Recurring concurrencies

[TheStranger]

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

I suspect fewer than one would think, as I-95 usually (though not always) has many spots where it serves basically as a toll alternative to US 1, when they run parallel.  (Also, of course, US 1 going inland north of Jacksonville affects how often 95 and 1 run close by.)

1. George Washington Bridge, Fort Lee to The Bronx
2. Old Lyme, CT
3. Gold Star Memorial Bridge, New London, CT
4. Dedham, MA along Route 128 (wrong way concurrency to get US 1 northbound to I-93 northbound/Route 128 southbound)

Wow, that's it!

[froggie]

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)

But, as I noted earlier, not as many as the three concurrencies between I-64 and US 60 within Virginia...two west of Lexington and one on the HRBT.

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

As Mr. Sampang noted, not as many as you'd otherwise expect.  In no small part because the two routes run on completely different corridors between Petersburg, VA and Jacksonville, FL.

[TheStranger]

  In no small part because the two routes run on completely different corridors between Petersburg, VA and Jacksonville, FL.

Further up north, there are two lengthy areas where 95 and 1 diverge significantly as well:

- New London, CT to Providence, RI
- Portland, ME to Bangor, ME

[TheStranger]

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.

Going on the idea of "historical high", we'd probably have to be in the mid-1960s for this to work:

I-5/US 99 would run together between Los Angeles (Interstate 10/San Bernardino Freeway) and Wheeler Ridge, then...the first years of the Route 99/I-5 concurrency in downtown Sacramento (unless you want to count Temp I-5 and Route 99 between Stockton and Sacramento), followed by the aforementioned Oregon and Washington examples.  If we include BC 99 as part of the route, then that would also put the Everett-Blaine routing back on the list.

Not sure what the final total for that would be.

----

US 40 and I-70...

1. Empire, CO to Limon, CO through Denver
2. Oakley, KS to Topeka, KS
3. Bonner Springs, KS to I-70 Exit 6 in Kansas City, MO (passing through downtown)
4. I-70 Exit 24 in Grain Valley, MO (near East Kansas City Airport) to Exit 101 in Boonville, MO
5. I-70 Exit 121 west of Columbia, MO to I-70 Exit 210B in Wentzville, MO (at I-64)
6. St. Louis, MO at I-70 Exit 251A across the Poplar Street Bridge to I-70/I-55 Exit 17 in Troy, IL
7. Highland, IL at I-70 Exit 30 to Pocahontas, IL at I-70 Exit 36
8. I-70 Exit 154 east of Weaver, IL to I-70 Exit 1 near West Terre Haute, IN
9. I-70 Exit 186 in Old Washington, OH (at Route 285) to Exit 204 in Morristown, OH
10. I-70 Exit 0 on Wheeling Island to Exit 1
11. I-70 Exit 1A in Hancock, MD (at I-68) to Exit 11 near Pecktonville, MD
12. I-70 Exit 56 in Frederick, MD to Exit 82 in Turf Valley, MD

So 12 (Andy's count was spot-on) probably takes the cake nationally, though US 30/I-84 in Oregon seems to be the most within one state, with 8.

[Bickendan]

I wasn't even counting the LA-Wheeler Ridge or the Stockton concurrencies simply because there isn't a Baja CA 99...

[TheStranger]

I wasn't even counting the LA-Wheeler Ridge or the Stockton concurrencies simply because there isn't a Baja CA 99...

IIRC, MX 57/US 57 (which was originally Texas 57) is the ONLY international number continuance from the US to Mexico, while US to Canada has many examples of this (395, 95, 93, 99, 97, 59, 75).

WRT 99 - during the time of I-5's construction, would that have been the clear winner in California?  At least two of the US 101/Route 1 concurrencies (the Ventura-area routings) only came about once the southern segment of Route 1 was renumbered from previous designation as US 101A.  (Previously, that had been the original Route 3.)

[Bickendan]

Here's a historical on I think will take the cake: US66 and I-40. If Bus I-40 is taken to be a historical routing for US 66, we have a good number of them. Let's see.
Diverging alignments: California - 2; 1 Bus I-40. (Between Barstow and Needles; Needles itself)
Arizona - 10, 8 Bus I-40
New Mexico - 6 Bus I-40
Texas - 7 Bus I-40
Oklahoma - 6 Bus I-40 before Oklahoma City.
Rough alignment split estimate: 31

[andytom]

US 40 and I-70...

