How many states have "Secret" Routes?

[CapeCodder]

Thanks to Kurumi I have learned about CT's secret routes. How many other states have these secret routes?

[Max Rockatansky]

What's your definition of a secret route?  I would imagine the X Routes in Arizona or the weird 900 series in Utah would be what you're after. 

[CapeCodder]

What's your definition of a secret route?  I would imagine the X Routes in Arizona or the weird 900 series in Utah would be what you're after.

Unsigned Routes

[hbelkins]

A number of Kentucky's state routes are unsigned, particularly four-digit routes within city limits that are cataloged as supplemental routes.

West Virginia has a handful of unsigned primary routes, such as Alt. WV 72.

[CtrlAltDel]

All Interstates and US routes in Georgia have a hidden state designation, if that counts. I-75, for example, is also GA-401.

Also, there's something weird going on with I-10 in Los Angeles. I couldn't tell for sure what it is, though.

[Mapmikey]

All Interstates and US routes in Georgia have a hidden state designation, if that counts. I-75, for example, is also GA-401.

Almost. There is a segment of Signed US 25 Bus in Augusta that does not have an underlying state highway.

The reason for this is when GA 28 was moved onto its expressway they removed a small segment of US 25 Bus from the state highway system.

[Max Rockatansky]

All Interstates and US routes in Georgia have a hidden state designation, if that counts. I-75, for example, is also GA-401.

Also, there's something weird going on with I-10 in Los Angeles. I couldn't tell for sure what it is, though.

I-10 has an unsigned spur which connects to US 101.  It was once part of US 60/70/99 and was briefly I-105. 

[oscar]

What's your definition of a secret route?  I would imagine the X Routes in Arizona or the weird 900 series in Utah would be what you're after.

Unsigned Routes

That's too broad, IMO. Many states have routes that are unsigned for one reason or another, but not because the DOT is trying to conceal their existence. Alaska has one route that the DOT tried to sign, but the signs kept disappearing due to intense local hostility to the route designation, and the DOT gave up on the signage. But the route still appears on the state highway map and other official maps.

US 666 had a massive sign theft problem before it was renumbered as US 491, but I'm not sure it was ever completely unsigned. Especially at its north end, where Utah DOT went to some trouble to make the 666 marker there hard to steal.

[NWI_Irish96]

The very short section of Keystone Pkwy between I-465 and 96th St is unsigned IN 431.

[cwf1701]

Michigan has a number of unsigned connectors such as Exit 51 B (the Fisher Freeway stub to Gratiot for example) and a few unsigned highways (such as old M-14 and old M-21 not yet turned over to local control).

[CtrlAltDel]

All Interstates and US routes in Georgia have a hidden state designation, if that counts. I-75, for example, is also GA-401.

Almost. There is a segment of Signed US 25 Bus in Augusta that does not have an underlying state highway.

The reason for this is when GA 28 was moved onto its expressway they removed a small segment of US 25 Bus from the state highway system.

I stand corrected.

All Interstates and US routes in Georgia have a hidden state designation, if that counts. I-75, for example, is also GA-401.

Also, there's something weird going on with I-10 in Los Angeles. I couldn't tell for sure what it is, though.

I-10 has an unsigned spur which connects to US 101.  It was once part of US 60/70/99 and was briefly I-105.

Is this it?

[Max Rockatansky]

^^^

Yes, you have it. 

[CapeCodder]

What's your definition of a secret route?  I would imagine the X Routes in Arizona or the weird 900 series in Utah would be what you're after.

Unsigned Routes

That's too broad, IMO. Many states have routes that are unsigned for one reason or another, but not because the DOT is trying to conceal their existence. Alaska has one route that the DOT tried to sign, but the signs kept disappearing due to intense local hostility to the route designation, and the DOT gave up on the signage. But the route still appears on the state highway map and other official maps.

US 666 had a massive sign theft problem before it was renumbered as US 491, but I'm not sure it was ever completely unsigned. Especially at its north end, where Utah DOT went to some trouble to make the 666 marker there hard to steal.

You're right; it is too broad. I basically mean if any other state has a system like CT's. I just suck at wording things.

[hotdogPi]

NY's 900-series routes, except for the few goofs where they do get signed.

