HAZMAT trip planning?

Er... The Law doing the detouring should spot your diamonds and come up with a alternative for you. It would be in cases where you have had a fatal or high injury life flight or something that closed I640 in your face.

You cannot take a hazmat load with diamonds on your truck into banned non HM routes. You just cannot. With that in mind and your scenario, if the fire dept is standing on your tank telling you to divert to 40, you tell em hell no, you are hazmat your truck does NOT go on 40. And you stay put until the Fire Chief gets involved and more Law etc makes a decision about you.

 

What exactly is unplacarded hazmat? It either is or isn’t a placard load. There aren’t too many route restrictions to be honest, mostly it’s just using beltways around cities. Just check your atlas or the web. Here is what I use:

National Hazardous Materials Route Registry - By State

 

You are over thinking this. Either have to follow all hazmat rules for placards and routing if you are carrying enough of said product to trigger the hazmat regs or you are not.
If you don't carry enough product to trigger placards, you are treated as any other unremarkable load.

 

Yeah, this one is bumming me out. It's like a chicken or the egg question, Zvar..

 

for domestic transport in the US if it’s not placarded then there is no route restriction plain and simple.

 

Unplacared hazmat is peanut butter without any jelly now does it make sense to you