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[hbelkins]

If sheer numbers are the definition of "insane" here, I haven't yet been able to come up with a segment of roadway in Kentucky with more than five concurrent routes -- US 23, US 119, US 460, KY 80, and KY 1426 for a short segment in Pikeville.

Best I can do for West Virginia is four -- US 33, US 48, US 250, and WV 92 west of Elkins, and US 219, US 250, WV 55, and WV 92 south of Elkins. There's also US 33, US 219, US 250, and WV 92 through downtown.

[ran4sh]

How many of these are signed (such as the Folkston example)?  I don't think all the routes on I-465 are.  A mega sign salad is more interesting to me than the legal or practical definitions.

Although 10 Loop in Georgia has some unsigned routes on its 8-route concurrency, there are signs with all four US route shields on them so it would still count as 5 routes (US 29-78-129-441 on BGS, SR 10 Loop on an independent shield) if ignoring the unsigned.

Plus there's definitely "sign salad" on the intersecting roads rather than 10 Loop itself

[bing101]

About the best you’ll get in California is the largely silently concurrent CA 99-59-140 briefly in Merced.

Up until Business 80 in Sacramento was truncated to the Oak Park Interchange, the WX Freeway carried Business 80, Route 99, and US 50 (and is that hidden I-305 designation as well).

Currently Business 80 is concurrent with CA-51.

[TheHighwayMan394]

Minnesota has a fully signed US/county freeway duplex with US 52 and CSAH 12 in Olmsted County (the US 169/Hennepin CSAH 1 freeway duplex, however, is not signed)

[Jim]

Insane concurrency in Greensboro, North Carolina.  May 21, 2005.



Sadly, we're not also going East at this point.

[dfilpus]

Insane concurrency in Greensboro, North Carolina.  May 21, 2005.



Sadly, we're not also going East at this point.

This multiplex is being dismantled. US 421 is no longer on this multiplex. US 70 has been approved to be removed from this multiplex. Business I 85 is in the queue to be decommissioned.

[US 89]

Insane concurrency in Greensboro, North Carolina.  May 21, 2005.



Sadly, we're not also going East at this point.

This multiplex is being dismantled. US 421 is no longer on this multiplex. US 70 has been approved to be removed from this multiplex. Business I 85 is in the queue to be decommissioned.

Most of that is news to me. What’s happening to 70? If they’re just rerouting it to the south on 85 and then sending it up old US 421, that doesn’t make much sense to me as that’s longer than its current route. As for decommissioning BL-85, is the idea to keep all through traffic bypassed to the south, and then sign the stretch that isn’t on I-40 as just US 29?

[Henry]

I-77/I-81/US 11/US 52 is one crazy concurrency, because for each direction, an Interstate and a US route go the opposite way. Not to mention that the whole thing runs east-west for 9 miles!

[frankenroad]

Maybe not the most insane, but definitely weird.  In Florence, KY, US-25 joins US-42 and US-127 (which are multiplexed for about 20 miles south of Florence, KY).  The triple multiplex then proceeds north through Covington, KY, and onto the Clay Wade Bailey Bridge into downtown Cincinnati.  At the north end of the bridge, where the state line is, US-25 disappears because Ohio de-commissioned it years ago. 

I wonder why KY did not just truncate 25 where it meets 42/127.

[OCGuy81]

I feel the Milwaukee bypass deserves a mention. You've got Interstates 41, 43, and 894 alongside US 41.

It's certainly unique in that 41 and 43 are opposite directions, AND Interstate 41 is signed with US 41.

[Big John]

For Wisconsin, a 5-way concurrency by Waupaca, which includes a county highway: https://goo.gl/maps/jMALjKqfR9Q8JCyj9

[Hobart]

I feel the Milwaukee bypass deserves a mention. You've got Interstates 41, 43, and 894 alongside US 41.

It's certainly unique in that 41 and 43 are opposite directions, AND Interstate 41 is signed with US 41.

To add to that, I-894 is concurrent with I-41 for its entire length, which includes this section.

[DJ Particle]

Minnesota has a fully signed US/county freeway duplex with US 52 and CSAH 12 in Olmsted County (the US 169/Hennepin CSAH 1 freeway duplex, however, is not signed)

If we're going unsigned, there's I-94/US-12/US-52/MN-55 in downtown Minneapolis  🤣

[TheHighwayMan394]

Minnesota has a fully signed US/county freeway duplex with US 52 and CSAH 12 in Olmsted County (the US 169/Hennepin CSAH 1 freeway duplex, however, is not signed)

If we're going unsigned, there's I-94/US-12/US-52/MN-55 in downtown Minneapolis  🤣

And I-94/US 52/US 59/MN 210, but since a signed triplex isn't that cool unless it's all-interstates or other weird stuff, I didn't include it.

[thspfc]

In Windsor, CTH-CV runs east/west along WI-19 then turns at an interchange to run north/south along US-51 before splitting off just south of I-39/90/94.

[KeithE4Phx]

If we’re using another definition of “insane”, US 60/70 pre-interstates could qualify too.

West to east, that concurrency was 4 highways between Wickenburg and downtown Phoenix (US 60/70/89/AZ 93), picking up US 80 downtown.  It was a 5-way (US 60/70/80/89/AZ 93) between downtown Phoenix and downtown Mesa, where 93 joined AZ 87 heading south. 

Between downtown Mesa and Florence Jct, the four US highways were concurrent (there are a few "Historic" signs along E. Main St. in east Mesa showing the four).  US 60/70 continued to Globe, where they split, and US 80/89 continued to Tucson, where they split.

