What states have nonduplication rule for route numbers?

[hbelkins]

And about the section of NY 17/I-86 near Sayre, does it even show up in PennDOT route logs at all? I was under the impression that it was a NYSDOT designed, built, and maintained road that incidentally crossed the PA border for a very short distance.

Interesting question because there definitely aren't any "Entering Pennsylvania/New York" signs there, unless my observation skills are just really that bad and I somehow missed them. I'll actually be traveling that route again Sunday morning (07/17/2016) so I'll keep an eye out.

There are just small signs there.





More photos -- http://millenniumhwy.net/2009_Milford_PA_Day_2/index2.html

[GaryV]

I think the BL Routes had a lot more equity back in those days given the Interstates were a new shinny thing in the 1960s.  I would be fine with it so long as you could travel between Lansing and Detroit via Grand River on signed trunk lines.  It was always kind of fun to get off I-96 and just explore the older road when I was in high school, it was really the first time I had an opportunity to explore something like that...92 Sunbird and all. 

Maybe, but Grand River Avenue between Grand Rapids and the Lansing area hasn't been a trunkline since I-96 was built to the south of it, and the same goes for the section between Webberville and Farmington, other than the business loop at Howell. Once the new freeway was built, the old road was turned back to the local jurisdictions. The core purpose of the road had been usurped, and there wasn't any reason for the state to retain it in most places.

True...guess it goes back to the old signage for navigation argument rather than who maintains it.  I suppose it really doesn't matter really because if there was a problem on I-96 most of the locals knew Grand River was there to get around it.

And now that they have the "Emergency" orange signs for Interstates, it's probably signed for navigation again.  But not as M-16.  (I wonder if M16 is too much associated with the military rifle.)

[Max Rockatansky]

I think the BL Routes had a lot more equity back in those days given the Interstates were a new shinny thing in the 1960s.  I would be fine with it so long as you could travel between Lansing and Detroit via Grand River on signed trunk lines.  It was always kind of fun to get off I-96 and just explore the older road when I was in high school, it was really the first time I had an opportunity to explore something like that...92 Sunbird and all. 

Maybe, but Grand River Avenue between Grand Rapids and the Lansing area hasn't been a trunkline since I-96 was built to the south of it, and the same goes for the section between Webberville and Farmington, other than the business loop at Howell. Once the new freeway was built, the old road was turned back to the local jurisdictions. The core purpose of the road had been usurped, and there wasn't any reason for the state to retain it in most places.

True...guess it goes back to the old signage for navigation argument rather than who maintains it.  I suppose it really doesn't matter really because if there was a problem on I-96 most of the locals knew Grand River was there to get around it.

And now that they have the "Emergency" orange signs for Interstates, it's probably signed for navigation again.  But not as M-16.  (I wonder if M16 is too much associated with the military rifle.)

When did that happen?  I haven't lived there since the 1990s but I don't recall seeing any orange signage last year between Detroit and Lansing.  Yes...crossed my mind with M-16 but wouldn't kind of already exist with M-14 and M-1 having similar designation to military rifles?  I'm fairly certain the M14 is still even used in limited service capacity.

[7/8]

And about the section of NY 17/I-86 near Sayre, does it even show up in PennDOT route logs at all? I was under the impression that it was a NYSDOT designed, built, and maintained road that incidentally crossed the PA border for a very short distance.

Interesting question because there definitely aren't any "Entering Pennsylvania/New York" signs there, unless my observation skills are just really that bad and I somehow missed them. I'll actually be traveling that route again Sunday morning (07/17/2016) so I'll keep an eye out.

I drove there in April. They have signs that say "State Border", but they're certainly smaller and less noticeable than regular state border signs.

[CNGL-Leudimin]

I've seen Chinese expressway plans (which can be resumed in FritzOwling the entire country) and I observed the same phenomenon in several provinces, where a Sxx designation is skipped if the Gxx designation of the same number enters the province. However this is not eligible for this thread as it asks specifically for states, not provinces.

[GaryV]

I think the BL Routes had a lot more equity back in those days given the Interstates were a new shinny thing in the 1960s.  I would be fine with it so long as you could travel between Lansing and Detroit via Grand River on signed trunk lines.  It was always kind of fun to get off I-96 and just explore the older road when I was in high school, it was really the first time I had an opportunity to explore something like that...92 Sunbird and all. 

