Useless Multiplexes

[hotdogPi]

I-393 in New Hampshire.

It's concurrent with 4, 9, and 202.

[Big John]

 IL/MO 110 

[Rover_0]

3) WY 789/US 310, WY 789/US 14/16/20 WY789/US 16/20, WY 789/US 20, WY 789/US 287, WY 789/I-80/US 30 Too many multiplexes for WY 789. I don't know why WY 789 is duplexed all the way to the MT border with US 310.
In fact, let US 310 take over WY 789 and CO 13 all the way to I-70 at Rifle. Plus WY 789 could take a more direct route along WY 135 between Riverton & Jeffrey City.

I seem to remember some discussion on this forum (or maybe elsewhere) that WY 789 was planned to be part of a multi-state Highway 789, but the other states involved either didn't get on board with the idea or discontinued their portions.

Actually, I think it was planned to be a border-to-border US-789 (Montana-Wyoming-Colorado-New Mexico-Arizona), but was ultimately rejected by AASHTO because too much of its length ran concurrent with other U.S. Routes.

[hbelkins]

Missouri has several. 96 and 571 comes to mind, as does 39 and 265.

[corco]

Actually, I think it was planned to be a border-to-border US-789 (Montana-Wyoming-Colorado-New Mexico-Arizona), but was ultimately rejected by AASHTO because too much of its length ran concurrent with other U.S. Routes.

Right. Wyoming presumably kept it because it gives a logical north south number to a bunch of east-west highways that run north-south in a populated part of the state. It's a lot easier to give somebody directions from Rawlins to Worland or something with 789 in place. (though why 789 isn't routed up WYO 135 is another discussion)

[Molandfreak]

Actually, I think it was planned to be a border-to-border US-789 (Montana-Wyoming-Colorado-New Mexico-Arizona), but was ultimately rejected by AASHTO because too much of its length ran concurrent with other U.S. Routes.

Right. Wyoming presumably kept it because it gives a logical north south number to a bunch of east-west highways that run north-south in a populated part of the state. It's a lot easier to give somebody directions from Rawlins to Worland or something with 789 in place. (though why 789 isn't routed up WYO 135 is another discussion)

Is Lander very important to the route? Maybe 135 wasn't in good condition at the time WY 789 was commissioned.

[froggie]

I-393 in New Hampshire.

It's concurrent with 4, 9, and 202.

I-393 is also the only reason that segment of freeway was built to begin with.  I doubt NHDOT would have fronted the funds for it if they didn't have access to Interstate construction money.

[Roadsguy]

US 202 in Delaware, practically, ends at I-95, but the number follows I-95 and DE 141 to end at US 40.

Even weirder, and certainly causing a bit of confusion, DE 202 (once part of the US route) continues along the road south of I-95 to end at US 13 in Wilmington.