In this episode, we complete our exploration of numbering of state highways by turning our attention to the County Signed Route system. This system, started in 1959, uses a blue pentagon with yellow numbers, and applies to significant routes at the county level. It is the last episode in a four part miniseries on highway numbers in California. In this episode we talk about the history of the County Signed Route system, how the routes are numbered, some significant county signed routes, and what is happening with the system today.
There is no interview. We’re going to move the interview segments into separate bonus episodes, owing to the difficulty of obtaining and scheduling the interviews.
There are two episodes left in the season: one exploring highway naming, and one exploring the organizations related to the state highways.
Here’s the link to the show:
And here’s the link on Spotify for Podcasters:
Here are some relevant links (I may edit this to add more links in later):
- California Highways:
- Signed County Route G1
- Signed County Route G14
- Sign County Route G15 and the 1923 Metz Tunnel
- Signed County Route G17
- Signed County Route G20
- Signed County Route J1 and former California State Route 180 on Panoche Road
- Signed County J2 over Corral Hollow Pass; ghost towns, ghost rails and The Old Road (El Camino Viejo)
- Signed County Route J4 and un-built California State Route 239
- Signed County Route J37; the last Signed Tulare County Route and the Lone Pine to Porterville High Sierra Road
- Trans-Sierra Highway Passes; Sherman Pass Road and Signed County Route J41
- Linear Referencing Systems (examples):
- CSUN: Links to all California Counties, Cities, etc. GIS Data
- Alameda County Open Data
- Fresno County GIS Portal
- Humboldt County Maintained Road System
- Inyo County GIS (no road maps)
- Imperial County Road Maps
- Kern County GIS
- Los Angeles County GIS
- Mono County Opendata Portal
- Orange County Open GIS
- Riverside County ARCGIS
- Santa Barbara: No road or infrastructure GIS, but the Transportation Page has a road inventory
- San Benito County GIS / OpenGIS
- San Bernardino County GIS
- San Diego County GIS
- San Luis Obispo County Roads GIS
- Tulare GIS
- Ventura County GIS
Episode 1.11 will explore highway naming.
We encourage you to explore our back catalog through this site or our Spotify for Podcasters home.