| California Department of Transportation: Caltrans is the state agency responsible for highway, bridge, and rail transportation planning, construction, and maintenance. |
| California Highways Home Page: Gives detailed history and other information on county, state, U.S. and Interstate facilities in the state. Includes links to pages within the cahighways.org domain. |
| 91 Express Lanes: Information on the toll roadways on the Riverside Freeway (State Route 91) in metro Los Angeles. |
| Advanced Highway Maintenance and Construction Technology Research Center: UC Davis and Caltrans highway research center. |
| Bay Area Miata Association Backroad Drives: Backroads and byways of the San Francisco Bay Area, written from a sports-car driver's perspective. |
| California FasTrak: This electronic toll collection system lets drivers electronically pay tolls on California's bridges and toll roads without stopping. |
| California Highway Patrol Traffic Incident Information: Live traffic incident information from the CHP computer system. |
| California Highway Routes: Brief history and status of every numbered highway in the state. |
| California Highways @ WestCoastRoads.com: Statewide coverage. |
| California Highways and Bridges: Photos, articles and vintage construction information about California's road network. |
| California Motorcycle Roads: Descriptions of scenic and challenging backroads. |
| Casey's Roads and Highways Page: Covers many aspects, including Historic U.S. highways and the unusually-numbered I-238. |
| DLK's Highway Page: Several freeway plans for the San Francisco Bay Area and California highway signs. |
| Dr. Roadmap, LLC: Information on both a book and a board game on Los Angeles alternate routes, as well as information on their creator. |
| Floodgap Roadgap: Documents unusual and former routings in the southern part of the state. Includes photographs. |
| Freeways of San Francisco: Photos and information on some built and unbuilt freeways. |
| Friends of Southern California's Highways: A community grass-roots organization dedicated to the rebuilding and expansion of the regional freeway and thoroughfare system. |
| HaltTheRamp.com: Citizen's campaign against the plan to reconstruct the end of San Francisco's Central Freeway. Site includes historical background and links to official sites. |
| Historic Highways of Southern and Central California: Examines the area's highway past, present and future. |
| I-680 Smart Lane: A section of the southbound carpool lane in Alameda and Santa Clara Counties is being considered for conversion to a Smart Carpool Lane or High Occupancy Toll (HOT) Lane. |
| In Our Path: Describes the process of the construction of I-105 (Century Freeway) near Los Angeles. |
| Jeff's Streets Page: Information, ideas, and views on Northern California facilities, with an emphasis on the Santa Cruz and Monterey Bay areas. |
| ReBuild California: Labor/contractor group advocating increased public investment in state infrastructure, including mass transit and highways. |
| SigAlert.com: Includes live freeway speed maps and traffic incident summaries for many locations around the state. |
| South Bay Expressway: Automated FasTrak toll road in San Diego to open Fall 2006 that will service Chula Vista, Bonita, and Otay Mesa, connecting SR-54 to the Mexico border as part of SR-125. Site includes news and project overview. |
| The Big Highways Page: Information and tidbits from a Southern California perspective. |
| The Ridge Route Preservation Organization: Maps, photos and history of the pioneer highway between Bakersfield and Los Angeles. |
| The Ups & Downs of Highway 1 (Smithsonian Magazine): Addresses the erosion problem on the Pacific Coast Highway (SR 1). |
| Transportation Corridor Agencies: Builds and manages toll roads in Orange County. Includes toll and transponder information, proposed extensions, and discounts. |
| Unofficial Road Information For Highway 1, Big Sur: Information about old closures of SR 1 (Pacific Coast Highway) at Big Sur due to a landslide. |
| Widen I-205 Now: Group wishing to petition the state government to allot money for the widening of the highway near Tracy. Site includes event listing and news. |
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