Recurring concurrencies

[TheStranger]

One of those "basic topics of trivium" I thought about last night looking at my most recent copy of the Rand McNally atlas...a couple come to mind immediately:

- I-90/I-94 in Madison and in Chicago
- Routes 93 and 95 across national borders!  (one towards Golden, BC, and US 93/95 in Las Vegas/Boulder City)
- US 40 and I-70 in various points across the Midwest

Out of the initial query comes two related questions:

- What's the longest distance between two routes' concurrencies?  (I'm thinking 93/95 above might earn that distinction)
- What's the most instances of two routes running with each other on the same alignment?  In California, I think it has to be Route 1 with US 101 (Exit 62B in Ventura northwest to the "Pacific Coast Highway" exit approximately mile marker 73, Exit 78 northwest to Exit 132 in Gaviota via Santa Barbara, Exit 191A in Pismo Beach to milemarker 204 in San Luis Obispo, San Francisco Presidio north across the Golden Gate Bridge to Sausalito/Marin City) with four.

[hbelkins]

I would have to study on this, but I can say that US 60 and US 62 have three concurrencies in Kentucky alone.

From the west, they enter from Illinois with US 51 and split. They come back together in Paducah and split east of town. Then they have a short "wrong-way" concurrency in Versailles, where US 60 east is US 62 west.

[corco]

US-20/26 happens a lot- from Vale OR to Mountain Home ID, then from Carey ID to Atomic City ID, then from Shoshoni WY to Orin Junction Wyoming. If you count US-20 business, then mainline 26 has a brief concurrency with US-20 business in Idaho Falls as well.

There's tons of Interstate/US Route deals where that happens (I-80/US-30, I-84/US-30 etc)

[jdb1234]

US 90 and US 98 have 3, two in Mobile and one in Pensacola.

US 78 and US 278 have concurrencies in Atlanta and Augusta, and used to have a wrong way one between Guin, AL and Hamilton, AL.

[Bryant5493]

Georgia State Route 20 and 81 have concurrencies in McDonough and again, shortly, in Loganville.

U.S. 29 and 78 have concurrencies from Northside Drive (U.S. 19/41/S.R. 3) in west Atlanta to just west of North DeKalb Mall, west of I-285. They come together again in Oconee County, near U.G.A.


Be well,

Bryant

[jdb1234]

US 64 and 72 in both Chattanooga and Memphis

US 23 and 129 in Macon and Gainesville, GA

[OracleUsr]

Used to be one US 64/264 from Raleigh to Zebulon, then Manns Harbor to Whalebone Junction, but US 264 is truncated back to its intersection with US 64 near Mann's Harbor.

[Scott5114]

I-35/US 77 enter Oklahoma, then split at Exit 1. Then they concur between Norman and downtown OKC, where 77 splits off to follow I-235 and its own freeway, then in Edmond it follows old US-66 back to I-35 and concurs again to Guthrie!

US-377/OK-99 concur with OK-3 southeast of Ada. The two follow separate routes around Ada, but on the northwest side of town, half of OK-3 reunites with US-377 and OK-99–it had split into 3E and 3W by this point. US-377/OK-3E/99 stay together until Seminole.

[wytout]

US6 and I 84 are concurrent 3 different times in CT.  First time is just east of Danbury for about 4 miles, then again for about 6.5 miles between Newtown and Southbury, and again It gains concurrency in Farmington running east together all the way through W. Hartford, Hartford, E. Hartford, and into manchester, where concurrency breaks for the last time in CT.

[US71]

US 71/US 59 in Missouri & Arkansas

[froggie]

- What's the longest distance between two routes' concurrencies?  (I'm thinking 93/95 above might earn that distinction)

Although not quite as long as the 1100-some miles for 93/95, US 26 and US 30 go about 815 miles in between their concurrencies at Bliss, ID and Ogallala, NE.

- What's the most instances of two routes running with each other on the same alignment?  In California, I think it has to be Route 1 with US 101

Within Virginia, I-64 and US 60 have 3 separate concurrencies.

[agentsteel53]

Although not quite as long as the 1100-some miles for 93/95, US 26 and US 30 go about 815 miles in between their concurrencies at Bliss, ID and Ogallala, NE.

hell of a long concurrency in Ogallala!   precisely one block, and only the eastbound (heading south) branch of the US-26 one-way pair.