[Mapmikey]

Insane concurrency in Greensboro, North Carolina.  May 21, 2005.



Sadly, we're not also going East at this point.

This multiplex is being dismantled. US 421 is no longer on this multiplex. US 70 has been approved to be removed from this multiplex. Business I 85 is in the queue to be decommissioned.

Most of that is news to me. What’s happening to 70? If they’re just rerouting it to the south on 85 and then sending it up old US 421, that doesn’t make much sense to me as that’s longer than its current route. As for decommissioning BL-85, is the idea to keep all through traffic bypassed to the south, and then sign the stretch that isn’t on I-40 as just US 29?

US 70 is being rerouted at High Point to follow NC 68 then Wendover Ave across northern Greensboro.

[Flint1979]

Michigan doesn't really have a ton of concurrencies. Most of the time a route will just terminate instead of running on a concurrency but they do exist. I can't think of any off the top of my head that have three routes on one roadway but there's several that have two usually the concurrencies aren't very long either. I think I-75 and US 23 between Standish and Flint at 73 miles might be the longest one in the state.

[hobsini2]

Prior to around 2012, Delphi, IN was home to a concurrency of US 421 and SR 18, 39, and a wrongway concurrency with SR 25, for about 10 blocks.  SR 25 being Main Street.


I-80/90 and I-39/90/94 are a couple of more notable crazy concurrencies.

A crazy concurrency does not necessarily mean a long concurrency. 80/90 makes sense as does the 39/90/94 in the big picture of things.

[skluth]

I feel the Milwaukee bypass deserves a mention. You've got Interstates 41, 43, and 894 alongside US 41.

It's certainly unique in that 41 and 43 are opposite directions, AND Interstate 41 is signed with US 41.

To add to that, I-894 is concurrent with I-41 for its entire length, which includes this section.

That's because they didn't want the I-39/90/94 concurrency to be the only interstate triplex in the country

[bulldog1979]

Michigan doesn't really have a ton of concurrencies. Most of the time a route will just terminate instead of running on a concurrency but they do exist. I can't think of any off the top of my head that have three routes on one roadway but there's several that have two usually the concurrencies aren't very long either. I think I-75 and US 23 between Standish and Flint at 73 miles might be the longest one in the state.

Michigan has five extant three-way concurrencies: US 2/US 141/M-95 in Iron Mountain, US 2/US 41/M-35 between Escanaba and Gladstone, US 31/M-37/M-72 in Traverse City, US 131/M-66/M-72 in Kalkaska and BL I-94/Bus. US 127/M-50 in Jackson. The BL I-94/Bus. US 131/M-43 concurrency in Kalamazoo was the most recent one eliminated.

[Dirt Roads]

Mentioned before by someone else* here on AARoads long ago, but the US-119 overlap onto US-33 between Spencer and Buckhannon, West Virginia has got to be the wackiest looking concurrency on the map.  This is essentially the same routing as when US-119 was extended southward from Morgantown in 1935 (except the portion replaced by Corridor H between I-79 and Buckhannon, which is only a minor change).  The West Virginia State Road Commission wasn't interested in extending US-119 southward, but that may have not had anything to do with this wacky concurrency.

Anyhow, this east-west concurrency is approximately 85 miles long and crosses several other north-south routes along the way, including its parent (US-19).  But it all makes more sense when you do the mileage.  Charleston -to- Buckhannon via the "old road" (US-119/WV-4/US-19/WV-4/WV-20, essentially the same route as the old cross-state WV-4) is about 135 miles of winding roads.  Charleston -to- Buckhannon via the current US-119 is only a few miles longer over slightly tougher terrain, but much less windy.

For the record, nowadays the best route from Charleston -to- Buckhannon via I-79 and Corridor H is only about 114 miles and takes about 94 minutes.  You can theoretically cut off a minute by getting off at Flatwoods and taking the "old road" to Buckhannon, but I wouldn't bother.  Unless you want to visit the State Wildlife Center in French Creek.

*I seem to recall that hbelkins made such a comment, but I'm not sure.

[formulanone]

There's also the silent four-way concurrency in Knoxville, Tennessee:

Resurrecting the thread because I found one (albeit not fully signed):

This is in eastern Knoxville TN - https://goo.gl/maps/cj9wGmvQSussrjeo6

You are on US 11E south, US 25W north, US 70 west, and unsigned TN 9 north.  The sign says TN 168 west is to the left.

TN 168 east is also (unsigned) straight ahead.

TN 168 was extended over US 11E-70 when US 25W was moved to I-40 and 640.  Though not necessary, TN 9 was also moved with it.  Thus there was no state designation on US 11E-70 west of I-40.  They put TN 168 on it.  Maps show this and there is a TN 168 mile posting at the US 11E-11W split - https://goo.gl/maps/whkXNQMejqRuBz4U9

So while not posted, it does exist on a 0.9 mile stretch of highway in Tennessee.

[paulthemapguy]

I-41's concurrency with I-94 south of Milwaukee.  I-41. has. no. reason. to. continue. south. of. Milwaukee.  Illinois is never going to buy it.  It's stupid.  Drop it, WisDOT.

[Henry]

I-41's concurrency with I-94 south of Milwaukee.  I-41. has. no. reason. to. continue. south. of. Milwaukee.  Illinois is never going to buy it.  It's stupid.  Drop it, WisDOT.

I tend to agree with that assessment, as I-41 will never be extended all the way to Chicago (at least not in our lifetimes anyway). If WisDOT really was hellbent on getting rid of I-894, it could've just ended I-41 at the point where it meets I-43, and called it a day.