Map questions.

The shortest does not mean the fastest or best route.

Other than that, what the heck are you talking about?

 

STAA routes are minimum 12 ft wide lanes with minimum 13'6" clearances. They are designated high truck traffic routes. If it's not marked as STAA, it may only be 9' or 10' lanes, but otherwise, no reason you can't be on it. It should be marked as restricted or with low clearances if you aren't allowed on it, with few exceptions. Then again, just because you CAN be on the road, doesn't necessarily mean you SHOULD be.

 

National Network - Wikipedia

 

US 550 is a prime example where the powers that be seemed to stop working [about 25 years ago] designating "approved routes" I much prefer routing through Cuba as opposed to via Gallup.

But probably the standards need to be modified slightly, then redo the maps but I don't expect this to happen

There are a good number of prudent and sensible route options across the US that are not highlighted. Just look for specific restrictions, ask questions, and use common sense.

 

ans I should supplement my prior reply with this reply.

There are lots of non-highlited roads where 53-102 trailers will get ticketed regularly, especially in northeastern states and California.

 

STAA routes unless noted are good for at least 13'6" 102 wide and 53' trailers. Some states like TN and NY are 48' states, whereas being off a STAA route more than 1 mile in NY with a trailer longer then 48" can catch you an overlength ticket.