1. Empire, CO to Limon, CO through Denver
2. Oakley, KS to Topeka, KS
3. Bonner Springs, KS to I-70 Exit 6 in Kansas City, MO (passing through downtown)
4. I-70 Exit 24 in Grain Valley, MO (near East Kansas City Airport) to Exit 101 in Boonville, MO
5. I-70 Exit 121 west of Columbia, MO to I-70 Exit 210B in Wentzville, MO (at I-64)
6. St. Louis, MO at I-70 Exit 251A across the Poplar Street Bridge to I-70/I-55 Exit 17 in Troy, IL
7. Highland, IL at I-70 Exit 30 to Pocahontas, IL at I-70 Exit 36
8. I-70 Exit 154 east of Weaver, IL to I-70 Exit 1 near West Terre Haute, IN
9. I-70 Exit 186 in Old Washington, OH (at Route 285) to Exit 204 in Morristown, OH
10. I-70 Exit 0 on Wheeling Island to Exit 1
11. I-70 Exit 1A in Hancock, MD (at I-68) to Exit 11 near Pecktonville, MD
12. I-70 Exit 56 in Frederick, MD to Exit 82 in Turf Valley, MD

So 12 (Andy's count was spot-on) probably takes the cake nationally, though US 30/I-84 in Oregon seems to be the most within one state, with 8.

There would be an additional one in CO as they separate through Denver, I believe.

--Andy

[TheStranger]

There would be an additional one in CO as they separate through Denver, I believe.

--Andy

Oh yeah, Colfax Avenue with Business I-70 and US 287.  So that makes it 13!

Bickendan: With regards to 66/40, I think it also depends on how fast each state decomissioned 66 - in California, 66 survived early into the Interstate era (judging from 1960s co-signage with 91/395 and I-15 in Cajon that I've seen photos of, as well as the greened out 40/66 sign in Barstow on I-15) but not much longer than that, while it still existed in Oklahoma and certain points west as late as 1982.

[njroadhorse]

The Garden State Parkway and US 9 are concurrent 3 times together in South Jersey, if you count the Beesley's Point Bridge detour as one.

[bugo]

There would be an additional one in CO as they separate through Denver, I believe.

--Andy

Oh yeah, Colfax Avenue with Business I-70 and US 287.  So that makes it 13!

Bickendan: With regards to 66/40, I think it also depends on how fast each state decomissioned 66 - in California, 66 survived early into the Interstate era (judging from 1960s co-signage with 91/395 and I-15 in Cajon that I've seen photos of, as well as the greened out 40/66 sign in Barstow on I-15) but not much longer than that, while it still existed in Oklahoma and certain points west as late as 1982.

US 66 was decommed in 1985.

[agentsteel53]

California truncated 66 to Pasadena (from Santa Monica) in 1964, and then to the Arizona state line at Topock in 1974.

[TheStranger]

California truncated 66 to Pasadena (from Santa Monica) in 1964, and then to the Arizona state line at Topock in 1974.

Since Arizona's last decomissioning of 66 came in 1985...I would assume the peak of co-routing with 40 would be somewhere in the early 1970s.  Didn't Illinois truncate its portion about the same time California did, though?

[agentsteel53]

Illinois started truncating in 1976.  By 1980, Missouri had joined in on the fun and the route was truncated to Joplin.

http://www.usends.com/60-69/066/066.html

[UptownRoadGeek]

I-10/U.S. 90 from TX to FL
I-20/U.S. 80 from TX to AL
I-55/U.S. 51 from LA to MS
I-55/U.S. 61 from AR to MO
I-59/U.S. 11 from LA to AL

[TheStranger]

I-10/U.S. 90 from TX to FL

1. San Antonio east to Seguin
2. Columbus to Brookshire
3. Katy to I-610 in east Houston
4. Beaumont to Vinton, LA
5. I-10 Exit 26 to 31B in Lake Charles

East of Lake Charles, they generally run on seperate alignments, even when parallel.

I-20/U.S. 80 from TX to AL

1. Marshall to Waskom
2. Delta, LA to Clinton, MS
3. I-20 Exit 129 to I-20/59 Exit 154B in Meridian, MS

I-55/U.S. 51 from LA to MS

1. I-10 north to Ponchatoula, LA
2. Crystal Springs, MS to Jackson

I-55/U.S. 61 from AR to MO

1. Exit 12B in Memphis north to Turrell, AR
2. Steele, MO to Portageville, MO
3. Scott City, MO to Cape Girardeau

I-59/U.S. 11 from LA to AL

1. Pearl River, LA to Picayune, MS
2. I-20/59 Exit 150 to Exit 154B in Meridian, MS
3. I-20/59 Exit 97 in Caffee Junction, AL to Exit 108 in Bessemer, AL

[Truvelo]

Has anyone mentioned I-91 and US-5 yet?

