Which states allow number duplication?

Started by hotdogPi, April 16, 2018, 09:39:36 AM

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hotdogPi

There are a lot of mentions of states allowing or not allowing number duplication, but there doesn't seem to be a reference list all in one place.

I'll start:

Maine: I-195 and ME 195 is the only example with nonsuffixed routes. There are some suffixed examples like US 1A and ME 4A.
New Hampshire: US 4 and NH 4, as well as some suffixed routes.
Massachusetts: I-295 and MA 295 is the only example; US 3 and MA 3 is arguable (it's a single corridor). Suffixed routes are assumed to have a hidden overlap; they are not separate routes.
Rhode Island: No duplication.
Connecticut: No duplication.
Vermont: No duplication.
New York: Interstates and state routes can be duplicated. US routes and state routes cannot, except for 2, 15, and former 220, for all of which the US route is very short in New York.
California: No duplication, but an Interstate and a state route can have the same number if they are part of the same corridor.
Arkansas: Duplication allowed with no restrictions. Two state routes can have the same number; this is a common occurrence.
Georgia: State routes can duplicate both Interstates and US routes.
Clinched, minus I-93 (I'm missing a few miles and my file is incorrect)

Traveled, plus US 13, 44, and 50, and several state routes

I will be in Burlington VT for the eclipse.


jeffandnicole

NJ has I-676 and CR 676, but no Interstate/US/State dups.

WillWeaverRVA

#2
Virginia does not typically allow duplication, although there are two three exceptions:

- VA 13 came into existence after US 13 was already around...in fact, there was already another VA 13 at the time (it was a state route extension of US 13, which did not yet exist on the mainland).

- VA 360 and US 360. VA 360 is an old alignment of US 360.

- US 33 and VA 33; VA 33 is a state route extension of US 33.

North Carolina does not typically allow duplication except in cases where a state route number is assigned to a future interstate corridor (NC 140/I-140, NC 295/I-295, etc).
Will Weaver
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"But how will the oxen know where to drown if we renumber the Oregon Trail?" - NE2

SP Cook

West Virginia has only one duplicate number, there is a WV 68 and I-68.  The former US 48 was "promoted" to I-68 and there was no reason to renumber because they are about as far apart as possible.

There is a sign on I-70 in Maryland that reads "this is MD 68 - For I-68 Stay on I-70", which is confusing.   

NWI_Irish96

Indiana allowed duplication between State routes 64, 65, 69, 70 and their interstate counterparts.  I-64 and IN 64 actually intersect each other.  Indiana does not allow duplication between State routes and US routes.  The most notable example is when US 35 was commissioned in Indiana, the existing IN 35 was changed to IN 135.  The only exception was US 131 and IN 131, which were both very short and at opposite ends of the state, so no real confusion was possible.  IN 131 is gone now anyway. 
Indiana: counties 100%, highways 100%
Illinois: counties 100%, highways 61%
Michigan: counties 100%, highways 56%
Wisconsin: counties 86%, highways 23%

hockeyjohn

Indiana has Interstate and State Road duplications (64, 65, 69 and 70), but not US Highway and State Road.

Michigan has some US Highway and State Road duplications (8, 10, 24, and 45).

LM117

#6
Quote from: WillWeaverRVA on April 16, 2018, 09:49:35 AMNorth Carolina does not typically allow duplication except in cases where a state route number is assigned to a future interstate corridor (NC 140/I-140, NC 295/I-295, etc).

Two current NC duplicates that aren't future interstates are NC-73/I-73 and NC-87/I-87. There will also be NC-42/I-42 whenever I-42 shields go up, though NCDOT originally wanted I-36 but that was rejected by AASHTO since it violated the numbering grid and changed it to I-42. NCDOT was forced to eat that one.
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hbelkins

Kentucky does not, with two exceptions (three if you count a West Virginia incursion into the Bluegrass State.)

KY 79 and US 79. The two routes do not intersect, and to my knowledge never did intersect, but KY 79 could be construed to be an extension of US 79 northeastward out of Russellville.

KY 69 and I-69. This came about by the addition of I-69 southwest of Indianapolis. The two routes are in the same general area of Kentucky, but do not intersect and there should be no confusion issues.

The West Virginia incursion involves US 52. When the new portion of Corridor G was built between Williamson and the US 52/119 split, it was deemed easier and cheaper to have the route cross into Kentucky twice, rather than follow the Tug Fork of the Big Sandy River on the WV side. The route is owned and maintained by West Virginia, so technically there is no US 52 in Kentucky to conflict with KY 52. If Kentucky ever did take ownership of the route, it would be easy to avoid duplication if necessary by calling it US 119.

Tennessee has all sorts of duplication. State routes can duplicate both interstates and US routes.


Government would be tolerable if not for politicians and bureaucrats.

WillWeaverRVA

Quote from: LM117 on April 16, 2018, 11:09:28 AM
Quote from: WillWeaverRVA on April 16, 2018, 09:49:35 AMNorth Carolina does not typically allow duplication except in cases where a state route number is assigned to a future interstate corridor (NC 140/I-140, NC 295/I-295, etc).

