In Mississippi, I-10, I-110 and US 90 along the Gulf Coast are not duplexed with any other highways. In the northern part, US 72 and 78 are by their lonesome, though 78 will become I-22 in the very near future.
I-91 in Vermont.
Plus many short ones (most 3dis that are 10 miles or shorter would qualify).
In Michigan:
I-475 and I-675
US-45 and US-8
In Florida I-4 does not at all duplex with any routes.
Also I-75, I-175, I-375, I-295, I-595, and I-110.
QuoteI-91 in Vermont.
Technically has TRUCK US 2 and TRUCK VT 9.
Quote from: roadman65 on February 01, 2015, 02:01:22 PM
In Florida I-4 does not at all duplex with any routes.
Unless you count US 17-92 Truck. But truck routes usually live on a different plane.
Kentucky has four interstates without concurrencies.
I-24, I-264 (since US 60 was taken off the Watterson Expressway many years ago), I-275 and I-471.
I-64 enters the state with US 150. I-65 has a brief concurrency with KY 61 in Louisville in at least one direction. I-71 and I-75 have a concurrency. I-265 is also co-signed with KY 841.
Every US route has a concurrency, with the possible exception of US 79. It may have a short concurrency with a state route, but to confirm would require an inspection of Kentucky county route maps.
Quote from: hbelkins on February 01, 2015, 03:55:37 PM
Every US route has a concurrency, with the possible exception of US 79. It may have a short concurrency with a state route, but to confirm would require an inspection of Kentucky county route maps.
KY 1151: http://en.wikipedia.org/wiki/U.S._Route_79_in_Kentucky#Major_intersections
Is US 160 cheating?
I-90, I-184, and US 195 are the only ones in Idaho.
Montana has none. Wyoming has US 212 and that's it.
I-85, 165 and 10 in Alabama made the cut. I-65 almost made it, but it has a short concurrency with US 82 in the Montgomery area.
PA (off the top of my head)
I-95 (forgot about the short segment that duplexes w/US 322)
I-176
I-276
I-283
I-476
I-579
MA
I-84 (though it was once co-signed w/MA 15 many years back)
I-90
I-190
I-290
I-295
I-391
I-395
New Jersey:
I-195
I-287
I-76
US 322?
Quote from: Zeffy on February 01, 2015, 05:19:33 PMUS 322?
Nope, the eastern leg of it's duplexed (unnecessarily IMHO) with US 40.
I-195 in Saco/OOB is the only interstate in Maine without any duplexes if you don't count the Falmouth Spur (hidden I-495). All other US and interstates in the state have at least one duplex somewhere along their routes.
Louisiana has:
I-12
I-110
I-210
I-220
I-610
All US routes are duplexed at some point. US 65 comes the closest. Only one short duplex with LA 128, and that looks like it could have been a realignment from meeting US 65 in the middle of a curve
Quote from: golden eagle on February 01, 2015, 04:48:11 PM
I-85, 165 and 10 in Alabama made the cut. I-65 almost made it, but it has a short concurrency with US 82 in the Montgomery area.
Also US 31 in two places. One north of Birmingham and the other at the AL/TN State Line.
QuoteI-85, 165 and 10 in Alabama made the cut.
I-85 and US 80 are concurrent between Exit 11 and Exit 16. Google Maps is in error here.
US 29 and US 280 also have concurrencies with I-85 in the Auburn/Opelika area.
Unless I'm missing something, I-459 is another Alabama route that lacks concurrencies.
I-165 overlaps US 90 and US 98 Truck.
Quote from: roadman65 on February 01, 2015, 02:01:22 PM
In Florida I-4 does not at all duplex with any routes.
Also I-75, I-175, I-375, I-295, I-595, and I-110.
All Florida interstates are duplexed with the unsigned SR numbers. US 17 and SR228 triplex with I-10 and I-95 in downtown Jax. And as far as I have read here US 1 and 90 triplex with I-95 in downtown Jacksonville
Although the only place you ever see secret SR number on interstates is the construction info signs
Quote from: froggie on February 01, 2015, 07:08:21 PM
I-85 and US 80 are concurrent between Exit 11 and Exit 16. Google Maps is in error here.
If I remember correctly, I-85 and US 80 are concurrent between Exit 6 and Exit 16.
Quote from: roadman65 on February 01, 2015, 06:48:56 PM
Quote from: golden eagle on February 01, 2015, 04:48:11 PM
I-85, 165 and 10 in Alabama made the cut. I-65 almost made it, but it has a short concurrency with US 82 in the Montgomery area.
Also US 31 in two places. One north of Birmingham and the other at the AL/TN State Line.
And AL 69 between Exits 299 and 304.
And US 80 between Exit 167 and 168.
Texas loves to decommission and I may have missed something, but I don't find any US routes in Texas that don't duplex at some point. Regarding Interstates, I think I-610, I-635 and (arguably) I-345 may qualify.
Quote from: PHLBOS on February 01, 2015, 05:11:44 PM
PA (off the top of my head)
I-95
I-176
I-276
I-283
I-476
I-95 has a short duplex with U.S. 322 between Exits 3 and 4.
Quote from: GaryV on February 01, 2015, 01:33:02 PM
In Michigan:
I-475 and I-675
US-45 and US-8
Unless I missed something, I-375 and I-696 also lack concurrencies. Also, I don't think US 24 has a concurrency in Michigan at the present time.
Quote from: bulldog1979 on February 01, 2015, 08:47:05 PM
Quote from: GaryV on February 01, 2015, 01:33:02 PM
In Michigan:
I-475 and I-675
US-45 and US-8
Unless I missed something, I-375 and I-696 also lack concurrencies. Also, I don't think US 24 has a concurrency in Michigan at the present time.
Correct, I missed those.
I-393.
Why? Triplexes aren't duplexes.