[michravera]

Thanks to Kurumi I have learned about CT's secret routes. How many other states have these secret routes?

California has I-305 and CASR-51 that are both signed as something else (US-50 and Bus-80, respectively). Are those secret?

[ozarkman417]

Oklahoma has the unsigned I-444, and I think Alabama internally designates US and/or interstate highways as state routes.

[roadman65]

Florida has a bunch of them including its turnpike designated as SR 91.

[Revive 755]

Illinois has a number of these.  Outside of the Chicago District of IDOT they are occasionally given reference markers.  Inside the Chicago District of IDOT there are number of unmarked routes where they only way to tell whose road it is is by official maps.

Iowa may still have a few, though the purge back in 2003 wiped out a number of them.

If outer roads are excluded, Missouri generally does not have secret routes - at the least the road will get posted with one or two letters.

[Dirt Roads]

West Virginia has a handful of unsigned primary routes, such as Alt. WV 72.

Additionally, West Virginia also has some unsigned state routes, albeit still functioning as secondary routes:

WV-372 (East Lynn to Branchland)
WV-401 (West Liberty to I-40 near Valley Grove)
WV-471 (Cairo to Cisco)
WV-473 (Glenville to Burnt House)
WV-507 (Former Alt US-22 in Weirton), marked as CR-507
WV-701 (Pine Grove to Wileyville)
WV-703 (Wadestown to Rivesville), with a notation that these segments were never signed
WV-707 (portion north of WV-279 FBI Drive in Clarksburg), formerly all of FBI Drive was signed as CR-707
WV-922 (Reedsville to US-119 near Halleck)

There are also some existing roads that have assigned future state route numbers, where in many cases the roads have not yet been upgraded.  In a few cases, the route is not connected all the way through to the destinations.  None of these are in the same category as "secret" state routes overlaid on US highways (and/or Interstate highways) in Georgia and Florida.

[J3ebrules]

NJ has three I'm aware of: the NJ Turnpike south of where I-95 joins up (unsigned route 700),
The Garden State Parkway (unsigned route 444), and the Atlantic City Expressway (unsigned route 446).

[wanderer2575]

What's your definition of a secret route?  I would imagine the X Routes in Arizona or the weird 900 series in Utah would be what you're after.

My definition is that an actual route number is assigned but for whatever reason said route number is not shown on maps or signed in the field.  A few Michigan examples are I-296 in Grand Rapids, M-554 in Marquette, and M-331 in Kalamazoo (the last two before they were decommissioned and the roads turned back over to the cities). 

As opposed to other routes under MDOT jurisdiction that have some internal designation (usually "Old M-xx" or "Old US-xx") but not an actual route number, such as Grand River Avenue in Farmington Hills and Farmington (Old BL I-96), Old US-223 in Monroe County, and the I-696 service drives in Macomb County (Old M-6).

[formulanone]

...Alabama internally designates US and/or interstate highways as state routes.

AL 1 - US 431
AL 2 - US 72
AL 3 - US 31
AL 4 - US 78 (though sometimes appears alongside of it)
AL 6 - US 82
AL 7 - US 11
AL 8 - US 80
AL 12 - US 84
AL 15 - US 29
AL 16 - US 90
AL 38 - US 280
AL 42 - US 98

There's a few numbers which usually become invisible when they become concurrent with another US Route: 13, 17, 53, 74 which have independently-signed sections.

There's also 300, a short connector route in Fosters which nobody has yet seen in the field.

[Mr. Matté]

NJ has three I'm aware of: the NJ Turnpike south of where I-95 joins up (unsigned route 700),
The Garden State Parkway (unsigned route 444), and the Atlantic City Expressway (unsigned route 446).

And there would have been even more had it not been for those meddlin' traffic signal blades (59, 64) and enhanced mileposts (13, 167)!

[Max Rockatansky]

There is the unsigned/un-Postmiled state highways in California like; CA 275 and CA 283.  That said it doesn't take much digging to find the route definitions so I wouldn't exactly call them secret.   The rogue highways are a little more interesting since those are local agencies signing State Highways on non-State maintained roads. 

https://www.aaroads.com/forum/index.php?topic=27149.msg2512665#msg2512665

[hotdogPi]

This thread is about secret route systems.