[TheStranger]

Has anyone mentioned I-91 and US-5 yet?

Apparently, according to Wikipedia, the routes are only co-signed for a half-mile in Springfield, MA.  (They run immediately parallel - but not on the same alignment - in Hartford where the Wilbur Cross Highway turns to the northeast.)

[TheStranger]

Earlier in this thread, I-80/US 30 was mentioned...here's their concurrencies:

1. Little America, WY at I-80 Exit 66 to I-80 Exit 235
2. Laramie, WY at I-80 Exit 316 to I-80 Exit 358 in Cheyenne
3. Cheyenne at I-80 Exit 370 to I-80 Exit 401 in Pine Bluffs, WY

However, in Nebraska the routes run closely parallel - but never together - until Grand Island, NE, at which point US 30 and I-80 take divergent paths to Joliet, IL.  They cross in Joliet, and then never intersect again.

[ctsignguy]

Has anyone mentioned I-91 and US-5 yet?

Apparently, according to Wikipedia, the routes are only co-signed for a half-mile in Springfield, MA.  (They run immediately parallel - but not on the same alignment - in Hartford where the Wilbur Cross Highway turns to the northeast.)

and the only reason US5 is concurrent on 91 is that one road ends at 91 and the other road US 5 rides on picks up a half-mile later...

Would I-91 and US 5 be unusual for closely paralleling routes with only one concurrency between them?

[TheStranger]

Has anyone mentioned I-91 and US-5 yet?

Apparently, according to Wikipedia, the routes are only co-signed for a half-mile in Springfield, MA.  (They run immediately parallel - but not on the same alignment - in Hartford where the Wilbur Cross Highway turns to the northeast.)

and the only reason US5 is concurrent on 91 is that one road ends at 91 and the other road US 5 rides on picks up a half-mile later...

Would I-91 and US 5 be unusual for closely paralleling routes with only one concurrency between them?

The road I can think of that might have even fewer would be US 11 with any of its parallel interstates (59, 24, 75, 40, 81).  I'll check via Google Maps and edit this post afterward...

I-59:
1. from I-59 Exit 3 in Pearl River, LA to I-59 Exit 1 in Nicholson, MS
2. from I-59/I-20 Exit 150 in Meridian, MS to I-59/I-20 Exit 154
3. from I-59/I-20 Exit 97 in Lake View, AL to I-59/I-20 Exit 108 in Bessemer

I-75:
1. I-75 Exit 7A in Chattanooga to I-75 Exit 11 in Ooltewah, TN

I-81:
1. I-81/I-77 Exit 73 in Wytheville, VA to I-81 Exit 89A
2. I-81 Exit 167 northeast of Roanoke to I-81 Exit 175

However, 11 does diverge from 81 significantly between Harrisburg and Wilkes-Barre, and of course past Watertown, NY.

[Bickendan]

Here's a variation: US 93/95.

They duplex from between Boulder City and Henderson to Las Vegas (with I-515 joining in on the fun), and again in British Columbia for a long duplex north of Cranbrook to Radium Hot Spring as BC 93/95 -- after both have a decent duplex with BC 3!

So what's the longest distance between a concurrency?

[TheStranger]

Here's a variation: US 93/95.

They duplex from between Boulder City and Henderson to Las Vegas (with I-515 joining in on the fun), and again in British Columbia for a long duplex north of Cranbrook to Radium Hot Spring as BC 93/95 -- after both have a decent duplex with BC 3!

So what's the longest distance between a concurrency?

The 93/95 double-pair is separated by 1,183 miles of US/BC 93 and 1,288 miles of US/BC 95, probably a record worldwide!

Within one country, the US 26/30 gap between concurrencies (from Bliss, ID to Ogallala, NE) is 815 miles or so on US 30, and 857 miles via US 26.

[golden eagle]

U.S. 80 duplexes with I-20 twice in Mississippi: from Clinton to Vicksburg and in the Meridian area.

[TheStranger]

No longer a recurring concurrency, but US 60 and 70 used to have three between Los Angeles and New Mexico:

1. from US 101 at the San Bernardino Split in Los Angeles to today's Holt Avenue exit off of I-10 in Pomona

2. from today's Route 60/I-10 junction in Beaumont to Globe, AZ via Phoenix

3. the only remaining one (537 miles away from Globe via US 60, 572 miles from Globe via US 70), from Clovis, NM to Texico, NM