I could not find any other "entirely triplexed or more" US routes or Interstates within any state, but there might be more.
Quote from: golden eagle on February 01, 2015, 04:48:11 PM
I-85, 165 and 10 in Alabama made the cut. I-65 almost made it, but it has a short concurrency with US 82 in the Montgomery area.
I-759 in Gadsden also makes the cut.
QuoteWhy? Triplexes aren't duplexes.
Semantics. Also why "concurrency" is a better term to use.
"Overlap" is less awkward.
I-235 in Iowa. (and if you want to argue semantics, I-129 is concurrent with US-20 and US-75 its entire length in the state)
Of all the US highways in Iowa, all of them have an overlap of some sort. Even the quarter mile of US-77 is concurrent with US 20 Biz.
Not including any 3dIs.
In Colorado, you only have the relatively trivial examples of U.S. 84, 138 and 350 as having no concurrencies. U.S. 350 ends at U.S. 160 near Trinidad.
In Arizona, neither I-8 nor I-19 have concurrencies. I think as it's been truncated, neither does U.S. 89.
In California, I-8, U.S. 6, U.S. 199, U.S. 101 (pretty sure about this).
Also U.S. 395.
IIRC, there are no US highways of any significant length (longer than 10 miles) that go without a concurrency in Virginia. As for interstates, the only ones without an overlap are I-295, I-664, I-464, I-564, I-195, and I-381.
Quote from: The High Plains Traveler on February 01, 2015, 10:41:43 PM
In California, I-8, U.S. 6, U.S. 199, U.S. 101 (pretty sure about this).
Doesn't US 101 have a concurrency with CA 1 somewhere? I seem to recall having seen one signed somewhere west of L.A. GMaps shows one in Ventura, maybe it was there.
All Interstates in Georgia have hidden state routes running with them, but if you want to restrict it to signed routes only, that narrows it a little: I-24, I-59, I-95, I-185, I-475, I-520, and I-675 aren't
signed alongside any other routes. US routes get blanked here, though, because they're also all paired with state routes, and those are all signed.
Quote from: Eth on February 01, 2015, 10:56:25 PM
Quote from: The High Plains Traveler on February 01, 2015, 10:41:43 PM
In California, I-8, U.S. 6, U.S. 199, U.S. 101 (pretty sure about this).
Doesn't US 101 have a concurrency with CA 1 somewhere? I seem to recall having seen one signed somewhere west of L.A. GMaps shows one in Ventura, maybe it was there.
Yes, but not with any U.S. or Interstate route. I thought this thread was only looking for those.
Delaware:
-I-495
aaaand that's it to my knowledge
Quote from: akotchi on February 01, 2015, 08:19:31 PM
Quote from: PHLBOS on February 01, 2015, 05:11:44 PM
PA (off the top of my head)
I-95
I-95 has a short duplex with U.S. 322 between Exits 3 and 4.
Forgot about that. I've since edited my earlier post to reflect such.
Quote from: Zeffy on February 01, 2015, 05:19:33 PM
New Jersey:
...
I-287
Nope, there's a very short duplex with NJ 17 at the NY State line.
SD: I-229... aaaand that's it.
Quote from: bzakharin on February 02, 2015, 09:41:34 AM
Quote from: Zeffy on February 01, 2015, 05:19:33 PM
New Jersey:
...
I-287
How about I-278?
For NJ, yes.
Maybe the above-287 is a typo for I-278 since (as mentioned earlier) I-287 has a short duplex w/NJ 17 at its northern end.
Quote from: Zeffy on February 01, 2015, 05:19:33 PM
New Jersey:
I-195
I-287
I-76
US 322?
Until the construction's done, I-76's eastern terminus is on a multiplex with I-295.
North of where US 322 splits off of the Black Horse Pike (which continues NB as NJ-42), it's concurrent with CR 536.
QuoteIn California, I-8, U.S. 6, U.S. 199, U.S. 101 (pretty sure about this).
California seems to have quite a few that run solo in the state.
A few more that come to mind...
I-15
I-215
I-405
I-605
I-105
I-110
I-710
I-805
US 6
In Pennsylvania's case, now that I-279 has been truncated, where does it have another route along for the ride? The section that was concurrent with US 22 and US 30 is now part of I-376.
Quote from: hbelkins on February 02, 2015, 10:40:18 AM
In Pennsylvania's case, now that I-279 has been truncated, where does it have another route along for the ride?
US 19 Truck.
I can only think of I-405, I-705, and I-205 in Washington.
Quote from: TEG24601 on February 02, 2015, 11:52:49 AM
I can only think of I-405, I-705, and I-205 in Washington.
I
I 405 has a short concurrency with SR 900.
Quote from: The High Plains Traveler on February 01, 2015, 10:58:12 PM
Quote from: Eth on February 01, 2015, 10:56:25 PM
Quote from: The High Plains Traveler on February 01, 2015, 10:41:43 PM
In California, I-8, U.S. 6, U.S. 199, U.S. 101 (pretty sure about this).
Doesn't US 101 have a concurrency with CA 1 somewhere? I seem to recall having seen one signed somewhere west of L.A. GMaps shows one in Ventura, maybe it was there.
Yes, but not with any U.S. or Interstate route. I thought this thread was only looking for those.
Looking at the posts on the first thread, it seems state route concurrencies also are being considered. 15, 215, 405 all have concurrencies with at least one state route, and 101 has quite a few.
Thus...the Interstate and US routes that completely lack overlapped routes in California:
I-105
I-205
I-505
I-605
I-805
future 905
I-8
I-110
I-710
I-380
I-780
I-980
I-238
US 6
US 199
EDIT: removed 210 as admtrap noted there is the concurrency with Route 2.
