How many states have "Secret" Routes?

[froggie]

Minnesota's 800- and 900-series routes would qualify.  Both series are unsigned, with the former usually referring to small connectors and extensions through interchanges (since Minnesota, like many states, defines routes and route intersections via centerline), while the latter are usually former signed routes that are turnback candidates but to which MnDOT has not finalized agreement with the receiving jurisdiction.

Mississippi's 700-, 800-, and 900-series routes used to qualify, but many of them are signed now.

Vermont's Named State Highways might qualify...these are routes that have an internal number, but are officially named instead of numbered.

[D-Dey65]

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

I'd could say that I wish NY 100B was secretly signed between NY 119 and the west end of the NY 100 overlap, but I'd actually like to see it signed openly.

I've heard people say that the NY 24 gap is actually a remaining secret route between NY 110 and Exit 71 on I-495. I'm debating how I feel about the idea of that being true.

[Eth]

I would say that Georgia's 400-series (excluding 400 and 410) would qualify, but it's hard to really call them truly "secret" when most of them appear clearly on Google Maps.

However, GDOT's Road Inventory data (available from here) does include two "secret" route numbers: 920 and 1008.

920 is a nearly 17-mile long route in Fayette, Clayton, and Henry counties, passing through the cities of Lovejoy and McDonough. It's mostly a 2-lane road, but about 3.5 miles of it in Henry is 4 lanes. (I'm reasonably sure this is Jonesboro Road, which intersects I-75 at exit 221.)

1008 is about 18 miles long. It has no county specified in the table, oddly, but the first half-mile is claimed to be in the city of East Dublin, where US 80 and US 319 meet a bit north of I-16. It also claims to have 0 lanes for its whole length, so I presume it is not actually constructed.

[epzik8]

In Maryland, every road open to the public has a route number. There are dozens of suffixed state
routes that are frequently leftovers in the state system after reconstruction or realignment that
remain under state maintenance for no especially good reason and are almost never signed.

But roads maintained by the counties and by the municipalities all have "secret" route numbers that
are never put on a sign.  This also applies to the federal parkways - the Baltimore-Washington Parkway
has a "secret" state route number (MD-295), the other NPS motor roads (Suitland Parkway and Clara
Barton Parkway and the roads in National Park Service properties like Catoctin Mountain Park and
Assateague Island National Seashore have "secret" federal government route numbers that are
similarly never signed.

I thought MD 295 stopped at MD 175 when maintenance changes from the State Highway Administration to the National Park Service.

[SectorZ]

Maine has a "system" if you count two routes as a system.

The Scarborough Connector (701) is signed on Google Maps. No signs for it on roadway except for mile markers denoting the route number.

The Maine Tpke Approach (703) is not signed on Google Maps. Same deal of no roadway signs except for the mile markers.

Example for 703, https://goo.gl/maps/SYEaZGiHVSeQAcT78

Conveniently they intersect as well.

[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).

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

What about the Palisades Parkway?

Unsigned 445 in Jersey, Unsigned 987C in NY. Am I missing any others? Can't believe I forgot that one, especially since I'm going there in two weeks.

[WillWeaverRVA]

Some state-maintained routes in Virginia that serve state universities, parks, or institutions are intentionally not signed by VDOT, as the designation does not provide any meaningful navigational aid. In this sense those routes could be considered "secret."

Many of the interstates in Virginia used to have secret state route numbers. For example, I-495 was also designated VA 413, but VA 413 was only referenced in CTB minutes (but as late as the 2000s).

[sbeaver44]

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)!

What about the Palisades Parkway?

Unsigned 445 in Jersey, Unsigned 987C in NY. Am I missing any others? Can't believe I forgot that one, especially since I'm going there in two weeks.

446X for the Atlantic City-Brigantine Conn

I forget – is NJ 187 actually signed?  It's pretty short.

[WillWeaverRVA]

446X for the Atlantic City-Brigantine Conn

I forget – is NJ 187 actually signed?  It's pretty short.

It is.

[MikieTimT]

Fulbright Expressway in Fayetteville, AR would likely qualify.  Used to be US-71 and bypassed Fayetteville, but when US-71 moved onto what became I-540/I-49, the northern and southern connectors that looped back to the old route lost their route numbers.  May be something deep in ARDOT's archives about an internal route number, but certainly nothing that's signed.

[WillWeaverRVA]

In Maryland, every road open to the public has a route number. There are dozens of suffixed state
routes that are frequently leftovers in the state system after reconstruction or realignment that
remain under state maintenance for no especially good reason and are almost never signed.

But roads maintained by the counties and by the municipalities all have "secret" route numbers that
are never put on a sign.  This also applies to the federal parkways - the Baltimore-Washington Parkway
has a "secret" state route number (MD-295), the other NPS motor roads (Suitland Parkway and Clara
Barton Parkway and the roads in National Park Service properties like Catoctin Mountain Park and
Assateague Island National Seashore have "secret" federal government route numbers that are
similarly never signed.

I thought MD 295 stopped at MD 175 when maintenance changes from the State Highway Administration to the National Park Service.

The NPS maintained portion of the Baltimore-Washington Parkway carries the MD 295 designation internally. (The segment of MD 295 in Baltimore which includes Russell Street and other surface streets maintained by the city is also internally designated MD 295.)

[TheGrassGuy]

No one's mentioned NY's reference routes?! 

[hotdogPi]

No one's mentioned NY's reference routes?! 

Reply #13 (which is mine)