Curious to know what highways (either within a single state or spanning multiple) qualify.
For Washington, the winner is US 101, which clocks in at 366 miles and does not share an inch of asphalt with another route (though with one-way streets it technically might).
For a Michigan state highway it's M-57.
For US highways it's US-24.
For Interstate highways it's I-696.
For Indiana:
Overall it's I-64 at 123 miles
For US highways, all of them except for the 0.64 miles of US 131 have concurrencies.
For state highways, the longest I can find is the northern segment of IN 63 at 63 miles.
Colorado
Interstate: I-225 - 12 Miles (the only one)
U.S. Highway: US350 - 72 miles
State Highway: CO149 - 118 miles
Wyoming
Interstate: None
U.S. Highway: None
State Highway: WYO28 - 96 miles
Massachusetts I believe would be I-90. MA 28 and US 20 are the only things longer and they have concurrencies with tons of things.
New Hampshire (and I had to look this up to confirm) is NH 175, just over 25 miles by itself. NH 110 is just behind it a half mile shorter.
In Alaska, AK 2 has no concurrencies (except with unsigned Interstates) for its entire ~445-mile length. Ditto AK 11, for its entire 416-mile length, except with no paper-Interstate concurrencies.
In the Northwest Territories, NT 1 has no concurrencies for its entire ~430-mile length (including two ferry crossings).
Are double concurrencies allowed?
Fairly certain it's CA 96 for California at 147 miles.
Louisiana:
Interstate: I-12, 86 miles
US Route: none. US 65 is probably closest, just 2 small concurrencies
State Route: will take some research. There's lots of concurrencies
iPhone
Quote from: bassoon1986 on December 03, 2021, 09:30:11 AM
Louisiana:
Interstate: I-12, 86 miles
US Route: none. US 65 is probably closest, just 2 small concurrencies
State Route: will take some research. There's lots of concurrencies
iPhone
Not to steal your thunder, but looks like LA77 at 49.2 miles.
Quote from: jayhawkco on December 03, 2021, 09:39:41 AM
Quote from: bassoon1986 on December 03, 2021, 09:30:11 AM
Louisiana:
Interstate: I-12, 86 miles
US Route: none. US 65 is probably closest, just 2 small concurrencies
State Route: will take some research. There's lots of concurrencies
iPhone
Not to steal your thunder, but looks like LA77 at 49.2 miles.
Nice! I really thought there might be one that broke 50 miles but like I said, Louisiana has lots of concurrencies. Even if it's just from a lot of zig-zag intersections where the other route crosses for a few blocks.
iPhone
Quote from: bassoon1986 on December 03, 2021, 09:54:54 AM
Quote from: jayhawkco on December 03, 2021, 09:39:41 AM
Quote from: bassoon1986 on December 03, 2021, 09:30:11 AM
Louisiana:
Interstate: I-12, 86 miles
US Route: none. US 65 is probably closest, just 2 small concurrencies
State Route: will take some research. There's lots of concurrencies
iPhone
Not to steal your thunder, but looks like LA77 at 49.2 miles.
Nice! I really thought there might be one that broke 50 miles but like I said, Louisiana has lots of concurrencies. Even if it's just from a lot of zig-zag intersections where the other route crosses for a few blocks.
iPhone
LA 23 might count at 74 miles. Depends on if you call it a concurrency with Bus US 90. It stays on the frontage roads.
iPhone
Quote from: bassoon1986 on December 03, 2021, 09:56:38 AM
Quote from: bassoon1986 on December 03, 2021, 09:54:54 AM
Quote from: jayhawkco on December 03, 2021, 09:39:41 AM
Quote from: bassoon1986 on December 03, 2021, 09:30:11 AM
Louisiana:
Interstate: I-12, 86 miles
US Route: none. US 65 is probably closest, just 2 small concurrencies
State Route: will take some research. There's lots of concurrencies
iPhone
Not to steal your thunder, but looks like LA77 at 49.2 miles.
Nice! I really thought there might be one that broke 50 miles but like I said, Louisiana has lots of concurrencies. Even if it's just from a lot of zig-zag intersections where the other route crosses for a few blocks.
iPhone
LA 23 might count at 74 miles. Depends on if you call it a concurrency with Bus US 90. It stays on the frontage roads.
iPhone
I looked at that briefly but just went by the Wikipedia article saying it was concurrent. I didn't investigate too thoroughly.
