Southern California freeways
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The Southern California freeways are a network of interconnected freeways in the megaregion of Southern California, serving a population of 22 million people. A comprehensive freeway plan was produced in 1947 and with construction beginning in the 1950s. The plan hit opposition and funding limitations in the 1970s and by 2004 some 61% of the original planned network had been completed.
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Southern California's romance with the automobile owes in large part to resentment of the Southern Pacific Railroad's tight control over the region's commerce in the late 19th and early 20th centuries. During his successful campaign for governor in 1910, anti-Southern Pacific candidate Hiram Johnson traveled the state by car (no small feat at that time). In the minds of Southlanders, this associated the automobile with clean, progressive government, in stark contrast to the railroads' control over the corrupt governments of the Midwest and Northeast. While the Southern Pacific-owned Pacific Electric Railway's famous Red Car streetcar lines were the axis of urbanization in Los Angeles during its period of spectacular growth in the 1910s and 1920s, they were unprofitable and increasingly unattractive compared to automobiles. As cars became cheaper and began to fill the region's roads in the 1920s, Pacific Electric lost ridership. Traffic congestion soon threatened to choke off the region's development altogether. At the same time, a number of influential urban planners were advocating the construction of a network of what one widely-read book dubbed "Magic Motorways", as the backbone of suburban development. These "greenbelt" advocates called for decentralized, automobile-oriented development as a means of remedying both urban overcrowding and declining rates of home ownership.
Traffic congestion was of such great concern by the late 1930s in the Los Angeles metropolitan area that the influential Automobile Club of Southern California engineered an elaborate plan to create an elevated freeway-type "Motorway System," a key aspect of which was the dismantling of the streetcar lines, to be replaced with buses that could run on both local streets and on the new express roads. In the late 1930s when the freeway system was originally planned locally by Los Angeles city planners, they had intended that there were to have been light rail tracks installed in the center margin of each freeway (these would presumably have carried Pacific Electric Railway red cars), but this plan was never fully implemented.
Planning and construction 
During World War II, transportation bottlenecks on Southern California roads and railways convinced many that if Southern California was to accommodate a large population, it needed a completely new transportation system. The city of Los Angeles favored an upgraded rail transit system focused on its central city. However, the success of the Arroyo Seco Parkway, built between Los Angeles and Pasadena in 1940, convinced many that a freeway system could solve the region's transportation problems. Leaders of surrounding cities, such as Whittier, South Gate, Long Beach, and Pasadena, accordingly called for a web of freeways to connect the whole region, rather than funneling their residents out of their own downtowns and into that of Los Angeles. Pro-freeway sentiments prevailed, and by 1947, a new comprehensive freeway plan for Los Angeles (based largely on the original locally-planned 1930s system, but without the light rail tracks in the median strips of the freeways) had been drawn up by the California Department of Public Works (now "Caltrans"). San Diego soon followed suit, and by the early 1950s, construction had begun on much of the region's freeway system.
By the 1970s, many cities in the United States, including Los Angeles, were experiencing widespread freeway and expressway revolts, there was significant political opposition and the 1973 oil crisis raised fuel prices dramatically. Growing interest in mass transit resulted in reduced funds being available for freeway construction. The tax revolt of the time also reduced the resources available for infrastructure development and California Proposition 13, which was enacted in 1978, also reduced funds available for highway construction. The 1982 Surface Transportation Assistance Act mandated that a some 11% of the Highway Trust Fund should be used for mass transit schemes. The Century Freeway, which opened in 1993 following widespread community opposition, is likely to be the last freeway built using traditional funding.
Overall, only 61% of the freeway miles proposed in the 1954 master plan were built (as of 2004) with a number of key freeways left incomplete or un-built; the Long Beach and Glendale freeways were not completed and the Laurel Canyon and Beverly Hills freeways were never started. Other routes which presented expensive engineering challenges (e.g. the Angeles Crest and the Decker Freeways) were also dropped. The result was a system with gaps and bottlenecks.
By contrast, San Diego County is nearing completion of its originally planned freeway system and is using regional sales tax money to support various extensions and building new toll roads like State Route 125 to fill in the remaining gaps. The only major freeway not built was State Route 252 through Barrio Logan. Since the 1980s, nearby Orange County embarked on a program of tollway construction using local funds, and began to apply local financing to freeway construction as well after the turn of the 21st century with the passage and extension of Measure M.