Quote from: TheStranger on February 02, 2015, 12:10:25 PM
I-8
From what I can tell,
all of I-8 qualifies (both California and Arizona). Are there any other Interstates or US routes in more than one state where their
entire length is not duplexed?
Oregon:
US 101 might be it, now that US 26 terminates at 101 instead of US 30 in Astoria. Let's see...
I-5 - OR 99, OR 99E, US 30
I-82 - US 395
I-84 - US 30, US 395
I-105 - OR 126
I-205 - OR 213, 224
I-405 - US 26, US 30
US 20 - OR 34, 99W, OR 99E, OR 126, US 97 Bus, US 395, US 26, OR 201
US 20 Bus (Toledo) - none
US 26 - I-405, US 97, US 20, OR 201
US 30 - I-405, I-5, I-84, OR 35*, US 197, US 395, OR 11, OR 7
US 30 Byp (Portland) - none
US 30 Bus (Huntington) - none
US 95 - none
US 95 Spur (Weiser ID) - none
US 97 - US 26
US 97 Bus (Klamath Falls) - OR 39 Bus, OR 39
US 97 Bus (Bend) - US 20
US 101 - none
US 101 Bus (Astoria) - OR 202
US 197 - US 30
US 199 - none
US 395 - OR 140, US 20, US 26, I-84, US 30, US 730, I-82
US 730 - US 395
None of the Interstates then, and US 95, 101 and 199 are the only mainline US highways that have no overlaps.
Bus 20 (Toledo), Bypass 30 (Portland), Bus 30 (Huntington), and Spur 95 (Weiser ID) also need some overlap love.
*Not that it affects US 30's qualification at all, but OR 35 is included if it terminates at I-84 or at the state line on the Hood River Bridge instead of at US 30.
Quote from: 1 on February 02, 2015, 12:19:45 PM
Quote from: TheStranger on February 02, 2015, 12:10:25 PM
I-8
From what I can tell, all of I-8 qualifies (both California and Arizona). Are there any other Interstates or US routes in more than one state where their entire length is not duplexed?
US 163, US 195
Ohio has I-270, I-280, I-470, I-471, I-490, I-675.
West Virginia has US 30, US 22, I-470, I-79.
Indiana has I-275. Kentucky has I-275 and I-471.
Quote from: odditude on February 02, 2015, 09:55:56 AM
Quote from: Zeffy on February 01, 2015, 05:19:33 PM
New Jersey:
I-195
I-287
I-76
US 322?
Until the construction's done, I-76's eastern terminus is on a multiplex with I-295.
North of where US 322 splits off of the Black Horse Pike (which continues NB as NJ-42), it's concurrent with CR 536.
...and even more importantly, the eastern ~12 miles of 322 are a concurrency with US 40.
Quote from: corco on February 02, 2015, 12:29:25 PM
Quote from: 1 on February 02, 2015, 12:19:45 PM
Quote from: TheStranger on February 02, 2015, 12:10:25 PM
I-8
From what I can tell, all of I-8 qualifies (both California and Arizona). Are there any other Interstates or US routes in more than one state where their entire length is not duplexed?
US 163, US 195
Does US 199 still run concurrent with OR 99 in Grants Pass? I know there's the newer 199 alignment heading directly east from 99 to 5, and Wikipedia suggests that both that route and the older downtown route with 99 are signed as 199.
Quote from: vtk on February 02, 2015, 01:01:05 PM
West Virginia has US 30, US 22, I-470, I-79.
I-79 overlaps US 19. US 22 overlaps WV 2.
Quote from: NE2 on February 02, 2015, 01:48:47 PM
US 22 overlaps WV 2.
Damn, missed it by
that much.
The body of this post also applies to itself, as I have edited this post to correct the Get Smart catchphrase.
Quote from: TheStranger on February 02, 2015, 12:10:25 PM
Looking at the posts on the first thread, it seems state route concurrencies also are being considered. 15, 215, 405 all have concurrencies with at least one state route, and 101 has quite a few.
Thus...the Interstate and US routes that completely lack overlapped routes in California:
I-105
I-205
I-505
I-605
I-805
future 905
I-8
I-110
I-210
I-710
I-380
I-780
I-980
I-238
US 6
US 199
I was going to ask about I-680 but forgot that there's an ever-so-brief concurrency with CA-84 in Sunol. Oddly enough, that concurrency only applies to northbound I-680. Westbound CA-84 never merges onto southbound I-680.
Quote from: myosh_tino on February 02, 2015, 02:36:22 PM
Quote from: TheStranger on February 02, 2015, 12:10:25 PM
Looking at the posts on the first thread, it seems state route concurrencies also are being considered. 15, 215, 405 all have concurrencies with at least one state route, and 101 has quite a few.
Thus...the Interstate and US routes that completely lack overlapped routes in California:
I-105
I-205
I-505
I-605
I-805
future 905
I-8
I-110
I-210
I-710
I-380
I-780
I-980
I-238
US 6
US 199
I was going to ask about I-680 but forgot that there's an ever-so-brief concurrency with CA-84 in Sunol. Oddly enough, that concurrency only applies to northbound I-680. Westbound CA-84 never merges onto southbound I-680.
For I-210, pretty sure there's an overlap with CA 2 between the Glendale Fwy interchange and the Angeles Crest Hwy exit.
Quote from: admtrap on February 02, 2015, 03:04:32 PM
For I-210, pretty sure there's an overlap with CA 2 between the Glendale Fwy interchange and the Angeles Crest Hwy exit.
Thanks for catching that one - I updated my list.
Well shit, I made a whole list for Interstates in New York and it seems to have gone missing. Oh well, the general takeways were:
—Almost all of the qualifying Interstates are 3dis, the only exception being I-78. And of course, most of the 3dis are too short to be impressive results, except for I-684, I-495, and maybe I-390 (because the NY 15 overlap is no longer official, but there are still signs, so it may not count).
