Interstates and US routes w/o a duplex within a state

[Molandfreak]

Since state routes don't count I guess, Minnesota gains I-494 and I-35W (35W doesn't duplex with 94; it's solely a common section).

You forget that 35W and US 10 are concurrent in Arden Hills, so 35W would still be off the list.

And 494 is paired with MN 5 for a good stretch.

Can't believe I didn't catch that one.

You didn't miss MN 5. It was excluded because it was a state route.

(I still think state routes should count.)

So the list is (excluding state route concurrencies): U.S. 8, U.S. 69, I-494. The only route that qualifies including state routes is U.S. 69.

[froggie]

Thinking about this for Vermont...the only routes this would apply to are I-89 and I-189.  I-91 and I-93 technically have a TRUCK US 2 on them, and each of the US routes in the state has a concurrency with each other US route it crosses (US 2/302 don't count here as 302 doesn't cross 2).

[roadman65]

Vermont only has four junctions between all its US routes.  3 out of 4 is not bad for the US routes anyway.

Yes, the truck US 2 is the only holdback for giving the Green Mountain State a clean bill of health for Interstate/ US route concurrencies.

However, look at the bright side of things, still a perfect record for mainline US highways though.

[froggie]

Vermont only has four junctions between all its US routes.  3 out of 4 is not bad for the US routes anyway.

2/5
2/7
2/302
4/5
4/7
5/302

[yakra]

I-195 in Saco/OOB is the only interstate in Maine without any duplexes if you don't count the Falmouth Spur (hidden I-495). All other US and interstates in the state have at least one duplex somewhere along their routes.

Not quite: I-195 west does officially carry ME5 north. ME5 south is still on Ocean Park Rd.

[SSOWorld]

Exclusion of State Routes doesn't change WI's list.

[Duke87]

Since nobody has exhaustively run through Connecticut yet...

Interstates:
84 - nope, US 6/7/44/202
91 - yep
95 - nope, US 1
291 - yep
384 - yep
395 - yep if SRs don't count, nope if they do (CT 2A)
684 - yep
691 - yep

US routes:
1 - nope, I-95
5 - nope, US 44
6 - nope, I-84/US 7/44/202
7 - nope, I-84/US 6/44/202
44 - nope, I-84/US 6/7/202
202 - nope I-84/US 6/7/44

There's a pattern here.

[roadman65]

US 5 is concurrent with CT 15 south of Hartford.

[Duke87]

US 5 is concurrent with CT 15 south of Hartford.

I am aware, but that is irrelevant since its concurrency with US 44 disqualifies it and the OP said concurrencies with state highways don't count.