For Oregon, it'll OR 127 by technicality - the ORH system overlaps every route, US highway, or Interstate save for a few routes without corresponding highways, like 132.
Without considering ORH, interstates still fail:
5 - 99, 138, 99E, 30
82 - 395
84 - 30, 395
105 - 126
205 - 213
405 - 26, 30
US:
20 - 34, 99W, 99E, 126, 97B, 395, 26, 201
26 - 47, 405, 97, 395, 20, 201
30 - 405, 5, 84, 35, 197, 37, 7
97 - 26
101 - passes
197 - 30, 216
395 - 82, 730, 84, 30, 26, 20, 140
OR:
31 stands out as the likely winner
For Ontario:
400-series Highways - The 417 at 192.0 km (119.3 mi) (third longest 400-series Highway)
King's Highways - Highway 144 at 271.7 km (168.8 mi) (sixth longest King's Highway)
Secondary Highways - Highway 599 at 291.0 km (180.8 mi) (also the longest Secondary Highway)
Tertiary Highways - Highway 811 at 59.0 km (36.7 mi) (also the longest Tertiary Highway)
In West Virginia, the longest overlap-free route is WV 26 at 41.3 miles. Concurrency-free routings are fairly rate because of the terrain (hard to arrange things on grids like in states further west) and because of WV's propensity for trying to minimize the number of state route numbers at the cost of long distance multiplexes (see WV 28 as an example).
CT:
Interstate: I-91 at 58 miles
US: All have concurrencies
State: CT 58 at 18.58 miles
For Alabama:
I-10 @ 67 miles
US45 @ 59 miles
AL75 @ 115 miles
Quote from: Flint1979 on December 03, 2021, 06:57:41 AM
For US highways it's US-24.
I'm assuming you just mean within Michigan, right? Nationally, I know that right near where I live, US 24 is concurrent with US 40 between Lawrence, KS, and KC.
Ohio
I - 270 (also one of the very few beltways that doesn't have any concurrencies)
US - None
SR - Too lazy to check all of them. Though of the routes I know of, 63 is the only one that doesn't have any concurrencies.
Quote from: cabiness42 on December 03, 2021, 07:28:43 AM
For Indiana:
Overall it's I-64 at 123 miles
Ahem...
(https://live.staticflickr.com/65535/51418264268_73d1292d45_z.jpg) (https://flic.kr/p/2mkE3zJ)2021 Western road trip Day 14 - 103 (https://flic.kr/p/2mkE3zJ) by H.B. Elkins (https://www.flickr.com/photos/hbelkins/), on Flickr
Quote from: SkyPesos on December 03, 2021, 11:36:54 AM
Ohio
I - 270 (also one of the very few beltways that doesn't have any concurrencies)
US - None
SR - Too lazy to check all of them. Though of the routes I know of, 63 is the only one that doesn't have any concurrencies.
Looks like OH534 at 69.41 miles.
Taking a swing at Maryland (credit to Wikipedia for some assistance):
Interstate: I-270 at 34 miles*
US: US 113 at 38 miles
State: MD 32 at 52 miles**
*If you discount the I-95/495 concurrency (I personally don't, but IIRC the I-495 designation was restored on the eastern half of the beltway for motorist convenience and may not have ever been officially restored per FHWA), then I-95 would take the title at 109 miles. Additional sidenote: if you limit to 2di's and count the I-95/495 overlap, then I-97 would take the title in a somewhat ironic twist :-D
**I originally thought it would be MD 213 at 68 miles, but Wikipedia indicates a one-way/one-block unsigned overlap between MD 213 NB & MD 304 WB in downtown Centreville in Queen Anne's County.
Quote from: KCRoadFan on December 03, 2021, 11:35:38 AM
Quote from: Flint1979 on December 03, 2021, 06:57:41 AM
For US highways it's US-24.
I'm assuming you just mean within Michigan, right? Nationally, I know that right near where I live, US 24 is concurrent with US 40 between Lawrence, KS, and KC.
Off the top of my head, I also recall some overlaps with US 285 & I-25 when I was out in Colorado almost a year ago.