—I-878 may or may not count: it's signed only as NY 878 and not I-878, and it doesn't overlap any other routes. Likewise, I-787 overlaps NY 7, but only where the Interstate is unsigned, so you might not count that.
—Speaking of NY 7, it seems to be the big ruiner here, as it disqualifies not only I-787, but also I-88 and I-890.
—I-90 gets tantalizingly close, with only a teeny overlap with I-87 to disqualify it.
So the winners are:
78
478
678
878 (?)
481
781
684
787 (?)
290
390 (?)
490
590
690
990
295
495
695
895
Did I miss any?
Quote from: empirestate on February 02, 2015, 05:24:18 PM
Well shit, I made a whole list for Interstates in New York and it seems to have gone missing. Oh well, the general takeways were:
—Almost all of the qualifying Interstates are 3dis, the only exception being I-78. And of course, most of the 3dis are too short to be impressive results, except for I-684, I-495, and maybe I-390 (because the NY 15 overlap is no longer official, but there are still signs, so it may not count).
—I-878 may or may not count: it's signed only as NY 878 and not I-878, and it doesn't overlap any other routes. Likewise, I-787 overlaps NY 7, but only where the Interstate is unsigned, so you might not count that.
—Speaking of NY 7, it seems to be the big ruiner here, as it disqualifies not only I-787, but also I-88 and I-890.
—I-90 gets tantalizingly close, with only a teeny overlap with I-87 to disqualify it.
So the winners are:
78
478
678
878 (?)
481
781
684
787 (?)
290
390 (?)
490
590
690
990
295
495
695
895
Did I miss any?
There are also some US routes that qualify (US 2 being one of them).
Quote from: odditude on February 02, 2015, 09:55:56 AM
Until the construction's done, I-76's eastern terminus is on a multiplex with I-295.
Where?
https://www.google.com/maps/@39.871282,-75.102001,3a,75y,203.9h,90.09t/data=!3m4!1e1!3m2!1sT6l2XnkNFMOVHBSdn7VFyA!2e0
https://www.google.com/maps/@39.871283,-75.101803,3a,75y,353.18h,83.22t/data=!3m4!1e1!3m2!1s70a5eYx-iX3Agm-rJeACMg!2e0
Quote from: 1 on February 01, 2015, 01:26:49 PM
I-91 in Vermont.
Plus many short ones (most 3dis that are 10 miles or shorter would qualify).
I-91 in Connecticut. Conn. 15 flanks it in Meriden, but the two do not share pavement.
Quote from: TheStranger on February 02, 2015, 03:06:29 PM
Quote from: admtrap on February 02, 2015, 03:04:32 PM
For I-210, pretty sure there's an overlap with CA 2 between the Glendale Fwy interchange and the Angeles Crest Hwy exit.
Thanks for catching that one - I updated my list.
US 97 in California doesn't have any concurrencies, I believe.
Quote from: DTComposer on February 02, 2015, 06:37:19 PM
US 97 in California doesn't have any concurrencies, I believe.
Isn't it concurrent with Business I-5 on its southernmost mile?
US 271 in Arkansas is the only one that I can think of.
Quote from: TheStranger on February 02, 2015, 07:15:25 PM
Quote from: DTComposer on February 02, 2015, 06:37:19 PM
US 97 in California doesn't have any concurrencies, I believe.
Isn't it concurrent with Business I-5 on its southernmost mile?
It is. Just had to double check that CA 265 wasn't also in on the action (north half of Bus I-5 only).
I just remembered that in Florida we have 3 US routes not concurrent with any other US route or interstate.
US 29
US 231
US 331
Quote from: roadman65 on February 02, 2015, 09:12:15 PM
I just remembered that in Florida we have 3 US routes not concurrent with any other US route or interstate.
US 29
US 231
US 331
Even if that's true, if it's concurrent with a single state route at any point along its length, it doesn't count.
Quote from: 1 on February 02, 2015, 09:19:43 PM
Even if that's true, if it's concurrent with a single state route at any point along its length, it doesn't count.
It counts if that state route is deliberately unsigned.
But US 331 does overlap US 90.
Quote from: 1 on February 02, 2015, 09:19:43 PM
Quote from: roadman65 on February 02, 2015, 09:12:15 PM
I just remembered that in Florida we have 3 US routes not concurrent with any other US route or interstate.
US 29
US 231
US 331
Even if that's true, if it's concurrent with a single state route at any point along its length, it doesn't count.
They are not signed here. Plus secret routes are not actual routes as far as even map makers are concerned hence they leave it off on many editions.
Edit: I did not realize that US 331 did have an overlap with US 90.
Minnesota's only uncontested winner is US 69. US 65 may or may not count depending on if you count being part of the I-35 business loop in Albert Lea as a duplex.
Quote from: vtk on February 02, 2015, 01:01:05 PM
West Virginia has US 30, US 22, I-470, I-79.
Nope. US 22 has a short concurrency with WV 2. And US 19 is concurrent with I-79 from the north end of Corridor L to the Flatwoods exit.
But US 35, on the other hand, had its concurrency with WV 34 removed when it was relocated.
I didn't see where anyone had started a listing for Virginia that includes US routes, but US 219 would be on the short (pun intended) list.
Quote from: golden eagle on February 01, 2015, 01:07:02 PM
In Mississippi, I-10, I-110 and US 90 along the Gulf Coast are not duplexed with any other highways. In the northern part, US 72 and 78 are by their lonesome, though 78 will become I-22 in the very near future.
I 110 has a concurrency with MS 15 its entire length, unless it was truncated sometime recently.
