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SigAlert.com
Includes live freeway speed maps and traffic incident summaries for many locations around the state.

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.

Jeff's Streets Page
Information, ideas, and views on Northern California facilities, with an emphasis on the Santa Cruz and Monterey Bay areas.

Historic Highways of Southern and Central California
Examines the area's highway past, present and future.

California Highway Routes
Brief history and status of every numbered highway in the state.

California Highways and Bridges
Photos, articles and vintage construction information about California's road network.

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.

Bay Area Miata Association Backroads Index
Backroads and byways of the San Francisco Bay Area, written from a sports-car driver's perspective.

California Highway Patrol Traffic Incident Information
Live traffic incident information from the CHP computer system.