MN
I-: none
US: none
MN: MN 61 (149 miles)
New Mexico
Interstate: None
US Highway: US82 - 193 miles
State Highway: NM120 - 119 miles (also the longest state highway)
Idaho
Interstate: I-90 - 74 miles
US Highway: US195 - 0.577 miles
State Highway: ID75 - 171 miles (also the longest state highway)
Quote from: jmacswimmer on December 03, 2021, 11:51:14 AM
Quote from: KCRoadFan on December 03, 2021, 11:35:38 AM
Quote from: Flint1979 on December 03, 2021, 06:57:41 AM
For US highways it's US-24.
I'm assuming you just mean within Michigan, right? Nationally, I know that right near where I live, US 24 is concurrent with US 40 between Lawrence, KS, and KC.
Off the top of my head, I also recall some overlaps with US 285 & I-25 when I was out in Colorado almost a year ago.
It has tons of concurrencies in CO. US285, CO67, I-25, CO21, US40, US287, I-70, and US385.
North Carolina: probably NC-12 along the Outer Banks. It's 148 miles, including both of the ferry routes. In addition to not having any concurrencies, it only connects with US-70 in Sea Level. The junction with NC-45 is virtual (since NC-12 sits alongside the ferry dock for NC-45 at Ocracoke). Then at the two interconnections on the Outer Banks (first with the terminii of US-64 and US-158 at Whalebone Junction, and the other one with US-158 at Duck) neither one actually intersects with NC-12.
Quote from: jmacswimmer on December 03, 2021, 11:51:14 AM
Interstate: I-270 at 34 miles*
Along with I-270 in OH I mentioned above, I-270 is also the longest interstate without a concurrency in Missouri. So that's 3 of the 4 270 variants!
For Utah:
Interstates - all 2dis overlap at least one other interstate or US route somewhere in the state, leaving I-215 as winner by default
15: 50, 6, 89, 80, 84, (30)
70: 89, 50, 191, 6
80: 15, 189
84: (30), 15
215: none - 28.9 miles
US Highways - all but two definitely have a concurrency, and another one maybe does depending on whose documentation you look at. If you trust AASHTO and signs, the winner is US 163 at 41.4 miles in the state. If you trust UDOT, it's US 491 at 17 miles.
6: 50, 15, 89, 191, 70, 50
40: 189, 191
50: 6, 15, 89, 70, 191, 6
89: 70, 50, 6, 15, 91
91: 89
163: (191) - 41.4 miles
189: 40, 80
191: (163), 70, 50, 6, 40
491: none - 17.0 miles
US 163 ends at US 191 southwest of Bluff according to both AASHTO (since 2008) and signage on the ground (since 2004), but UDOT documentation maintains a concurrency with 191 all the way up to I-70 at Crescent Jct.
State Routes - SR concurrencies are quite rare in this state. SR 30 is the longest route in the state, but only when you include a couple of unsigned concurrencies with interstates and US highways (in Utah, state routes do not increase mileage along concurrencies where they are not the primary route). So that means Utah's winner is SR 24 at 160.3 miles.
Montana:
Interstates - If business loops don't count as a concurrency, I-115 in Butte is 1.9 miles. If you count concurrent business loops, all Interstates in MT have concurrencies.
US - All US Highways have concurrencies.
State - Again not counting business loops, MT 59 is 195 miles. Otherwise MT 24 holds the title with 134 miles.
North Dakota:
Interstates - I-194 in Bismarck is 1.1 miles.
US - Not counting business loops, US 10 is 8 miles. Otherwise, all US Highways have concurrencies.
State - ND 14 is 175 miles according to Wiki.
Arizona
Interstate - I-8 at 173.33 miles (only interstate in AZ that qualifies)
US Highway - US 89A at 86.90 miles
State Highway - SH86 at 118.12 miles
Quote from: KCRoadFan on December 03, 2021, 11:35:38 AM
Quote from: Flint1979 on December 03, 2021, 06:57:41 AM
For US highways it's US-24.
I'm assuming you just mean within Michigan, right? Nationally, I know that right near where I live, US 24 is concurrent with US 40 between Lawrence, KS, and KC.
Yep no concurrencies along it in Michigan.
Quote from: hbelkins on December 03, 2021, 11:40:29 AM
Quote from: cabiness42 on December 03, 2021, 07:28:43 AM
For Indiana:
Overall it's I-64 at 123 miles
Ahem...
(https://live.staticflickr.com/65535/51418264268_73d1292d45_z.jpg) (https://flic.kr/p/2mkE3zJ)2021 Western road trip Day 14 - 103 (https://flic.kr/p/2mkE3zJ) by H.B. Elkins (https://www.flickr.com/photos/hbelkins/), on Flickr
Well, there is always I-275 at 3.16 miles.
