Ok now that makes perfect sense as someone familiar with this specific Idaho law.

 

Idaho has some routes that require permits for 53 foot trailers. It used to be a three part permit, the chart, the maps and the actual permit. They have a system to calculate the trailer off track. This determines the routes you can use. They are color coded, black, green, red and blue. Depending on your chart, you can use any road up to your reference point.

 

Why are the axles spaced so far apart? I see a lot of quad axle trailers here in OR and most have normal spacing but some have the spacing like the trailer in the link. I assumed it was for running in Canada, as don’t some provinces like a 60” spread vs the traditional 54”? I’m guessing on the exact numbers here. But what would an Idaho tandem location do with the distance between the axles?
And can someone explain why it is hard to bridge out 105.5k in OR? There’s a lot of dump and pup trucks here with looong pull bars btw, so does that mean that OR wants more inside bridge?
Thanks for any info.

 

The tridem with the single tire lift axle at the rear? Not legal in Western Canada unless the rear lift axle is raised.

 

Oh, because western provinces don’t recognize lift axles, correct? So, would a maxi trailer with a lift axle on either side of a fixed tandem be a good idea in these parts?

 

Not really sure what a maxi trailer is to be honest. I'm only familiar with BC/AB configurations.

 

Unless I'm severely mistaken, you can carry as much on a tri in AB and BC as we can on a Quad in the US, if not a little more. Just lift the thing up at the border.

 

It’s just another name for the 4 axle trailers we’re discussing in this thread.

 

In short, yes. Oregon uses a different bridge formula than the rest of the nation, you know, because they are special.