Interstate/State Route Concurrencies

[roadman]

How long (legally) is that I-95/Rt. 128 concurrency in the Boston area? That might be a contender.

According to MassDOT's Road Inventory file, the I-95/MA 128 concurrency between Canton and Peabody is just about 37 miles.  This is verified by the fact that the first milepost on 128 north of the I-95 split reads 37.4.

[bing101]

CA-22 and I-405 is partially Cosigned between OC and Los Angeles County

I-80 and CA-12 is Cosigned in Fairfield, CA
CA-113 and I-80 is cosigned between Dixon and Davis, CA

I-280 and CA-35 is Co-signed near CA-92 in San Mateo County

Business 80 and CA-51 concurrent in Sacramento CA

CA-99 and I-5 concurrent between Natomas and Downtown Sacramento.

[NE2]

I-110 and CA-110 Between the US-101 interchange and I-10 in Downtown Los Angeles has been a contentious one.

what

[froggie]

Mississippi: I-59/MS 42

Also I-59/MS 43 in Picayune and I-20/I-59/US 11/US 80/MS 19 in Meridian.

*Vermont: none? (I-91/VT 9 doesn't exist)

There is technically an I-91/TRUCK VT 9, but it's not signed as such.

[PHLBOS]

How long (legally) is that I-95/Rt. 128 concurrency in the Boston area? That might be a contender.

According to MassDOT's Road Inventory file, the I-95/MA 128 concurrency between Canton and Peabody is just about 37 miles.  This is verified by the fact that the first milepost on 128 north of the I-95 split reads 37.4.

You're a tad late to the party: 

How long (legally) is that I-95/Rt. 128 concurrency in the Boston area? That might be a contender.

Just over 37 miles from Canton (Exit 12) to Peabody (Exit 45).

The first actual 128 Mile marker beyond the I-95 split reads 37.2.

[hbelkins]

Mississippi: I-59/MS 42

Also I-59/MS 43 in Picayune and I-20/I-59/US 11/US 80/MS 19 in Meridian.

*Vermont: none? (I-91/VT 9 doesn't exist)

There is technically an I-91/TRUCK VT 9, but it's not signed as such.

Signed as "To Vt. 9" or at least it was six years ago.

[NE2]

But then you get beyond those overheads and there's VT 9 east reassurance.

[SectorZ]

Signed as "To Vt. 9" or at least it was six years ago.

I hope that sign is rare in that you are in Vermont, and they direct you to one of their own towns along with adding Vermont to it. Been thru those signs before and never caught it until now.

[PHLBOS]

Note the old-style (even for when that BGS was new) font in the I-91 shields.  I'm sure such is getting more rare as time rolls on.

[hbelkins]

I wouldn't be surprised if those haven't been replaced. On this trip, I just used I-91 between this exit and the next one to avoid downtown Brattleboro. The signs that were on that short portion of I-91 then had been replaced when I was on it two years ago.

[TEG24601]

I'm actually surprised that I can't find any State/Interstate Concurrencies in Washington, several US routes, but no State Routes.


Oregon however it lousy with them, mainly OR 99, 99W, and 99E, largely because 99 joins and leaves I-5 all through the state.

[NE2]

I'm actually surprised that I can't find any State/Interstate Concurrencies in Washington, several US routes, but no State Routes.

As I listed above, I-405/SR 900.

[Bickendan]

I'm actually surprised that I can't find any State/Interstate Concurrencies in Washington, several US routes, but no State Routes.


Oregon however it lousy with them, mainly OR 99, 99W, and 99E, largely because 99 joins and leaves I-5 all through the state.

99W never overlaps with I-5. Its only overlap is with with US 20 and OR 34 in Corvallis.
99E has only one overlap with I-5. Bus 99E doesn't -- it straddles I-5 at the north end of the Salem Pkwy to connect to mainline 99E (and I don't think it officially connects to 99E at all).

And as often as 99 duplexes with I-5, US 30 still has it beat on I-84, especially with the Hist US 30 routing taking US 30 off I-84 in the Gorge.

[theline]

It was mentioned above that SR-37 in Indiana duplexes with I-69, which is certainly correct. It also duplexes with I-465 around Indianapolis, as does SR-67. These duplexes are kind of in a gray area as far as being "signed." There are no reassurance signs for the state routes along 465, but signs direct motorists onto the interstate to continue driving on the state route in each case.

[tdindy88]

While we are on Indiana, using the Great Indianapolis Highway Multiplex that is I-465, I-74 is also concurrent with SRs 37 and 67. Back to I-69, I don't think it's been mentioned yet of the concurrencies with SR 57 from MMs 18 to 22, SR 38 from MMs 219 to 222, SR 9 from MMs 222 to 226 and SR 67 from MMs 222 to 234.

The only other concurrency I can think of at this moment would be SR 62 with both I-64 and I-265 around New Albany.

[WNYroadgeek]

I-81/PA 309 in the Wilkes Barre area, I-78/PA 309 in the Allentown area, and I-99/PA 26 in the Bellefonte area are a few that come to mind.