Maryland: I-81, I-97, I-195, I-270, I-370, and I-895 are on their own. I-68 and I-70 dance with US40. I-95 is concurrent with I-495 on the DC beltway. I-83 is concurrent with I-695 on the Bmore beltway. I-595 is so concurrent with US-50/301 that only people on this Forum know it exists. US50 is concurrent with US301 and US13 at parts. US-29 almost qualifies, but I think it's concurrent with MD410 for a few yards in downtown Silver Spring due to the configuration of the intersection where they cross. US1 shares with things in Baltimore, and with US222 north of that. US 113 is on its own.
Quote from: 1 on February 02, 2015, 05:30:51 PM
There are also some US routes that qualify (US 2 being one of them).
Yeah, I didn't look at US routes yet. Let's see...
US 2 and US 220 count, obviously. Hard to get an overlap into just a few hundred feet!
US 1 and US 9 come in with I-95, US 4 spends lots of time with NY 32, US 6 rides along NY 17, US 9W, US 11, nope...
US 15 did count until I-99 came along. But now, no...
US 20 has a well-known overlap with NY 5...
Oh, yup, there's one other. Can you guess? It's BUS US 62.
Quote from: Bickendan on February 02, 2015, 09:08:58 PM
Quote from: TheStranger on February 02, 2015, 07:15:25 PM
Quote from: DTComposer on February 02, 2015, 06:37:19 PM
US 97 in California doesn't have any concurrencies, I believe.
Isn't it concurrent with Business I-5 on its southernmost mile?
It is. Just had to double check that CA 265 wasn't also in on the action (north half of Bus I-5 only).
True, but are we counting business routes, considering they aren't technically state highways?
Quote from: DTComposer on February 03, 2015, 01:31:24 AM
Quote from: Bickendan on February 02, 2015, 09:08:58 PM
Quote from: TheStranger on February 02, 2015, 07:15:25 PM
Quote from: DTComposer on February 02, 2015, 06:37:19 PM
US 97 in California doesn't have any concurrencies, I believe.
Isn't it concurrent with Business I-5 on its southernmost mile?
It is. Just had to double check that CA 265 wasn't also in on the action (north half of Bus I-5 only).
True, but are we counting business routes, considering they aren't technically state highways?
Yes, because OR 99 and US 30 function as I-5 and I-84's respective business routes.
South Carolina has I-20, I-385, I-520, and I-526.
It seems that every US route in the state has a concurrency, which is easy to understand since there are so many of them. No county in SC is served by fewer than two US routes.
As far as US highways go, in Missouri, looks like US 56 and 275 are the only ones with no overlaps whatsoever.
As for Interstates, we have I-170, I-270 and I-670 running alone, by the looks of it.
Quote from: The High Plains Traveler on February 01, 2015, 10:58:12 PM
Quote from: Eth on February 01, 2015, 10:56:25 PM
Quote from: The High Plains Traveler on February 01, 2015, 10:41:43 PM
In California, I-8, U.S. 6, U.S. 199, U.S. 101 (pretty sure about this).
Doesn't US 101 have a concurrency with CA 1 somewhere? I seem to recall having seen one signed somewhere west of L.A. GMaps shows one in Ventura, maybe it was there.
Yes, but not with any U.S. or Interstate route. I thought this thread was only looking for those.
It's fine if the interstate or U.S. highway is concurrent with a state route. Because there are so many state routes, I intentionally left them off.
Then every US and Interstate route in CA apart from US 50, US 95, I-5, I-10, I-40 and unsigned I-305 :sombrero:.
Damnit, forgot I-80 and I-580...
Utah:
I-215 and US-89A
That's about it, unless you ignore unsigned duplexes and take UDOT's word that US-189 "ends" in Heber City and "shadows" along US-40 and I-80.
Quote from: PHLBOS on February 01, 2015, 05:11:44 PM
PA (off the top of my head)
I-95 (forgot about the short segement that duplexes w/US 322)
I-176
I-276
I-283
I-476
You can add I-86 (if you don't count the segment that comes into PA that NY maintains and has NY-17 on it), & I-579 to that list.
Quote from: robbones on February 02, 2015, 08:06:55 PM
US 271 in Arkansas is the only one that I can think of.
The northernmost 500 feet are duplexed with Truck AR 255.
Quote from: bugo on February 05, 2015, 02:18:34 AM
Quote from: robbones on February 02, 2015, 08:06:55 PM
US 271 in Arkansas is the only one that I can think of.
The northernmost 500 feet are duplexed with Truck AR 255.
The original poster said a few threads up that state roads don't count
Quote from: rickmastfan67 on February 05, 2015, 01:34:46 AM
Quote from: PHLBOS on February 01, 2015, 05:11:44 PM
PA (off the top of my head)
I-95 (forgot about the short segement that duplexes w/US 322)
I-176
I-276
I-283
I-476
You can add I-86 (if you don't count the segment that comes into PA that NY maintains and has NY-17 on it), & I-579 to that list.
Assuming that the two PA segments of I-86 are considered to be one highway/route; it can not be considered a route without a duplex.
OTOH, you're right regarding I-579 and I've since modifed my earlier list.
Quote from: PHLBOS on February 01, 2015, 05:11:44 PM
PA (off the top of my head)
I-95 (forgot about the short segment that duplexes w/US 322)
I-176
I-276
I-283
I-476
I-579
MA
I-84 (though it was once co-signed w/MA 15 many years back)
I-90
I-190
I-290
I-295
I-391
I-395
I would say 495 as well. There's not really a time one is on both 495 and 140, even though 140 flanks 495 for a short stretch.
Quote from: Pete from Boston on February 05, 2015, 10:01:11 AM
Quote from: PHLBOS on February 01, 2015, 05:11:44 PMMA
I-84 (though it was once co-signed w/MA 15 many years back)
I-90
I-190
I-290
I-295
I-391
I-395
I would say 495 as well. There's not really a time one is on both 495 and 140, even though 140 flanks 495 for a short stretch.