Revival of interest in mass transit 
After a deep recession in the early 1990s caused by the collapse of the defense industry at the end of the Cold War and the closure of naval bases, Southern California began to grow again in the latter part of the decade. As in many other cities with rapidly growing populations, the region's infrastructure has had difficulty in keeping up. Traffic congestion in Los Angeles is the worst in the nation, and has been the worst since at least the early 1980s. However, even in the face of the state budget crisis of the early 2000s, plans have been drawn up to radically expand the region's transportation network to accommodate population growth that has already swelled the region's population to 18 million (as of the U.S. Census of 2010) and may see it grow to 25 or even 30 million in the coming decades. Environmentalist sentiments, high fuel prices, and the dearth of available land may result in future development taking a pattern along the mass transit-oriented lines of the "smart growth" school's recommendations.
Beginning originally in the 1970s, a variety of factors, including environmental concerns, an increasing population, and the high price of gasoline, led to calls for mass transit other than buses. In 1976, the State of California formed the Los Angeles County Transportation Commission to coordinate the Southern California Rapid Transit District's efforts with those of various municipal transit systems in the area and to take over planning of countywide transportation systems. The SCRTD continued planning of the Metrorail Subway (the Red Line), while the LACTC developed plans for the light rail system. After decades, the wheels of government began to move forward, and construction began on the Los Angeles County Metro Rail system in 1985. In 1988, the two agencies formed a third entity under which all rail construction would be consolidated. In 1993, the SCRTD and the LACTC were finally merged into the Los Angeles County Metropolitan Transportation Authority which constructed subway lines and which today continues to construct new light rail and rapid transit lines.
Proposed/future freeways 
Caltrans or local transportation agencies have identified the following priority freeway projects:
- A new freeway across the Santa Ana Mountains to relieve congestion on State Route 91, Riverside Freeway, and provide a route between the Inland Empire and southern Orange County.
- A new freeway, the Mid County Parkway from Perris to San Jacinto.
- Extension to Interstate 710, Long Beach Freeway, to its originally planned terminus at Interstate 210, Foothill Freeway, in Pasadena, via a tunnel underneath the city of South Pasadena.
- An extension to the State Route 241 toll road to meet Interstate 5 in San Clemente.
- An extension to State Route 905/future Interstate 905 to reach the Otay Mesa border crossing, with a junction at State Route 125 and future State Route 11.
- Upgrade to State Route 71, Chino Valley Freeway, north of State Route 60, Pomona Freeway, to Interstate 10, San Bernardino Freeway, in Pomona.
- Upgrade to State Route 55, Costa Mesa Freeway, from south of its current freeway terminus at 19th Street in Costa Mesa to State Route 1, Pacific Coast Highway, in Newport Beach, potentially via a tunnel.
- Construction of the High Desert Corridor, a freeway and expressway between State Route 14, Antelope Valley Freeway, in Palmdale and Interstate 15, Mojave Freeway, near Victorville
- Addition of high occupancy vehicle and high occupancy toll lanes to freeway segments currently lacking them.
- Construction of lower-inclined alternate alignments on steep segments of freeway, to enable trucks to climb mountain passes more easily and speed up the flow of automobile traffic.
Freeway names 
Southern California residents idiomatically refer to freeways with the definite article, as "the [freeway number]", e.g. "the 5" or "the 10". This use of the article differs from other American dialects, including that of Northern California, but is the same as in the UK (e.g. "Take the M1 to the M25") and other European countries (e.g. "La A1"). In addition, sections of the southern California freeway system are often referred to by names rather than by the official numbers. For example, the names Santa Monica and San Bernardino are used for segments of Interstate 10 even though overhead freeway signs installed at interchanges since the 1990s don't display these names, using instead the highway number, direction, and control city. A freeway 'name' may refer to portions of two or more differently numbered routes; for example, the Ventura Freeway consists of portions of U.S. Route 101 and State Route 134.