Quote from: cabiness42 on December 03, 2021, 07:28:43 AM
For Indiana:
Overall it's I-64 at 123 miles
For US highways, all of them except for the 0.64 miles of US 131 have concurrencies.
For state highways, the longest I can find is the northern segment of IN 63 at 63 miles.
I-64 has concurrency with IN 62 beginning at MM 118 and then US 150 beginning at MM 119
Illinois highways have concurrencies so frequently that I think the answer for Illinois state routes is IL-125, at only 37 miles. IL-25 isn't far behind at 35 miles. The concurrency-free highway with the most mileage in Illinois looks like Interstate 24, oddly, at 39 miles. Every other 2di in Illinois has a concurrency somewhere in the state. Every US highway in Illinois has a concurrency somewhere in the state.
Quote from: SectorZ on December 03, 2021, 09:11:49 AM
Massachusetts I believe would be I-90. MA 28 and US 20 are the only things longer and they have concurrencies with tons of things.
New Hampshire (and I had to look this up to confirm) is NH 175, just over 25 miles by itself. NH 110 is just behind it a half mile shorter.
For Mass., i-90 East has an unsigned concurrency with MA 1A from I-93 to its end in East Boston, but the first 133 miles are concurrency free. Then there's about 52 miles of I-95, excluding the 128 concurrency.
Quote from: CardInLex on December 03, 2021, 08:36:46 PM
Quote from: cabiness42 on December 03, 2021, 07:28:43 AM
For Indiana:
Overall it's I-64 at 123 miles
For US highways, all of them except for the 0.64 miles of US 131 have concurrencies.
For state highways, the longest I can find is the northern segment of IN 63 at 63 miles.
I-64 has concurrency with IN 62 beginning at MM 118 and then US 150 beginning at MM 119
Forgot about those, was just thinking about concurrencies with other interstates. No interstates in Indiana without concurrencies then.
Florida would count for I-10 and I-4, but you have those unsigned state numbers like SR 8 and SR 400. For I-95 now you have both US 1 and US 17, but if I-75 wasn't SR 93 it would be the winner in the state.
Quote from: cabiness42 on December 03, 2021, 10:23:37 PM
Forgot about those, was just thinking about concurrencies with other interstates. No interstates in Indiana without concurrencies then.
I-275?
Quote from: roadman65 on December 03, 2021, 11:06:24 PM
Florida would count for I-10 and I-4, but you have those unsigned state numbers like SR 8 and SR 400.
I wouldn't count unsigned state highway counterparts as concurrencies, honestly.
For Québec highways, QC-167 is probably the winner, though QC-389 might also be up there.
Quote from: Max Rockatansky on December 03, 2021, 09:22:27 AM
Fairly certain it's CA 96 for California at 147 miles.
Wouldn't Interstate 8 qualify at 178 miles?
Would I-8 be the longest interstate overall without concurrencies? I don't see any green highlighted boxes when skimming its Wikipedia page.
Quote from: jayhawkco on December 03, 2021, 08:41:51 AM
Colorado
Interstate: I-225 - 12 Miles (the only one)
U.S. Highway: US350 - 72 miles
State Highway: CO149 - 118 miles
Wyoming
Interstate: None
U.S. Highway: None
State Highway: WYO28 - 96 miles
co 14 has to come in second for state highways, 92 miles from walden (where it runs with 125 for a minute) to teds place (where it either pauses, or runs with 287)
Quote from: SkyPesos on December 03, 2021, 11:10:34 PM
Quote from: cabiness42 on December 03, 2021, 10:23:37 PM
Forgot about those, was just thinking about concurrencies with other interstates. No interstates in Indiana without concurrencies then.
I-275?
Correct. As mentioned above.
Even US 131 is (or at least used to be) also considered SR 13, although it is not signed that way.
Quote from: zachary_amaryllis on December 04, 2021, 03:35:06 AM
Quote from: jayhawkco on December 03, 2021, 08:41:51 AM
Colorado
Interstate: I-225 - 12 Miles (the only one)
U.S. Highway: US350 - 72 miles
State Highway: CO149 - 118 miles
Wyoming
Interstate: None
U.S. Highway: None
State Highway: WYO28 - 96 miles
co 14 has to come in second for state highways, 92 miles from walden (where it runs with 125 for a minute) to teds place (where it either pauses, or runs with 287)
I don't think the OP intended longest stretch without a concurrency, just a route that didn't have any.
