Roads that are also compounds

[hotdogPi]

NH3 (ammonia) almost works. The only reason why it doesn't is because Route 3 in New Hampshire is US 3, not NH 3.

NH4 exists as a route, but it is a positively charged ion (ammonium), not a full compound.

Are there any that are both routes and compounds?

[NE2]

I'm not doing your chemistry homework for you.

[Mapmikey]

OH2 and OH3

[1995hoo]

If H20 denotes two molecules of hydrogen and one of oxygen, then I suppose H-201, when pronounced the way most people pronounce it, could be considered a more specific way of naming water even if using the "1" is not conventional chemical notation. (Seriously, I've never met anyone who pronounces road numbers as "two-zero-one," it's always "two-oh-one.")


(Edited to fix a punctuation error)

[robbones]

That would exclude all Arkansas highways since Ar is an element.

[Mapmikey]

There is also CO-2 and you should roll down your windows for plenty of air when driving CO-1...

[vdeane]

I-2.  Also (I-)H2.

[theline]

I'm thinking that all those subdivision streets like Springdale, Parkview, Southbrook, and Stonehedge would work. After all, they are compound words. 

[Alps]

I-2.  Also (I-)H2.

I-H1 actually, since Hydrogen Iodide.
US2 is apparently a thing. There are two of those.


EDIT: NB-1. Was trying to get something like "NH-1B" but it's ruined by the H. NH-1C would work, but it doesn't exist.
EDIT2: ON-Mb 1 would also work, but Ontario just refuses to cooperate and renumber 17. ON-2 certainly works.

[TheCatalyst31]

There is also CO-2 and you should roll down your windows for plenty of air when driving CO-1...

CO3 and CO5 work too. As would CO4 and CO6 if they were still highways.

[SSOWorld]

N2 in Nebraska.

[Takumi]

US2 is apparently a thing.

As is US3. Also apparently.

[jp the roadgeek]

I'm sure there are plenty of dairy farms along CA 20.

[SignGeek101]

Rh Way at the university of Manitoba.

[Duke87]

And here I was thinking this thread would be about prison driveways.

[Road Hog]

That would exclude all Arkansas highways since Ar is an element.

Argon is a noble gas and doesn't form compounds.

(At least not in nature, after reading up on it.)

[US71]

NH3 (ammonia) almost works. The only reason why it doesn't is because Route 3 in New Hampshire is US 3, not NH 3.

NH4 exists as a route, but it is a positively charged ion (ammonium), not a full compound.

Are there any that are both routes and compounds?

Compound W , Missouri Secondary Route W

[vdeane]

I believe SC 203 has not yet been mentioned.  Also: http://www.webelements.com/compounds/