Two current NC duplicates that aren't future interstates are NC-73/I-73 and NC-87/I-87. There will also be NC-42/I-42 whenever I-42 shields go up, though NCDOT originally wanted I-36 but that was rejected by AASHTO since it violated the numbering grid and changed it to I-42. NCDOT was forced to eat that one.

I forgot about I-42/NC 42...and I don't even want to think about I-87. ;)
Will Weaver
WillWeaverRVA Photography | Twitter

"But how will the oxen know where to drown if we renumber the Oregon Trail?" - NE2

adventurernumber1

Tennessee must be one of the states that allows number duplication, because there is at least both a US 27 and a TN SR 27. Heck, US 27 and TN 27 even both go through the Chattanooga area! See here:


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Doctor Whom

Quote from: SP Cook on April 16, 2018, 09:51:44 AMThere is a sign on I-70 in Maryland that reads "this is MD 68 - For I-68 Stay on I-70", which is confusing.
Maryland has several Interstate/state duplicates, although except for that example, they are either in the same corridor (like I-295 and Md. 295) or far enough apart that there is little likelihood of confusion (like I-97 and Md. 97).

jemacedo9

PA has:
PA 99 and I-99: PA 99 is internally numbered as SR 0399
PA 86 and I-86: PA 86 is internally numbered as SR 0886
PA 380 and I-380: PA 380 is internally numbered as SR 0400
PA 283 and I-283: PA 283 is somewhat of an extension of sorts of I-283 and is internally numbered as SR 0300

There are two separate PA 97s.  The southern PA 97 was once US 140, but when that was decommissioned it was numbered to match MD 97.  Both are internally numbered as SR 0097
There are two separate PA 29s.  I believe they used to connect along PA 309. Both are internally numbered as SR 0029
There are also the separate US 422s with an implied connection via US 22 and US 322.

Soon, there will be a PA 295 and an I-295.


ftballfan

Quote from: hockeyjohn on April 16, 2018, 10:15:12 AM
Michigan has some US Highway and State Road duplications (8, 10, 24, and 45).
All their 2di's are also used for state highways (69, 75, 94, 96). However, M-16 has yet to be reused despite US-16 being decommissioned in the state over 50 years ago

Flint1979

Michigan has
US-8 and M-8
US-10 and M-10
US-24 and M-24
US-45 and M-45
I-69 and M-69
I-75 and M-75
I-94 and M-94
I-96 and M-96

wxfree

#14
Texas allows duplication of numbers.  A list of examples would be extensive.  Here's a list of road types across which a number could be duplicated.  Types separated by commas may use duplicates, while types separated by slashes share a pool of numbers.  Alternate and business routes are not listed.

Interstates, US highways, state highways, loops/spurs, farm/ranch to market/urban roads, park roads, recreation roads, and ranch roads.  There's only one Ranch Road (1), but the system has its own number pool and uses a duplicate of a farm to market road number.  There's also the principle arterial state system which provides state aid for certain city streets that are not designated state highways but are described as being part of the state highway system.

The most used number may be 10, which is used for an Interstate, a state highway, a farm to market road, a spur, a park road, and a recreation road (6 of the 8 categories, excluding PASS roads).
I'd like to buy a vowel, Alex.  What is E?

Mapmikey

Quote from: WillWeaverRVA on April 16, 2018, 09:49:35 AM
Virginia does not typically allow duplication, although there are two three exceptions:

- VA 13 came into existence after US 13 was already around...in fact, there was already another VA 13 at the time (it was a state route extension of US 13, which did not yet exist on the mainland).

- VA 360 and US 360. VA 360 is an old alignment of US 360.

- US 33 and VA 33; VA 33 is a state route extension of US 33.

North Carolina does not typically allow duplication except in cases where a state route number is assigned to a future interstate corridor (NC 140/I-140, NC 295/I-295, etc).

Make it six:  I-381/VA 381; US 211/VA 211; US 311 and VA 311.  The CTB in theory was going to discuss renumbering VA 311 when US 311 came back but the issue just kinda went away.

Virginia has had several more US-VA duplications of one turning into the other (or very close):

US 17-VA 17
US 29-VA 29 (was just like the US 360/VA 360 setup of today)
US 121-VA 121
US 158-VA 158
US 258-VA 258
US 301-VA 301
US 311-VA 311
US 340-VA 340
US 501-VA 501

South Carolina allows duplication of interstate and state route numbers...

odditude

#16
Delaware:

  • DE 9 / US 9
  • DE 202 / US 202 (an interesting case, as DE 202 continues SB on Concord Pike where US 202 joins I-95 in the Wilmington area)
Quote from: jeffandnicole on April 16, 2018, 09:47:58 AM
NJ has I-676 and CR 676, but no Interstate/US/State dups.

NJ has many duplicates among 600-series county routes, which only prohibit duplication within county limits. While in some cases, there are numbers continued across county lines, this is more the exception than the rule.