Quote from: bob7374 on December 03, 2021, 10:07:04 PM
Quote from: SectorZ on December 03, 2021, 09:11:49 AM
Massachusetts I believe would be I-90. MA 28 and US 20 are the only things longer and they have concurrencies with tons of things.
New Hampshire (and I had to look this up to confirm) is NH 175, just over 25 miles by itself. NH 110 is just behind it a half mile shorter.
For Mass., i-90 East has an unsigned concurrency with MA 1A from I-93 to its end in East Boston, but the first 133 miles are concurrency free. Then there's about 52 miles of I-95, excluding the 128 concurrency.
I thought MA 1A went through the Callahan/Sumner tunnels and would stay on 93/1/3 as a silent concurrency with its parent up to the junction. Otherwise, 495 would be the longest in MA.
If the OP meant single routes end to end no matter what states, GA is definitely out, unless you count the small SPUR designations or small three digit rural highways.
I-794 is the only Interstate in WI that qualifies (3.5 miles).
All of the US routes have a concurrency at one point.
The longest state route without a concurrency could very well be WI-153 (61 miles).
In VA, the longest "solo" interstate is 295, 52.75 around the east and north sides of Richmond.
Longest US route here is a pickle–but it looks like (as fair as mainline route go) it's 219, with a whopping 1.3 miles.
Finally, for state routes, VA 28 takes the cake, at 49 miles, from a rural 2 laner from Remington, up to Manassas and then a massive 6/8 lane freeway through suburban/exurban areas in Fairfax and Loudon counties, passing Dulles airport. It's an interesting drive for sure to get the radical change in the route as you drive it.
For New Jersey...
I believe the GSP wins in NJ, at 88 miles (around MP 84 to MP 172 at the NY State border).
If you wanna get technical with the wording "longest highway", the NJ Turnpike, as a highway, doesn't have a concurrency for 117 or so continuous miles, with its sole concurrency being from MP 0 to MP 0.9 with US 40. The remainder of the highway has two different route numbers, but they never overlap.
Nevada:
Interstate: I-215, 12.796 miles (by default, no other candidates)
US route: US 395A, 20.081 miles (also by default)
State route: SR 318, 110.737 miles (in a squeaker over SR 140, 110.057 miles)
Quote from: roadman65 on December 04, 2021, 10:00:41 AM
If the OP meant single routes end to end no matter what states, GA is definitely out, unless you count the small SPUR designations or small three digit rural highways.
GA 141 in particular comes to mind as a decent length example, with no concurrencies of any kind in its 34.1 miles.
It would take a long time to go through all of the state highways and check for overlaps, but there are a whole bunch of entirely independent routes even in more urban areas (though yes they are mostly short). Off the top of my head, in addition to 141 we also have 84, 237, 264, 279, 314, 317, 331, 347, and 378 in the Atlanta area with no overlaps of any kind along them.
Pennsylvania:
Interstate (and overall): I-476, 132.10 miles. Longest primary Interstate without an overlap is I-90 at 46.4 miles.
US Route: US 206, 0.46 miles. This is also the second shortest of any state, US, or Interstate route in PA, and the shortest one signed (PA 299 is the shortest, but unsigned).
State: PA 187, 43.13 miles
Quote from: jp the roadgeek on December 04, 2021, 09:46:24 AM
Quote from: bob7374 on December 03, 2021, 10:07:04 PM
Quote from: SectorZ on December 03, 2021, 09:11:49 AM
Massachusetts I believe would be I-90. MA 28 and US 20 are the only things longer and they have concurrencies with tons of things.
New Hampshire (and I had to look this up to confirm) is NH 175, just over 25 miles by itself. NH 110 is just behind it a half mile shorter.
For Mass., i-90 East has an unsigned concurrency with MA 1A from I-93 to its end in East Boston, but the first 133 miles are concurrency free. Then there's about 52 miles of I-95, excluding the 128 concurrency.
I thought MA 1A went through the Callahan/Sumner tunnels and would stay on 93/1/3 as a silent concurrency with its parent up to the junction. Otherwise, 495 would be the longest in MA.
You and I thought that because it does.