The I-99/US 220/PA 26 one is interesting...an Interstate/US Route/State Route concurrency.  I-90/US 14/SD 79 listed below also meets that test, as does I-86/US 219/NY 17 (with the 86/17 mentioned previously)

Adding more PA to this:
-I-80/PA 66 near Clarion

More New York:
-I-81/NY 17 in Binghamton
-I-84/NY 52 near Newburgh
-I-88/NY 7 near Binghamton
-I-87/NY 7 near Albany (North 87 only)
-I-790/NY 5-8-12 in Utica
-I-88/NY 28 in Oneonta
-I-190/NY 324 over the South Grand Island Bridge
-I-278/NY 440 in Staten Island
-NOT NY 15 - Officially begins in Wayland despite signage that NY seems to keep putting up  (Why doesn't NY just make NY 415 into NY 15?)
-Does NY 878/I-878 count? 

Also I-890 and NY 7. And a wrong-way concurrency to boot!

[roadfro]

NE2 pointed out Nevada doesn't have any. For a few years, one was signed, but I don't know how "official" it was.

When first constructed, I-215 in Las Vegas/Henderson was co-signed with SR 146, from Exit 6 (St. Rose Pkwy/SR 146) and its terminus at I-515/US 93/US 95. This is because I-215 was built directly on the SR 146 alignment, and SR 146 continued east beyond the interstate. The county built and signed the freeway overlap, but NDOT logs did not recognize the overlap at that point. NDOT eventually renumbered the eastern leg of 146 as SR 564, and the overlapping signs were eventually removed.

[m2tbone]

I found another one for Missouri.  MO Hwy 7 is concurrent with I-49 in the Harrisonville area for a short distance.

[DandyDan]

In Nebraska, when they built the Nebraska Highway 71 bypass of Kimball, it overlapped I-80 to connect to the part of NE 71 south of Kimball.

Some people have the false belief that Nebraska Highway 2 overlaps I-80 from the easternmost Grand Island exit to US 77 in Lincoln, but the highway log and signage on I-80 say otherwise. 

[mapman1071]

Which states don't have any? Not counting states already mentioned here:
*Alabama: I-359/SR 69
*Alaska: fuck you
*Arizona: I-17/SR 89A
*Arkansas: I-49/AR 12, I-49/AR 16
*Colorado: I-70/SH 9
*Delaware: none
*District of Columbia: fuck you
*Georgia: I-75/SR 7 from Valdosta to Hahira
*Hawaii: none
*Idaho: I-84/SH 55
*Illinois: I-55/I-64/IL 3
*Indiana: I-69/SR 37
*Kentucky: I-265/KY 841
*Louisiana: I-49/LA 8
*Maine: I-95/SR 15
*Maryland: nothing signed, but I-595/MD 2
*Massachusetts: I-91/Route 2
*Michigan: I-96/M-37
*Mississippi: I-59/MS 42
*Nebraska: none?
*Nevada: none
*New Hampshire: I-89/NH 10
*New Mexico: none
*North Carolina: I-277/NC 16
*North Dakota: I-94/ND 3
*Oklahoma: I-44/SH 66
*Oregon: I-5/OR 138
*Rhode Island: none
*South Carolina: I-385/SC 14 (well-signed, at least on SC 14 west) and I-585/SC 9 (though signage for I-585 is somewhat lacking)
*Tennessee: I-40/SR 56
*Texas: I-10/SH 17
*Utah: none, unless there's a sign somewhere for SR 30 on I-15 or I-84
*Vermont: none? (I-91/VT 9 doesn't exist)
*Washington: I-405/SR 900
*Wisconsin: I-94/WIS 35
*Wyoming: I-80/WYO 789

That's 40/50 states with something signed.

Montana has I-90/MT 200 as well as I-15/MT 200
South Dakota has I-90/SD 34/SD 79, among others.
Kansas has I-70/K-4, among others.
Cali has I-5/SR-113 among others.
Iowa has I-35/IA 27, among others?

Does Missouri have any? I can't think of any.

Arizona I-40/AZ 99
Arizona/California I-40/AZ 95 (Unsigned)

[PurdueBill]

Twice:

Ohio State Route 2 is concurrent with I-90 for about 17 miles in the western suburbs of Cleveland.  Then just east of downtown, Route 2 connects back up with I-90 for another 10 miles through the east side.

OH 21 runs with I-77 for about 10 miles from Montrose to Richfield, and OH 14 runs with I-480 for over 20 miles at its eastern end.  There are other ones also like the short duplex of OH 4 with I-70 and OH 49 with I-70.

Indiana for a while had the signed duplex of SR 25 and I-65 around Lafayette, which was unusual for Indiana.  That party ended when INDOT went on a kick of discontinuous segments.

[bing101]

How about Florida about I-4 and FL 400

http://en.m.wikipedia.org/wiki/Florida_State_Road_400#State_Road_400

This is an interesting one where a state route and an interstate share the Same route the entire way.

[Bickendan]

How about Florida about I-4 and FL 400

http://en.m.wikipedia.org/wiki/Florida_State_Road_400#State_Road_400

This is an interesting one where a state route and an interstate share the Same route the entire way.

Am I interpreting the article correctly that FL 400 is concurrent with the length of I-4 in addition to the signed portion on the east side of I-95 beyond I-4?

[NE2]

Yes. Florida is one of four states to give state numbers to federal routes (though only Florida and Georgia do it on Interstates). Insert disparaging remark about bling101.

[Bickendan]

Georgia I was aware of; I'd say Oregon and...?