Interstate Service Roads

[SD Mapman]

So I was browsing the web, and I found this. Apparently, WyDOT maintains random stretches of interstate service roads as... unsigned service roads. Do any other states do this, or is Wyoming just odd?
(The interesting stuff in that pdf starts about page 29, by the way)

[vdeane]

New York has a complex system of assigning reference markers to service roads.  They get the route number of the road they service, and the rest I don't know off the top of my head.

[Mapmikey]

In Virginia, service roads that are along interstates or other primary routes can be maintained by the state.

Most are posted (F-routes).  Although they are built and maintained in a wide range of standards (e.g. anywhere from a gravel driveway to a multilane boulevard), all are considered to be part of the Primary system in Virginia.  Service roads along any secondary routes are maintained as secondary routes.

Casual observation of recent years seems to be that an F-route gets removed from primary state maintenance when all property owners along that stretch can get reasonable access from somewhere other than the service road. The road then reverts back to secondary maintenance if it remains open.

Mapmikey

[The High Plains Traveler]

New Mexico has a statewide system of state-maintained frontage roads. They have inventory numbers accessible in the state route log, and a few of them - mostly in the southern part of the state - are marked with this number.

Colorado maintains many frontage roads but does not have a marking system. You can tell the state-maintained segments by the existence of signage consistent with state signage standards (e.g., the use of round signpost).

[dgolub]

New York has a complex system of assigning reference markers to service roads.  They get the route number of the road they service, and the rest I don't know off the top of my head.

While they get the interstate that they service on the reference markers, they generally get their own reference route numbers.  Unless they're in New York City, in which case they don't get reference route number, and I'm pretty sure they don't have reference markers.

[roadfro]

Nevada maintains some frontage roads along Interstates, but also in other areas as well. Many are atypical of the majority definition of a frontage road. Descriptions:

• Rural: Found particularly along I-80, but also along some other freeways and highways. These usually function more like two-way access roads in spots (in the case of I-80, the frontage road at some points is actually old US 40). They are not continuous along an entire length of freeway, and may be on both or only one side of the highway (or can cross over from one side to another).
  
  
• Urban: These are along some freeways, but they only exist for small segments. These are the typical style, one-way roads--usually between divided ramps at an interchange, or between successive interchanges.
  
  
• Other Urban: In the frontage road network there are other routes cataloged as "frontage roads", which are really just random roads maintained by NDOT. These also include roads like, just the segment of a cross road at an intersection.
  
  
  Frontage roads are not marked with route signs, but they do typically feature Nevada-style mileposts at beginning and endpoints.

[US71]

Arkansas doesn't do much with Frontage Roads. Fayetteville has Futrall Dr and Shiloh Dr as Frontage/Service roads along I-49, but they stop & start a few times.

[corco]

Montana DOT maintains a frontage road wherever topographically possible- most of the time it's the old US route parallel to the interstate. In most cases these are unsigned roadways that don't even appear in the state route log, but are MDT maintained.

[NE2]

In Virginia, service roads that are along interstates or other primary routes can be maintained by the state.

Most are posted (F-routes).  Although they are built and maintained in a wide range of standards (e.g. anywhere from a gravel driveway to a multilane boulevard), all are considered to be part of the Primary system in Virginia.  Service roads along any secondary routes are maintained as secondary routes.

At least historically, Interstate frontage roads were part of the Interstate system. For example, when I-81 was built south of Natural Bridge and US 11 was moved to overlap, old US 11 was explicitly transferred from the primary system to the Interstate system.

[adventurernumber1]

On Google Maps, I have noticed that Texas has a lot of service/frontage roads. Whether it's out in the country, or in the city, Texas has a lot.

[The Nature Boy]

The Carolinas also have a ton. I think they're just maintained by the state as if they were any other road. County roads are basically non-existent.

[cjk374]

Louisiana maintains service roads along the interstates, but they are all slated to be removed from the system.

[Laura]

In Virginia, service roads that are along interstates or other primary routes can be maintained by the state.

Most are posted (F-routes).  Although they are built and maintained in a wide range of standards (e.g. anywhere from a gravel driveway to a multilane boulevard), all are considered to be part of the Primary system in Virginia.  Service roads along any secondary routes are maintained as secondary routes.

At least historically, Interstate frontage roads were part of the Interstate system. For example, when I-81 was built south of Natural Bridge and US 11 was moved to overlap, old US 11 was explicitly transferred from the primary system to the Interstate system.

Never realized this!

Casual observation of recent years seems to be that an F-route gets removed from primary state maintenance when all property owners along that stretch can get reasonable access from somewhere other than the service road. The road then reverts back to secondary maintenance if it remains open.

Mapmikey

Could you give an example of this?

[Mapmikey]

Here is an example from May 2013 of a Virginia F route being disestablished because alternate access to property became available:

http://www.ctb.virginia.gov/resources/2013/may/reso/Resolution_Agenda_Item_1.pdf

Mapmikey