It is my understanding that the primary premise of this thread is Interstates and US routes that have
no other shared route along its corridor
whatsoever within a state. By that definition, I-495 in MA would
not meet the OP's criteria due to its short duplex w/MA 140 (which is actually longer in distance than some other-mentioned I/US route duplexes (example: I-287 & NJ 17)).
Quote from: 1 on February 01, 2015, 04:00:03 PM
Is US 160 cheating?
Yes. But its wife is OK with it.
Quote from: US81 on February 01, 2015, 08:05:01 PM
Texas loves to decommission and I may have missed something, but I don't find any US routes in Texas that don't duplex at some point. Regarding Interstates, I think I-610, I-635 and (arguably) I-345 may qualify.
How dare US-54 enter Texas twice! Grrrr....
Quote from: PHLBOS on February 05, 2015, 11:31:23 AM
Quote from: Pete from Boston on February 05, 2015, 10:01:11 AM
Quote from: PHLBOS on February 01, 2015, 05:11:44 PMMA
I-84 (though it was once co-signed w/MA 15 many years back)
I-90
I-190
I-290
I-295
I-391
I-395
I would say 495 as well. There's not really a time one is on both 495 and 140, even though 140 flanks 495 for a short stretch.
It is my understanding that the primary premise of this thread is Interstates and US routes that have no other shared route along its corridor whatsoever within a state. By that definition, I-495 in MA would not meet the OP's criteria due to its short duplex w/MA 140 (which is actually longer in distance than some other-mentioned I/US route duplexes (example: I-287 & NJ 17)).
I took it to mean no formal concurrency, i.e., if you're on one road you're also on the other. I don't think this is the case with 140 and 495.
I-495/140 may be an official overlap, depending on how MassDOT handles ramps, but in reality 140 stays on the C/D roads.
Quote from: NE2 on February 05, 2015, 11:44:35 AM
I-495/140 may be an official overlap, depending on how MassDOT handles ramps, but in reality 140 stays on the C/D roads.
Agreed, in neither direction do you get onto 495 if you are staying on 140.
Quote from: PHLBOS on February 05, 2015, 09:21:37 AM
Quote from: rickmastfan67 on February 05, 2015, 01:34:46 AM
Quote from: PHLBOS on February 01, 2015, 05:11:44 PM
PA (off the top of my head)
I-95 (forgot about the short segement that duplexes w/US 322)
I-176
I-276
I-283
I-476
You can add I-86 (if you don't count the segment that comes into PA that NY maintains and has NY-17 on it), & I-579 to that list.
Assuming that the two PA segments of I-86 are considered to be one highway/route; it can not be considered a route without a duplex.
Is I-86 designated in Bradford County yet?
Quote from: Cjzani on February 05, 2015, 12:19:09 PM
Agreed, in neither direction do you get onto mainline 495 if you are staying on 140.
FTFY.
IIRC, C/D roads are still considered to be part of its parent corridor alignment (in this case I-495).
Not sure about that... In ON 401's case, certainly, but B-30 in Barcelona are the C/D roads for AP-7, yet retains its own route number.
Well, the MassDOT roads layer says the road there is named "INTERSTATE 495 NB CD ROAD" and "INTERSTATE 495 SB CD ROAD," but that its route number is 140.
Make of this what you will.
Does I-15 in Arizona fly solo?
Does US 160 in NM shit in the woods?
Quote from: wriddle082 on February 03, 2015, 05:48:55 AM
South Carolina has I-20, I-385, I-520, and I-526.
It seems that every US route in the state has a concurrency, which is easy to understand since there are so many of them. No county in SC is served by fewer than two US routes.
Quote from: robbones on February 05, 2015, 08:25:26 AM
The original poster said a few threads up that state roads don't count
OK, in that case, the short stretch of ALT US 221 from Chesnee to the NC state line is duplexed with SC 11, but not duplexed with any US routes. So that makes exactly 1 for SC.
Quote from: robbones on February 05, 2015, 08:25:26 AM
The original poster said a few threads up that state roads don't count
Then we can add a few to my list for Georgia: I-575, US 11, US 123, and US 378.
Interstate 15 in CA
Quote from: NE2 on February 05, 2015, 02:02:27 PM
Does US 160 in NM shit in the woods?
Not enough trees along 160 in NM to be called a wood.
Since state routes don't count I guess, Minnesota gains I-494 and I-35W (35W doesn't duplex with 94; it's solely a common section). 35W could have counted from the beginning but I forgot to include it or was thinking of I-35 in general which does not count in either format.
California has
US 6
US 50 (concurrent with CA 89)
US 95 (concurrent with I-10 and I-40)
US 97
US 101 (concurrent with CA 2, CA 23, CA 1 [four times], CA 166, CA 46, CA 156, CA 152, CA 84, CA 116, CA 128, CA 20)
US 199
US 395 (concurrent with CA 168, CA 120, and CA 299)
I-5 (concurrent with I-10, CA 33, CA 4, CA 113)
I-105
I-205
I-405 (concurrent with CA 22)
I-605
I-805
I-8
I-10 (concurrent with I-5, US 95)
I-110
I-210 (concurrent with CA 2)
I-710
I-15 (concurrent with CA 79, CA 18)
I-215 (concurrent with CA 74, CA 60)
I-40 (concurrent with US 95)
I-80 (concurrent with I-580, CA 12, CA 113, CA 89)
I-280 (concurrent with CA 35, CA 1)
I-380
I-580 (concurrent with I-80)
I-680 (concurrent with CA 84 [northbound only])
I-780
I-880 (concurrent with CA 84)
I-980
Non-duplexed Interstate and US Routes in Wisconsin are....
ONLY I-794!!!