Maybe, but Grand River Avenue between Grand Rapids and the Lansing area hasn't been a trunkline since I-96 was built to the south of it, and the same goes for the section between Webberville and Farmington, other than the business loop at Howell. Once the new freeway was built, the old road was turned back to the local jurisdictions. The core purpose of the road had been usurped, and there wasn't any reason for the state to retain it in most places.

True...guess it goes back to the old signage for navigation argument rather than who maintains it.  I suppose it really doesn't matter really because if there was a problem on I-96 most of the locals knew Grand River was there to get around it.

And now that they have the "Emergency" orange signs for Interstates, it's probably signed for navigation again.  But not as M-16.  (I wonder if M16 is too much associated with the military rifle.)

When did that happen?  I haven't lived there since the 1990s but I don't recall seeing any orange signage last year between Detroit and Lansing.  Yes...crossed my mind with M-16 but wouldn't kind of already exist with M-14 and M-1 having similar designation to military rifles?  I'm fairly certain the M14 is still even used in limited service capacity.

"Emergency" routes went up in Metro Detroit about 2 or 3 years ago.  I've seen them along I-94 further west.  I was in Grand Rapids / Walker area this spring, and I'm trying to remember if there was an Emergency I-96 there at that time.  I'm thinking so, but don't remember for sure.

I haven't been on Grand River Ave for a long time, so I can't say if it is posted as Emergency or not, but it would be a good guess.

[Max Rockatansky]

I think the BL Routes had a lot more equity back in those days given the Interstates were a new shinny thing in the 1960s.  I would be fine with it so long as you could travel between Lansing and Detroit via Grand River on signed trunk lines.  It was always kind of fun to get off I-96 and just explore the older road when I was in high school, it was really the first time I had an opportunity to explore something like that...92 Sunbird and all. 

Maybe, but Grand River Avenue between Grand Rapids and the Lansing area hasn't been a trunkline since I-96 was built to the south of it, and the same goes for the section between Webberville and Farmington, other than the business loop at Howell. Once the new freeway was built, the old road was turned back to the local jurisdictions. The core purpose of the road had been usurped, and there wasn't any reason for the state to retain it in most places.

True...guess it goes back to the old signage for navigation argument rather than who maintains it.  I suppose it really doesn't matter really because if there was a problem on I-96 most of the locals knew Grand River was there to get around it.

And now that they have the "Emergency" orange signs for Interstates, it's probably signed for navigation again.  But not as M-16.  (I wonder if M16 is too much associated with the military rifle.)

When did that happen?  I haven't lived there since the 1990s but I don't recall seeing any orange signage last year between Detroit and Lansing.  Yes...crossed my mind with M-16 but wouldn't kind of already exist with M-14 and M-1 having similar designation to military rifles?  I'm fairly certain the M14 is still even used in limited service capacity.

"Emergency" routes went up in Metro Detroit about 2 or 3 years ago.  I've seen them along I-94 further west.  I was in Grand Rapids / Walker area this spring, and I'm trying to remember if there was an Emergency I-96 there at that time.  I'm thinking so, but don't remember for sure.

I haven't been on Grand River Ave for a long time, so I can't say if it is posted as Emergency or not, but it would be a good guess.

I'll have to check that out next year when head out that way.  It might be fun to check out Grand River in full from Lansing to Brighton since I'm planning visiting family in both cities.

[The High Plains Traveler]

Colorado can be complicated. Routes are defined on the state route log by segment (nnnA). There is no duplication of routes on a single highway segment; it's designated by route class (Interstate>U.S.>State), and then by the lower of the duplicated numbers. U.S. 50 is listed by Route 050A west of Pueblo, then because it is concurrent with I-25 for a short stretch, Route 050B extends east of Pueblo to Kansas. Likewise, Route 6 is not continuous across the state because its segments (006A, 006B, etc.) are connected by I-70, I-25, and I-76. There is a CO-36 that runs parallel to I-70 east of Denver because U.S. 36 is technically carried with I-70. Same with CO-40 further east. But, they're all segments of Route 36 or 40. In other words, there wouldn't be a CO-25 somewhere not connected somehow with I-25.

New Mexico definitely has no duplications. there is a NM-412, but U.S. 412 is not a route designated independently of U.S. 56 and so does not technically exist in the state system, where like Colorado each piece of highway has a single designation. New Mexico does acknowledge in its route logs where U.S. routes duplicate, listing where Interstates or Interstate Business Routes are "dominant" in a segment, and the U.S. route is "subordinate".