Quote from: thspfc on December 04, 2021, 10:34:55 AM
I-794 is the only Interstate in WI that qualifies (3.5 miles).
All of the US routes have a concurrency at one point.
The longest state route without a concurrency could very well be WI-153 (61 miles).
WI-153 has a "hidden" concurency with Marathon County J east of Mosinee. Wisconsin has a lot of those with county highways. Are those actually concurrencies if they aren't signed?
Quote from: SEWIGuy on December 05, 2021, 09:40:30 AM
Quote from: thspfc on December 04, 2021, 10:34:55 AM
I-794 is the only Interstate in WI that qualifies (3.5 miles).
All of the US routes have a concurrency at one point.
The longest state route without a concurrency could very well be WI-153 (61 miles).
WI-153 has a "hidden" concurency with Marathon County J east of Mosinee. Wisconsin has a lot of those with county highways. Are those actually concurrencies if they aren't signed?
Didn't even think about concurrencies with county highways.
There's an odd one on CTH-CV in Windsor. It runs eastward along WI-19 for a mile to US-51, then it turns south onto US-51 for 1.5 miles. It is (subtly) signed at the 51 and 19 interchange: https://www.google.com/maps/@43.1946114,-89.3262852,3a,15y,102.24h,89.47t/data=!3m6!1e1!3m4!1s8I9fiVaE39hM-uS7fgAohw!2e0!7i16384!8i8192
https://www.google.com/maps/@43.1946114,-89.3262852,3a,15y,102.24h,89.47t/data=!3m6!1e1!3m4!1s8I9fiVaE39hM-uS7fgAohw!2e0!7i16384!8i8192
^^ There is CTH K i Waupaca County which has a silent concurrency with US 10/WI 22,49,54.
Quote from: SectorZ on December 05, 2021, 09:08:40 AM
Quote from: jp the roadgeek on December 04, 2021, 09:46:24 AM
Quote from: bob7374 on December 03, 2021, 10:07:04 PM
Quote from: SectorZ on December 03, 2021, 09:11:49 AM
Massachusetts I believe would be I-90. MA 28 and US 20 are the only things longer and they have concurrencies with tons of things.
New Hampshire (and I had to look this up to confirm) is NH 175, just over 25 miles by itself. NH 110 is just behind it a half mile shorter.
For Mass., i-90 East has an unsigned concurrency with MA 1A from I-93 to its end in East Boston, but the first 133 miles are concurrency free. Then there's about 52 miles of I-95, excluding the 128 concurrency.
I thought MA 1A went through the Callahan/Sumner tunnels and would stay on 93/1/3 as a silent concurrency with its parent up to the junction. Otherwise, 495 would be the longest in MA.
You and I thought that because it does.
I thought there was something about 1A being rerouted to I-90 because the I-93 tunnel lacks some movements to/from the Sumner/Callahan tunnels that the old Central Artery had.
Vermont:
I-91 (177.4 miles)
US 4 Business (4.3 miles)
VT 102 (43.7 miles)
Quote from: thspfc on December 05, 2021, 09:48:27 AM
Quote from: SEWIGuy on December 05, 2021, 09:40:30 AM
Quote from: thspfc on December 04, 2021, 10:34:55 AM
I-794 is the only Interstate in WI that qualifies (3.5 miles).
All of the US routes have a concurrency at one point.
The longest state route without a concurrency could very well be WI-153 (61 miles).
WI-153 has a "hidden" concurency with Marathon County J east of Mosinee. Wisconsin has a lot of those with county highways. Are those actually concurrencies if they aren't signed?
Didn't even think about concurrencies with county highways.
There's an odd one on CTH-CV in Windsor. It runs eastward along WI-19 for a mile to US-51, then it turns south onto US-51 for 1.5 miles. It is (subtly) signed at the 51 and 19 interchange: https://www.google.com/maps/@43.1946114,-89.3262852,3a,15y,102.24h,89.47t/data=!3m6!1e1!3m4!1s8I9fiVaE39hM-uS7fgAohw!2e0!7i16384!8i8192
https://www.google.com/maps/@43.1946114,-89.3262852,3a,15y,102.24h,89.47t/data=!3m6!1e1!3m4!1s8I9fiVaE39hM-uS7fgAohw!2e0!7i16384!8i8192
I was trying to figure it out but gave up lol.
