For Americans: Highway Classification

[Zorkaz]

How are the highways in the U.S. classificated? E.g. Autobahnen in Austria are like "A1", "A4", ect...

[Reneer]

Here's a brief overview which might be helpful (the link is Michigan-centric but provides a good summation).

[HadToRegister]

Also, odd numbers go from North and South, and even numbers go East and West.

Rt 66 (Route 66) goes East/West
Interstate 95 (I-95) goes North/South

[Zorkaz]

Thanks

[pepperman35]

Numbered Highways in the U.S.

[Tyanet]

Well it depends, there's a few levels to it.

 

 

Federal interstates are labeled I-XX (e.g. I-5, I-90), where the number depends on if it's east/west or north/south. They're the longest and fastest roads, and is probably most comparable to the autobahn type highways.

 

Then there's US Federal Highways, which are labeled US XX (US 66, US 206) and use the same rules as interstates. These can either be wide multilane highways, or two lane roads. Just depends on where you are.

 

Then there's state routes and state highways, which vary depending on the state. I like in Washington, and our state routes are named SR XX (SR 512, SR 7). Some other variations are: "Route XX", "SH XX", and "NY-XX" for New York. There's some additional oddities, but most follow one of those three formats.