Named interchanges 
- Four Level (Bill Keene Memorial): US-101/SR-110
- East Los Angeles: I-5/US-101/I-10/SR-60
- Hollywood Split (Bruce T. Hinman Memorial): US-101/SR-134
- Judge Harry Pregerson: I-105/I-110
- El Toro Y: Southern junction of I-5/I-405
- Kellogg: I-10/SR-57/SR-71
- Orange Crush: I-5/SR-22/SR-57
- Newhall Pass (Clarence Wayne Dean Memorial): I-5/SR-14
- Glendora Curve: I-210/SR-57
- Jack Schrade (Mission Valley Viaduct): I-8/I-805
Other named features 
- South Bay Curve: where Interstate 405 bends from north–south to east–west in Torrance
- Sepulveda Pass: Interstate 405 just south of U.S. Route 101 near the J. Paul Getty Museum.
- Cahuenga Pass: the Hollywood Freeway just south of the interchange with the Ventura Freeway
- Figueroa Street Tunnels: the northbound lanes of the Pasadena Freeway between the Four Level Interchange and the interchange with the Golden State Freeway
- Glendora Curve: the transition of the northbound 57 Orange Freeway to the westbound 210 Foothill Freeway; or the eastbound 210 transition to the southbound 57. Formerly part of Interstate 210 before the completion of the newer section of the Foothill Freeway in 2003.
Comparisons and 'firsts' 
- First freeway in California (Arroyo Seco Parkway linking Pasadena and Los Angeles)
- First stack interchange (Four Level Interchange in downtown Los Angeles)
- First grade-separated HOV lanes
- First fully automated tollway system (91 Express Lanes in northern Orange County)
The Southern California area has fewer lane-miles per capita than most large metropolitan areas in the United States, ranking 31st of the top 39. As of 1999, Greater Los Angeles had 0.419 lane-miles per 1,000 people, only slightly more than Greater New York City and fewer than Greater Boston, the Washington Metropolitan Area and the San Francisco Bay Area. (American metros average .613 lane-miles per thousand) San Diego ranked 17th in the same study, with 0.659 lane-miles per thousand, and the Inland Empire ranked 21st, with 0.626.
Limited-access roads not maintained by the state 
The following of Limited-access roads are not maintained by the state:
- Colorado Street former routing of State Route 134 from Interstate 5 to San Fernando Road just west of Glendale
- Colorado Freeway former routing of State Route 134 from Colorado Blvd in Eagle Rock to the Ventura Freeway
- Oak Grove Drive in Pasadena, former routing of the Foothill Freeway
- Shoreline Drive in Long Beach
- La Cienega Boulevard in the Baldwin Hills, originally intended to be part of the discontinued Laurel Canyon Freeway
List of freeways 
Major freeways leading into and out of Southern California 
- Interstate 5 south terminus at San Ysidro in San Diego, northbound to the Central Valley
- John J. Montgomery Freeway from the U.S.-Mexico border crossing at San Ysidro to Downtown San Diego
- South Coast Freeway from the U.S.-Mexico border crossing at San Ysidro to the San Diego-Orange County Line.
- San Diego Freeway from Downtown San Diego to the El Toro Y
- Santa Ana Freeway from the El Toro Y to the East L.A. Interchange
- Golden State Freeway from the East L.A. Interchange to Wheeler Ridge
- Interstate 8 west terminus in Ocean Beach in San Diego, eastbound to the Arizona State Line
- Interstate 10 west terminus in Santa Monica, eastbound to the Arizona State Line
- Interstate 15 south terminus in Barrio Logan in San Diego, northbound to the Nevada State Line
- Wabash Freeway (signed as State Route 15) from Barrio Logan in San Diego to Interstate 805
- Escondido Freeway from Interstate 805 to the San Diego-Riverside County Line
- Temecula Valley Freeway from the San Diego-Riverside County Line to Lake Elsinore
- Corona Freeway from Lake Elsinore to Corona
- Ontario Freeway from Corona to San Bernardiono
- Mojave Freeway, also Barstow Freeway, from Devore to the Nevada State Line
- Interstate 40 west terminus in Barstow, eastbound to the Arizona State Line
- U.S. Route 101 south terminus at the East L.A. Interchange, westbound to Santa Barbara then northbound to the Central Coast
- State Route 14, south terminus at Tunnel Station, northbound to Bishop
San Diego area 
- Interstate 5
- Interstate 8
- State Route 52
- State Route 54