Amazing for a state that likes x-plexing so much that it will put 4 US Routes on one road and 3 Interstates on another. Not to mention there is an I-US-WIS-CTH medley somewhere.
Quote from: SSOWorld on February 05, 2015, 08:32:19 PM
Non-duplexed Interstate and US Routes in Wisconsin are....
ONLY I-794!!!
Amazing for a state that likes x-plexing so much that it will put 4 US Routes on one road and 3 Interstates on another. Not to mention there is an I-US-WIS-CTH medley somewhere.
I would say that WI 35 is at fault for invalidating several routes, just by looking at Google Maps.
WI 35 is a logical route that hugs the west edge of the state. Some other routes are not so logical.
Quote from: JustDrive on February 05, 2015, 08:20:24 PM
California has
US 6
US 50 (concurrent with I-305, CA 89 and CA 99)
US 95 (concurrent with I-10 and I-40)
US 97
US 101 (concurrent with CA 2, CA 23, CA 1 [four times], CA 166, CA 46, CA 156, CA 152, CA 84, CA 116, CA 128, CA 20)
US 199
US 395 (concurrent with CA 168, CA 120, and CA 299)
I-5 (concurrent with I-10, CA 33, CA 4, CA 113)
I-105
I-205
I-305 (concurrent with US 50 and CA 99)
I-405 (concurrent with CA 22)
I-605
I-805
I-8
I-10 (concurrent with I-5, US 95)
I-110
I-210 (concurrent with CA 2)
I-710
I-15 (concurrent with CA 79, CA 18)
I-215 (concurrent with CA 74, CA 60)
I-238
I-40 (concurrent with US 95)
I-80 (concurrent with I-580, CA 12, CA 113, CA 89)
I-280 (concurrent with CA 35, CA 1)
I-380
I-580 (concurrent with I-80)
I-680 (concurrent with CA 84 [northbound only])
I-780
I-880 (concurrent with CA 84)
I-980
Fixed :sombrero:. I-305 exists, albeit unsigned, so this invalidates US 50 for the purposes of this thread. As I said previously, CA has all but every 2di (I-8 being the exception), unsigned I-305, I-580, US 50 and US 95, without concurrencies with another interstate or US route. I like how many concurrencies US 101 has, but due to all of them being with state routes it still qualifies (The OP excluded those so states like AL, GA, FL which put a hidden state route in all their routes could appear here).
QuoteFixed :sombrero:. I-305 exists, albeit unsigned, so this invalidates US 50 for the purposes of this thread. As I said previously, CA has all but every 2di (I-8 being the exception), unsigned I-305, I-580, US 50 and US 95, without concurrencies with another interstate or US route. I like how many concurrencies US 101 has, but due to all of them being with state routes it still qualifies (The OP excluded those so states like AL, GA, FL which put a hidden state route in all their routes could appear here).
Wait, I think there may be one more.
I-505. I don't think that shares pavement with any state route, does it?
Well, if state routes don't count, then US 79 and I-65 go back on the list for Kentucky.
Personally, I find the exercise more fun not excluding SRs.
Quote from: Pete from Boston on February 02, 2015, 05:46:18 PM
Quote from: 1 on February 01, 2015, 01:26:49 PM
I-91 in Vermont.
Plus many short ones (most 3dis that are 10 miles or shorter would qualify).
I-91 in Connecticut. Conn. 15 flanks it in Meriden, but the two do not share pavement.
Almost the same deal in Hartford too.
I-291, I-384, I-395, I-684 :sombrero: and I-691 also qualify in CT. The only case you can make for RI is I-295 if you consider the fact that US 6 stays on the c/d roads between exits 5 and 6.
QuoteSince state routes don't count I guess, Minnesota gains I-494 and I-35W (35W doesn't duplex with 94; it's solely a common section).
You forget that 35W and US 10 are concurrent in Arden Hills, so 35W would still be off the list.
Quote from: NE2 on February 05, 2015, 08:56:44 PM
WI 35 is a logical route that hugs the west edge of the state. Some other routes are not so logical.
Tell that to River Falls. :evilgrin:
Quote from: froggie on February 06, 2015, 05:04:42 PM
QuoteSince state routes don't count I guess, Minnesota gains I-494 and I-35W (35W doesn't duplex with 94; it's solely a common section).
You forget that 35W and US 10 are concurrent in Arden Hills, so 35W would still be off the list.
U.S. 69 and U.S. 8 count, though. U.S. 65 would, but business loop 35.
Quote from: Molandfreak on February 06, 2015, 06:56:10 PM
Quote from: NE2 on February 05, 2015, 08:56:44 PM
WI 35 is a logical route that hugs the west edge of the state. Some other routes are not so logical.
Tell that to River Falls. :evilgrin:
Tell River Falls that CTH F isn't a state highway. Durr.
A better response would have been "tell that to Cassville". In that case, history is to blame. But it's not exactly a big deal, since the GRR is signed through Cassville.
Quote from: CNGL-Leudimin on February 06, 2015, 10:00:17 AM
(The OP excluded those so states like AL, GA, FL which put a hidden state route in all their routes could appear here).
They are only hidden on the Interstates in Georgia. All the State Routes that are assigned to US Highways are fully posted there.
Full list for Nevada. This includes alternates (since most U.S. Alternate routes in Nevada are effectively mainline highways), but not other banners.
I-15 - overlaps US 93
I-80 - overlaps US 95 Alt, US 95, US 93 Alt
I-215 - No overlap
I-515 - overlaps US 93, US 95
I-580 - overlaps US 395; future additional overlap with US 50
US 6 - overlaps US 50, US 93, US 95
US 50 - overlaps US 6, US 93, US 95 (for one block), US 395; future additional overlap with I-580
US 50 Alt - overlaps with US 95 Alt
US 93 - overlaps I-15, US 95
US 93 Alt - overlaps with I-80
US 95 - overlaps I-80, I-515, US 6, US 50 (for one block), US 93
US 95 Alt - overlaps with I-80, US 50 Alt
US 395 - overlaps with I-580, US 50
US 395 Alt - No overlap
EDIT: Forgot I-80 overlap on US 95A
Revised list for Louisiana:
I-12
I-110
I-210
I-220
I-610
I-310 and I-510 only share with LA routes
US 65 can be added.