I had to look that one up, as I had thought US-26 ended at US-30.  Nope, nowadays it ends at I-80 just a bit south of US-30.

[bugo]

US 64/412 have 3 duplexes in Oklahoma.

[CL]

US-6 and US-50 have two concurrencies in Utah.

[Bickendan]

I-84 and US 30 is in the running for the most concurrencies: Portland to Cascade Locks, Cascade Locks to Hood River, Hood River to Rowena, The Dalles to Pendleton, Pendleton to La Grande, La Grande to North Powder, Baker to Huntington, Huntington to Ontario, New Plymouth to Bliss, Burley to I-86, at which point I-84 goes 'To Hell with it, I'm going to Utah!': 10 concurrencies

If you count CA/OR/WA99 as a single continuous route (which it isn't anymore, I know), you'd have a good number between it and I-5: Sacramento, Red Bluff to Ashland, Central Point to Gold Hill, Grants Pass to Myrtle Creek, Myrtle Creek to Winston, Oakland to Yoncalla, Curtin to Cottage Grove, Goshen to Eugene, (OR99E: Albany to Salem), Portland to Vancouver (assuming old surface routing through Vancouver to Hazel Dell), Hazel Dell/Salmon Creek to Tacoma (not counting Bus I-5 in Centralia...): 11 concurrencies

For reference: CA 1/US 101: Oxnard to Ventura, Faria to Las Cruces, Pismo Beach to San Luis Obisbo, San Francisco to Marin City: 4 concurrencies.

[Bryant5493]

This isn't a recurring concurrency, but Georgia State Route 13 is co-signed with U.S. 23 from Clairmont Road (S.R. 155) to Buford Drive (S.R. 20), where U.S. 23 begins to follow Buford Drive (S.R. 20) to I-985/S.R. 365 (Lanier Pkwy.). S.R. 13 has a newly-opened interchange (exit 17) with I-985/U.S. 23/S.R. 365, in Oakwood. Oakwood's just south of Gainesville.


Be well,

Bryant

[xonhulu]

I-84 and US 30 is in the running for the most concurrencies: Portland to Cascade Locks, Cascade Locks to Hood River, Hood River to Rowena, The Dalles to Pendleton, Pendleton to La Grande, La Grande to North Powder, Baker to Huntington, Huntington to Ontario, New Plymouth to Bliss, Burley to I-86, at which point I-84 goes 'To Hell with it, I'm going to Utah!': 10 concurrencies

Thanks to Oregon's practice of treating US 30 as I-84's business loops, which other states don't do, this is unlikely to be topped.  BTW, your 3rd should read "Hood River to Mosier."

If you count CA/OR/WA99 as a single continuous route (which it isn't anymore, I know), you'd have a good number between it and I-5: Sacramento, Red Bluff to Ashland, Central Point to Gold Hill, Grants Pass to Myrtle Creek, Myrtle Creek to Winston, Oakland to Yoncalla, Curtin to Cottage Grove, Goshen to Eugene, (OR99E: Albany to Salem), Portland to Vancouver (assuming old surface routing through Vancouver to Hazel Dell), Hazel Dell/Salmon Creek to Tacoma (not counting Bus I-5 in Centralia...): 11 concurrencies

This is a stretch, or could at best be considered a historical high.  OR 99 probably can be considered still a continuous route, albeit unsigned when it's on I-5.  Also, even though ODOT has those routes in Douglas County on the books, the roads are no longer state-maintained and the county doesn't sign OR 99 on them.  However, the directional signage on the freeway still identifies them as OR 99, so I still consider them OR 99.  I can also buy 99E being part of 99, so I'd agree you can count all the Oregon ones plus the Sacramento concurrency with CA 99, but the rest aren't legit anymore, so this is at best 8 concurrencies by my count.

[74/171FAN]

I-95 and US 17 in the Hardeeville, SC area and in Fredericksburg, VA

[corco]

Although not quite as long as the 1100-some miles for 93/95, US 26 and US 30 go about 815 miles in between their concurrencies at Bliss, ID and Ogallala, NE.

hell of a long concurrency in Ogallala!   precisely one block, and only the eastbound (heading south) branch of the US-26 one-way pair.

I had to look that one up, as I had thought US-26 ended at US-30.  Nope, nowadays it ends at I-80 just a bit south of US-30.

