San Diego
County Sign Route S12

[Click here for a key to the symbols used. Some county routes were constructed with federal funds. These routes are indicated as FAP (Federal Aid Primary), FAU (Federal Aid Urban), or FAS (Federal Aid Secondary). If no funding source is shown, no federal funds were used. Note that while some segments seem to have the same attributes, they may differ in the county-local road number assigned to the segment, or in the Caltrans Map Sheet number.]

Routing

1. Palomar Airport Road in Carlsbad from Carlsbad Blvd (County Sign Route S21) to the Carlsbad city limits (FAU, 1.20 mi)

2. Palomar Airport Road from the Carlsbad city limits to El Camino Real (County Sign Route S11) (FAU, 2.77 mi)

3. Palomar Airport Road in Carlsbad from El Camino Real (County Sign Route S11) to the Carlsbad city limits (FAU, 2.16 mi)

4. Palomar Airport Road from the Carlsbad city limits to Business Park/White Sands Drive (where it turns into San Marcos Blvd), and then as San Marcos Blvd to Twin Oaks Valley Road in San Marcos (FAU, 4.14 mi)

   History and Signage Information

   It looks like this actually used to be the following:

   • Palomar Airport Road from the Carlsbad city limits to Linda Vista Drive (FAU, 0.06 mi)
   • Encinitas Road from Linda Vista Drve to Rancho Santa Fe (FAU, 1.28 mi)
   • Encinitas Road in San Marcos from Rancho Santa Fe to Twin Oaks Valley Road (FAU, 2.80 mi)

   At some point, Encinitas Road was renamed as San Marcos Drive, and it looks like Linda Vista was renamed to Business Park/White Sands Dr..

5. Twin Oaks Valley Road in San Marcos from San Marcos Blvd (previously Encinitas Road) to Deer Springs Road (previously Sycamore Road) (FAU, 3.10 mi)

6. Deer Springs Road (previously Sycamore Road) from Twin Oaks Valley Road to Deer Springs Road & Sycamore Road (FAU, 0.48 mi)

7. Deer Springs Road from Sycamore Road to I-15 (FAU, 1.66 mi)

History and Signage Information

Status

Acronyms and Explanations:

• "LRN" refers to the Pre-1964 Legislative Route Number. "US" refers to a US Shield signed route. "I" refers to an Eisenhower Interstate signed route. "Route" usually indicates a state shield signed route, but said route may be signed as US or I.
• Previous Federal Aid (pre-1992) categories: Federal Aid Interstate (FAI); Federal Aid Primary (FAP); Federal Aid Urban (FAU); and Federal Aid Secondary (FAS). Current Functional Classifications (used for aid purposes): Principal Arterial (PA); Minor Arterial (MA); Collector (Col); Rural Minor Collector/Local Road (RMC/LR). Note that ISTEA repealed the previous Federal-Aid System, effective in 1992, and established the functional classification system for all public roads.
• Other frequently used terms: California Transportation Commission (Commission or CTC), California Department of Transportation (Department or Caltrans), Regional Improvement Program (RIP), Interregional Improvement Program (IIP), State Transportation Improvement Program (STIP), State Highway Operation and Protection Program (SHOPP), Traffic Congestion Relief Program (TCRP), Clean Air and Transportation Improvement Act of 1990 (Proposition 116), High Speed Passenger Train Bond Program (Proposition 1A), Highway Safety, Traffic Reduction, Air Quality, and Port Security Bond Act of 2006 (Proposition 1B), Corridor Mobility Improvement Account (CMIA), State Route 99 Bond Program (RTE or SR 99), Local Bridge Seismic Retrofit Account (LBSRA), Trade Corridors Improvement Fund (TCIF), Highway-Railroad Crossing Safety Account (HRCSA), State-Local Partnership Program (SLPP), Environmental Phase (PA&ED), Design Phase (PS&E), Right of Way (R/W), Fiscal Year (FY), Active Transportation Program (ATP), Trade Corridor Enhancement Program (TCEP), Local Partnership Program (LPP), Local Streets and Roads Program (LSRP), Solutions for Congested Corridors Program (SCCP).

CR S11 CR S13

© 1996-2020 Daniel P. Faigin.
Maintained by: Daniel P. Faigin <webmaster@cahighways.org>.