There are no duplicates in the 500-series county routes.

pianocello

AFAIK, Iowa doesn't prohibit it, but there's only case where duplication exists: IA 136 and US 136. It helps that US 136 just clips the southern tip.

Illinois allows it; it even provides the first (?) example of an Interstate and US highway sharing a number within the same state (24). There were a few state routes that changed numbers due to intersecting new Interstate highways with the same number, most notably IL 80 (now 84) and IL 88 (now 40).
Davenport, IA -> Valparaiso, IN -> Ames, IA -> Orlando, FL -> Gainesville, FL -> Evansville, IN

TheHighwayMan3561

Minnesota does in limited cases:
-Two MN 62s - the original MN 62 is a rural two-lane road. The more well-known MN 62 in the Twin Cities came to be in 1988 when MnDOT took control of Hennepin County's Crosstown Expressway, County Road 62.
-US 61 and MN 61 (MN 61 replaced part of a decommissioned section of US 61)
-US 169 and MN 169 (MN 169 is a state "extension" of MN 169, separated by a few miles of US 53)
-US 65 and MN 65 (same as 169, though in this case the two directly intersected in downtown Minneapolis before US 65 was eliminated north of Albert Lea)
self-certified as the dumbest person on this board for 5 years running

cl94

14 Interstates and 2 US routes in New York are duplicated. An exhaustive list of existing cases:

- US/NY 2
- US/NY 15 (NY 15 was once entirely US 15)
- I-/NY 81
- I-/NY 86
- I-/NY 88
- I-/NY 90 (these actually cross)
- I-/NY 190
- I-/NY 290
- I-/NY 295
- I-/NY 787 (while related, NY 787 is NOT an extension of I-87)

There are also a handful of cases where a state route is a non-Interstate extension of an Interstate:

- NY 390
- NY 481
- NY 495
- NY 590
- NY 690
- NY 890

- The only NY route whose number was changed as a result of a new Interstate was NY 84, which is now NY 284.
- NY 87 was a former duplication, but it was renumbered when NY 812 was extended to provide a continuous route from NY 12 to the Canadian border in Ogdensburg.
- NY 220 duplicated US 220 until US 220 was truncated to I-86/NY 17 in Pennsylvania
- NY 99 was decommissioned 20 years before I-99 entered New York.
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MNHighwayMan

Quote from: TheHighwayMan394 on April 16, 2018, 02:19:11 PM
Minnesota does in limited cases:
-Two MN 62s - the original MN 62 is a rural two-lane road. The more well-known MN 62 in the Twin Cities came to be in 1988 when MnDOT took control of Hennepin County's Crosstown Expressway, County Road 62.
-US 61 and MN 61 (MN 61 replaced part of a decommissioned section of US 61)
-US 169 and MN 169 (MN 169 is a state "extension" of MN 169, separated by a few miles of US 53)
-US 65 and MN 65 (same as 169, though in this case the two directly intersected in downtown Minneapolis before US 65 was eliminated north of Albert Lea)

And in the same vein as the last two, there are also the former instances of MN-212 and 218. The former later became an extension of MN-5 and 36 and the latter largely became part of MN-25.

hbelkins

Quote from: Mapmikey on April 16, 2018, 01:18:16 PM
US 121-VA 121

The current VA 121 doesn't have anything to do with a former routing of any US 121, does it? The current VA 121 ends at Max Meadows and could probably work just as easily as a 6xx series secondary route.

Of course if the Coalfields Expressway is ever built, there will be a duplication since it's going to be numbered US 121.


Government would be tolerable if not for politicians and bureaucrats.

TheHighwayMan3561

Quote from: MNHighwayMan on April 16, 2018, 03:57:52 PM
Quote from: TheHighwayMan394 on April 16, 2018, 02:19:11 PM
Minnesota does in limited cases:
-Two MN 62s - the original MN 62 is a rural two-lane road. The more well-known MN 62 in the Twin Cities came to be in 1988 when MnDOT took control of Hennepin County's Crosstown Expressway, County Road 62.
-US 61 and MN 61 (MN 61 replaced part of a decommissioned section of US 61)
-US 169 and MN 169 (MN 169 is a state "extension" of MN 169, separated by a few miles of US 53)
-US 65 and MN 65 (same as 169, though in this case the two directly intersected in downtown Minneapolis before US 65 was eliminated north of Albert Lea)

And in the same vein as the last two, there are also the former instances of MN-212 and 218. The former later became an extension of MN-5 and 36 and the latter largely became part of MN-25.

On the other side of the coin, MN 35, MN 90, and MN 94 were all renumbered (each had their numbers increased by 100; MN 190 has been decommissioned while the other two live on). So I guess to follow the OP's criteria, maybe US/state duplicates are allowed but state/interstate ones are not.
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Max Rockatansky

Arizona has a bunch with the likes of; US 89, US 89A, AZ 89, AZ 89A, US 95, and AZ 95. 

Big John

Wisconsin generally does not allow duplication, but 2 relatively recent exemptions were made:  WI 39 was allowed to remain when I-39 was extended into Wisconsin, and WI 794 was created as an extension of I-794.



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