It's actually a little bit longer now- I double took and had to look through my photos when I saw that. US-26/N-61 was routed onto the road by the airport and no longer runs through downtown Ogallala. 26 then follows 30 before splitting again to head down to I-80 with N-61

[Bickendan]

I-84 and US 30 is in the running for the most concurrencies: Portland to Cascade Locks, Cascade Locks to Hood River, Hood River to Rowena, The Dalles to Pendleton, Pendleton to La Grande, La Grande to North Powder, Baker to Huntington, Huntington to Ontario, New Plymouth to Bliss, Burley to I-86, at which point I-84 goes 'To Hell with it, I'm going to Utah!': 10 concurrencies

Thanks to Oregon's practice of treating US 30 as I-84's business loops, which other states don't do, this is unlikely to be topped.  BTW, your 3rd should read "Hood River to Mosier."

Whoops. You're right, it is Mosier. I know why Rowena popped into my head, though.

If you count CA/OR/WA99 as a single continuous route (which it isn't anymore, I know), you'd have a good number between it and I-5: Sacramento, Red Bluff to Ashland, Central Point to Gold Hill, Grants Pass to Myrtle Creek, Myrtle Creek to Winston, Oakland to Yoncalla, Curtin to Cottage Grove, Goshen to Eugene, (OR99E: Albany to Salem), Portland to Vancouver (assuming old surface routing through Vancouver to Hazel Dell), Hazel Dell/Salmon Creek to Tacoma (not counting Bus I-5 in Centralia...): 11 concurrencies

This is a stretch, or could at best be considered a historical high.  OR 99 probably can be considered still a continuous route, albeit unsigned when it's on I-5.  Also, even though ODOT has those routes in Douglas County on the books, the roads are no longer state-maintained and the county doesn't sign OR 99 on them.  However, the directional signage on the freeway still identifies them as OR 99, so I still consider them OR 99.  I can also buy 99E being part of 99, so I'd agree you can count all the Oregon ones plus the Sacramento concurrency with CA 99, but the rest aren't legit anymore, so this is at best 8 concurrencies by my count.

Historically, there were more-- I excluded the turnoffs in Wolf Creek and Riddle, plus a couple in northern California (Dunsmuir, Shasta, Weed, Yreka?) and Washington (Kelso, Centralia -- and the Tacoma segment started in Tumwater) or the Everett-Blaine segment... But I'll accept your count of 8.

[andytom]

I'm surprised nobody's mentioned I-70 and US-40.  I counted 12 between those but that was just a cursory look through the RMcN, not a detailed look.

--Andy

[SSOWorld]

I'm surprised nobody's mentioned I-70 and US-40.  I counted 12 between those but that was just a cursory look through the RMcN, not a detailed look.

--Andy

One of those "basic topics of trivium" I thought about last night looking at my most recent copy of the Rand McNally atlas...a couple come to mind immediately:

- I-90/I-94 in Madison and in Chicago
- Routes 93 and 95 across national borders!  (one towards Golden, BC, and US 93/95 in Las Vegas/Boulder City)
- US 40 and I-70 in various points across the Midwest

Out of the initial query comes two related questions:

- What's the longest distance between two routes' concurrencies?  (I'm thinking 93/95 above might earn that distinction)
- What's the most instances of two routes running with each other on the same alignment?  In California, I think it has to be Route 1 with US 101 (Exit 62B in Ventura northwest to the "Pacific Coast Highway" exit approximately mile marker 73, Exit 78 northwest to Exit 132 in Gaviota via Santa Barbara, Exit 191A in Pismo Beach to milemarker 204 in San Luis Obispo, San Francisco Presidio north across the Golden Gate Bridge to Sausalito/Marin City) with four.

Any questions?

[TheStranger]

Bickendan: Don't forget US 99 definitely being co-signed with I-5 on the Golden State Freeway from I-10 north to Wheeler Ridge, which existed until the mid-1960s.  (You could even argue for Route 99's Stockton-Sacramento stretch here as it was "Temporary I-5" for some years!)

[mightyace]

In Virginia, I-81 and US 11 are concurrent between Exits 73 and 89 (Wytheville to Pulaski) and Exits 167 and 175 (Buchanan and Natural Bridge)

And, how many times are US 1 and I-95 concurrent in there run.  (Just a quick look at Connecticut found two.)

[WNYroadgeek]

US 20 and NY 5 multiplex from Silver Creek to Brant and then again from Avon to Auburn.