- State Route 56
- State Route 67
- State Route 75
- State Route 78
- State Route 94
- State Route 125
- State Route 163
- Interstate 805
- State Route 905
Controlled access routes not maintained by the state 
- Kearny Villa Road near Naval Air Station Miramar, former routing of U.S. Route 395
- Pacific Highway near San Diego International Airport (Lindbergh Field), former routing of U.S. Route 101
- Friars Road in Mission Valley near Qualcomm Stadium (formerly Jack Murphy Stadium)
Inland Empire Metropolitan Area 
(Includes San Bernardino, and Riverside Counties)
- Interstate 10
- Interstate 15
- Interstate 40
- State Route 60
- State Route 71
- State Route 91
- Interstate 210 and State Route 210
- Interstate 215
Greater Los Angeles 
(includes Los Angeles, Orange, Ventura Counties)
- State Route 1
- State Route 2
- Interstate 5
- Interstate 10
- State Route 14
- State Route 22
- State Route 23
- State Route 33
- State Route 47
- State Route 55
- State Route 57
- State Route 58
- freeway stub east from Barstow
- State Route 60
- State Route 71
- State Route 73
- State Route 90
- State Route 91
- U.S. Route 101
- State Route 103
- Interstate 105
- Interstate 110
- State Route 110
- State Route 118
- State Route 133
- State Route 134
- State Route 138
- State Route 170
- Interstate 210 and State Route 210
- State Route 241
- State Route 261
- Interstate 405
- Interstate 605
- Interstate 710
- http://latimesblogs.latimes.com/thedailymirror/2008/06/june-15-1938.html "Motorways Plan Revealed: System of Roads Designed to Cure Traffic Ills," Los Angeles Times, June 15, 1938
- Hall, Peter Cities in Civilization: Culture, Technology, and Urban Order, London, Weidenfeld & Nicolson, 1998; New York, Pantheon Books, 1998 See section on Los Angeles
- "Stop the Road Freeway Revolts in American Cities". Journal of Urban History. "This article analyzes the freeway revolts that erupted in American cities in the 1960s and early 1970s. Until the mid-1960s, state and federal highway engineers had complete control over freeway route locations. New federal legislation in the 1960s gradually imposed restraints on highway engineers, providing freeway fighters with grounds for legal action."
- http://www.sandag.org/index.asp?fuseaction=about.history sandag.org
- http://www.floodgap.com/roadgap/252/ floodgap.com
- http://tti.tamu.edu/documents/mobility_report_2007.pdf tti.tamu.edu
- http://www.octa.net/ice.aspx Missing or empty
- http://www.pe.com/localnews/inland/stories/PE_News_Local_S_midcounty03.4225303.html Missing or empty
- http://www.dot.ca.gov/dist07/710study/ Missing or empty
- http://octa.net/socmis_background.aspx Missing or empty
- http://www.dot.ca.gov/dist11/facts/SR-905_feb2010.pdf Missing or empty
- http://www.mission71project.com/ Missing or empty
- http://octa.net/55_access.aspx Missing or empty
- http://www.dot.ca.gov/dist07/travel/projects/high-desert-corridor/ Missing or empty
- http://www.metro.net/projects/expresslanes/ Missing or empty
- http://www.publicpurpose.com/hwy-tti99ratio.htm publicpurpose.com
Further reading 
- Carney, Steve. "From Superhighways To Sigalerts: Freeways Have Become Part Of Southland's Identity." Los Angeles Daily News, 21 September 1999, p. N4. ^
- Hise, Greg (1999). Magnetic Los Angeles: Planning the Twentieth-Century Metropolis. Johns Hopkins University Press. ISBN 0-8018-6255-8.
- Taylor, Brian (2004). "The Geography of Urban Transportation Finance," pp 294–331 in Hanson and Giuliano eds., The Geography of Urban Transportation, 3rd Edition. The Guilford Press. ISBN 1-59385-055-7.
- Schrank and T. Lomax, The Urban Mobility Report 2007. Texas Transportation Institute.
- The History of Southern California Freeway Development
- Los Angeles Area Highways Page
- California Department of Transportation Live Streaming Traffic Cams
- California Highway Patrol Los Angeles Traffic Incident Information Page
- Sigalert Los Angeles Traffic Report
- Los Angeles Freeway Descriptions
- California Department of Transportation Named Freeways (PDF file)
-  Southern California Trucking Accidents
- California Institute for Telecommunications Wireless Traffic Reports for Southern Cal
- The Urban Mobility Report 2007, Texas Transportation Institute