California's vast terrain is connected by an extensive system of freeways, expressways, and highways. California is known for its car culture, giving California's cities a reputation for severe traffic congestion. Construction and maintenance of state roads and statewide transportation planning are primarily the responsibility of the California Department of Transportation (Caltrans). The rapidly growing population of the state is straining all of its transportation networks, and a recurring issue in California politics is whether the state should continue to aggressively expand its freeway network or concentrate on improving mass transit networks in urban areas.

One of the state's more visible landmarks, the Golden Gate Bridge was completed in 1937. With its orange paint and panoramic views of the bay, this highway bridge is a popular tourist attraction and also accommodates pedestrians and bicyclists. It is simultaneously designated as U.S. Route 101 which is part of the El Camino Real (Spanish for Royal Road or King's Highway), and State Route 1 which is also known as the Pacific Coast Highway. Another of the seven bridges in the San Francisco Bay Area is the San Francisco – Oakland Bay Bridge, completed in 1936. This bridge transports approximately 280,000 vehicles per day on two-decks, with its two sections meeting at Yerba Buena Island.

Los Angeles International Airport and San Francisco International Airport are major hubs for trans-Pacific and transcontinental traffic. There are about a dozen important commercial airports and many more general aviation airports throughout the state.

California also has several important seaports. The giant seaport complex formed by the Port of Los Angeles and the Port of Long Beach in Southern California is the largest in the country and responsible for handling about a fourth of all container cargo traffic in the United States. The Port of Oakland, fourth largest in the nation, handles trade from the Pacific Rim and delivers most of the ocean containers passing through Northern California to the entire USA. Caltrans builds tall "stack" interchanges with soaring ramps that offer impressive views

Intercity rail travel is provided by Amtrak California, which manages the three busiest intercity rail lines in the US outside the Northeast Corridor. Integrated subway and light rail networks are found in Los Angeles (Metro Rail) and San Francisco (MUNI Metro). Light rail systems are also found in San Jose (VTA), San Diego (San Diego Trolley), Sacramento (RT Light Rail), and Northern San Diego County (Sprinter). Furthermore, commuter rail networks serve the San Francisco Bay Area (ACE, BART, Caltrain), Greater Los Angeles (Metrolink), and San Diego County (Coaster). The California High Speed Rail Authority was created in 1996 by the state to implement an extensive 700 mile (1127 km) rail system. Construction was approved by the voters during the November 2008 general election, a $9.95 billion state bond will go toward its construction. Nearly all counties operate bus lines, and many cities operate their own bus lines as well. Intercity bus travel is provided by Greyhound and Amtrak Thruway Coach.

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