[apeman33]

Kansas prefers not to duplicate numbers although I don't know if this an actual rule or law. The only duplicate number is 177, with K-177 being a very long route and U.S. 177 existing for just a few miles after crossing the Oklahoma State Line.

When I-35 came into existence, K-35 was renumbered to K-135. Then when I-35W was changed to I-135, K-135 became K-152.

There once was a K-70 but I don't know if it was renumbered or decommissioned because of I-70.

[Fred Defender]

I suppose Florida "technically" doesn't do route duplication.  I say "technically" since all US and Interstate Highways all have a secret state designation. So while there is a FL 17 and U.S. 17 for example the latter is legislatively know by a Florida State Road number.  In this case FL 5, 35, 555 and 600 if memory serves correct.

There are State Roads 4, 10, 75, 95, 295, 375, and 595 for each Interstate of the same number, but only FL 10 is somewhat close to I-10. So there are "secret" numbers for each, but they were typically first, since many US Routes did not extend into Florida until after the post-WWII state-wide renumbering. In many cases, the SR continues after the US Route moves away onto another road alignment.

There's US 17 near FL 17, with deprecated sections labelled CR 17 (or even 17A/17B) which is probably rather confusing. US 17 is hidden FL 35 in many places, hidden FL 15 in others.

There might be some decommissioned secondary routes (795, for example) or roads like FL 1 or FL 27 which were renamed to prevent confusion.

So, I'd say that Florida only prevents number duplication if it's locally confusing. FL 27 became FL 9336* because it was close to US 27. Not sure if FL 1 / US 90 was changed to FL 10 (although FL 90 and FL 10 are used as hidden designations for US 41's "east-west" section [former US 94]).

* I've always wanted an answer to why this number was chosen, with many others available.

I didn't see anyone mention routes nineteen (19) and forty-one (41) in Florida. Although SR41 was never a major artery and was downgraded to county maintenance long ago, it ran in very close proximity to US41. SR/US19 is a different story. SR19, although it lies a good distance east of US19 is much more heavily-traveled than SR/CR41. But it is very confusing, especially since Florida does not mark its US routes with the corresponding state route numbers.

[Max Rockatansky]

I suppose Florida "technically" doesn't do route duplication.  I say "technically" since all US and Interstate Highways all have a secret state designation. So while there is a FL 17 and U.S. 17 for example the latter is legislatively know by a Florida State Road number.  In this case FL 5, 35, 555 and 600 if memory serves correct.

There are State Roads 4, 10, 75, 95, 295, 375, and 595 for each Interstate of the same number, but only FL 10 is somewhat close to I-10. So there are "secret" numbers for each, but they were typically first, since many US Routes did not extend into Florida until after the post-WWII state-wide renumbering. In many cases, the SR continues after the US Route moves away onto another road alignment.

There's US 17 near FL 17, with deprecated sections labelled CR 17 (or even 17A/17B) which is probably rather confusing. US 17 is hidden FL 35 in many places, hidden FL 15 in others.

There might be some decommissioned secondary routes (795, for example) or roads like FL 1 or FL 27 which were renamed to prevent confusion.

So, I'd say that Florida only prevents number duplication if it's locally confusing. FL 27 became FL 9336* because it was close to US 27. Not sure if FL 1 / US 90 was changed to FL 10 (although FL 90 and FL 10 are used as hidden designations for US 41's "east-west" section [former US 94]).

* I've always wanted an answer to why this number was chosen, with many others available.

I didn't see anyone mention routes nineteen (19) and forty-one (41) in Florida. Although SR41 was never a major artery and was downgraded to county maintenance long ago, it ran in very close proximity to US41. SR/US19 is a different story. SR19, although it lies a good distance east of US19 is much more heavily-traveled than SR/CR41. But it is very confusing, especially since Florida does not mark its US routes with the corresponding state route numbers.

Some of them actually do on the eastern side of Lake Okeechobee, Martin County comes to mind with the US/FL Route co-signage actually being displayed.  When I first moved YEARS ago to Florida I was actually looking for some sort of connection for Old FL 41 which was CR 541 in Hernando and CR 41 in Pasco County which is actually led me to discover the hidden grid around the state.  If memory serves US 41 (which is a very short distance west of old FL 41 in Hernadno/Pasco County) is FL 45 to Naples and of course FL 90 from Naples to Miami.  FL 19 is mostly known for running Ocala National Forest and never really gets anywhere close to US 19 which is westward near the coast line.  The even stranger thing is that there are still state route level FL 41 and 39 that multiplex US 301 south of Dade City.