All other US routes in Louisiana share pavement with another US or Interstate highway.
Illinois has two:
I-190
I-355
I-474 was until recently when US-24 was put on it to cross the Illinois River.
I-172 could be one, if you consider IL-110 to be just a marketing gimmick instead of a legitimate state route.
All of the US routes are concurrent with something else at one point or another. US-14 comes the closest, but it has a very short concurrency with IL-43.
Quote from: froggie on February 06, 2015, 05:04:42 PM
QuoteSince state routes don't count I guess, Minnesota gains I-494 and I-35W (35W doesn't duplex with 94; it's solely a common section).
You forget that 35W and US 10 are concurrent in Arden Hills, so 35W would still be off the list.
And 494 is paired with MN 5 for a good stretch.
Quote from: Coelacanth on February 10, 2015, 10:07:37 AM
Quote from: froggie on February 06, 2015, 05:04:42 PM
QuoteSince state routes don't count I guess, Minnesota gains I-494 and I-35W (35W doesn't duplex with 94; it's solely a common section).
You forget that 35W and US 10 are concurrent in Arden Hills, so 35W would still be off the list.
And 494 is paired with MN 5 for a good stretch.
Can't believe I didn't catch that one.
OK, I missed where it said SR's don't count, but in that case, here's NY again. (Routes in bold qualify with or without the SR exception.)
Interstate:
78
278
478
678
878
81
481
781
84
684
87 (I-287, I-90)
287 (I-87)
587
787
88
90 (I-87)
190
290
390
490
590
690
790
890
990
95 (US 1, US 9)
295
495
695
895
99 (US 15)
US:
2
4
6 (US 202, US 209)
9 (I-95, US 20)
9W (US 44)
11
15 (I-99)
20 (US 9)
20A
44 (US 9W)
62
BUS 62
202 (US 6)
209 (US 6)
219 (I-86)
BUS 219
220
Quote from: kphoger on February 10, 2015, 01:37:03 PM
Quote from: Coelacanth on February 10, 2015, 10:07:37 AM
Quote from: froggie on February 06, 2015, 05:04:42 PM
QuoteSince state routes don't count I guess, Minnesota gains I-494 and I-35W (35W doesn't duplex with 94; it's solely a common section).
You forget that 35W and US 10 are concurrent in Arden Hills, so 35W would still be off the list.
And 494 is paired with MN 5 for a good stretch.
Can't believe I didn't catch that one.
You didn't miss MN 5. It was excluded because it was a state route.
(I still think state routes should count.)
Quote from: 1 on February 10, 2015, 02:29:33 PM
Quote from: kphoger on February 10, 2015, 01:37:03 PM
Quote from: Coelacanth on February 10, 2015, 10:07:37 AM
Quote from: froggie on February 06, 2015, 05:04:42 PM
QuoteSince state routes don't count I guess, Minnesota gains I-494 and I-35W (35W doesn't duplex with 94; it's solely a common section).
You forget that 35W and US 10 are concurrent in Arden Hills, so 35W would still be off the list.
And 494 is paired with MN 5 for a good stretch.
Can't believe I didn't catch that one.
You didn't miss MN 5. It was excluded because it was a state route.
(I still think state routes should count.)
So the list is (excluding state route concurrencies): U.S. 8, U.S. 69, I-494. The only route that qualifies including state routes is U.S. 69. :nod:
Thinking about this for Vermont...the only routes this would apply to are I-89 and I-189. I-91 and I-93 technically have a TRUCK US 2 on them, and each of the US routes in the state has a concurrency with each other US route it crosses (US 2/302 don't count here as 302 doesn't cross 2).
Vermont only has four junctions between all its US routes. 3 out of 4 is not bad for the US routes anyway.
Yes, the truck US 2 is the only holdback for giving the Green Mountain State a clean bill of health for Interstate/ US route concurrencies.
However, look at the bright side of things, still a perfect record for mainline US highways though.
QuoteVermont only has four junctions between all its US routes. 3 out of 4 is not bad for the US routes anyway.
2/5
2/7
2/302
4/5
4/7
5/302
Quote from: Ian on February 01, 2015, 05:42:13 PM
I-195 in Saco/OOB is the only interstate in Maine without any duplexes if you don't count the Falmouth Spur (hidden I-495). All other US and interstates in the state have at least one duplex somewhere along their routes.
Not quite: I-195 west does officially carry ME5 north. ME5 south is still on Ocean Park Rd.
Exclusion of State Routes doesn't change WI's list.
Since nobody has exhaustively run through Connecticut yet...
Interstates:
84 - nope, US 6/7/44/202
91 - yep
95 - nope, US 1
291 - yep
384 - yep
395 - yep if SRs don't count, nope if they do (CT 2A)
684 - yep
691 - yep
US routes:
1 - nope, I-95
5 - nope, US 44
6 - nope, I-84/US 7/44/202
7 - nope, I-84/US 6/44/202
44 - nope, I-84/US 6/7/202
202 - nope I-84/US 6/7/44
There's a pattern here. :P
US 5 is concurrent with CT 15 south of Hartford. :D
Quote from: roadman65 on March 07, 2015, 12:56:54 PM
US 5 is concurrent with CT 15 south of Hartford. :D
I am aware, but that is irrelevant since its concurrency with US 44 disqualifies it and the OP said concurrencies with state highways don't count.