Quote from: Crown Victoria on December 04, 2021, 11:12:12 PM
Pennsylvania:
Interstate (and overall): I-476, 132.10 miles. Longest primary Interstate without an overlap is I-90 at 46.4 miles.
US Route: US 206, 0.46 miles. This is also the second shortest of any state, US, or Interstate route in PA, and the shortest one signed (PA 299 is the shortest, but unsigned).
State: PA 187, 43.13 miles
It was so difficult for me to think what PA route may be. I used to think that PA was the haven of short concurrencies until I started clinching a lot more roads in OH this year.
Quote from: TheHighwayMan394 on December 03, 2021, 11:55:23 AM
MN
I-: none
US: none
MN: MN 61 (149 miles)
Technically there's a concurrency with Cook County 17. :bigass:
And US 69 in MN doesn't have a concurrency.
Quote from: Molandfreak on December 05, 2021, 09:56:11 PM
Quote from: TheHighwayMan394 on December 03, 2021, 11:55:23 AM
MN
I-: none
US: none
MN: MN 61 (149 miles)
Technically there's a concurrency with Cook County 17. :bigass:
And US 69 in MN doesn't have a concurrency.
Neither does US 65, unless county highways count.
MS
US: US 90 (~80 miles)
I: I-110 (~5 miles, MS 15 was truncated from the concurrency recently) (I-269 is 26 miles if you don't count MS 304)
SR: Idk. But MS 53 is 38.9 miles and it doesn't have a concurrency.
Quote from: DandyDan on December 06, 2021, 04:37:52 AM
Quote from: Molandfreak on December 05, 2021, 09:56:11 PM
Quote from: TheHighwayMan394 on December 03, 2021, 11:55:23 AM
MN
I-: none
US: none
MN: MN 61 (149 miles)
Technically there's a concurrency with Cook County 17. :bigass:
And US 69 in MN doesn't have a concurrency.
Neither does US 65, unless county highways count.
65 is also duplexed with BL I-35 in Albert Lea, if that means anything.
Quote from: jeffandnicole on December 04, 2021, 05:27:37 PM
For New Jersey...
I believe the GSP wins in NJ, at 88 miles (around MP 84 to MP 172 at the NY State border).
If you wanna get technical with the wording "longest highway", the NJ Turnpike, as a highway, doesn't have a concurrency for 117 or so continuous miles, with its sole concurrency being from MP 0 to MP 0.9 with US 40. The remainder of the highway has two different route numbers, but they never overlap.
i believe the intent is full highways without a concurrency (as opposed to longest highway segments without).
based on that criteria, based on a quick scan of Wikipedia:
ACX - 44.19 mi
NJ 55 - 40.54 mi
I-195 - 34.17 mi
US 9W - 11.17 mi
Quote from: US 89 on December 05, 2021, 11:32:52 AM
Quote from: SectorZ on December 05, 2021, 09:08:40 AM
Quote from: jp the roadgeek on December 04, 2021, 09:46:24 AM
Quote from: bob7374 on December 03, 2021, 10:07:04 PM
Quote from: SectorZ on December 03, 2021, 09:11:49 AM
Massachusetts I believe would be I-90. MA 28 and US 20 are the only things longer and they have concurrencies with tons of things.
New Hampshire (and I had to look this up to confirm) is NH 175, just over 25 miles by itself. NH 110 is just behind it a half mile shorter.
For Mass., i-90 East has an unsigned concurrency with MA 1A from I-93 to its end in East Boston, but the first 133 miles are concurrency free. Then there's about 52 miles of I-95, excluding the 128 concurrency.
I thought MA 1A went through the Callahan/Sumner tunnels and would stay on 93/1/3 as a silent concurrency with its parent up to the junction. Otherwise, 495 would be the longest in MA.
You and I thought that because it does.
I thought there was something about 1A being rerouted to I-90 because the I-93 tunnel lacks some movements to/from the Sumner/Callahan tunnels that the old Central Artery had.
Executive Office of Transportation - Office of Transportation Planning Roads - June 2008: The older tunnels to and from East Boston have interchanges with I-93 and surface roads north of the point at which unsigned Route 1A "exits" Route 1 in downtown Boston. Unsigned Route 1A along the Fitzgerald Expressway does not directly connect to those tunnels; a direct connection requires using I-90 and the newer Ted Williams Tunnel,
which is not concurrent with Route 1A at any point.