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Interstate 405 (California)
|San Diego Freeway|
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I-405 highlighted in red
|Auxiliary route of I-5|
|Defined by S&HC § 615|
|Maintained by Caltrans|
|Length:||72.415 mi (116.541 km)|
|Existed:||1964 – present|
|South end:||I-5 in Irvine|
|North end:||I-5 near San Fernando|
|Counties:||Orange, Los Angeles|
Auxiliary route of the Interstate Highway System
Interstate 405 (I-405) is an Interstate Highway in the Orange and Los Angeles counties of California. It is a spur route of the Interstate 5. It goes from the I-5 near San Fernando, through the west side of Los Angeles and Long Beach before ending back at the Interstate 5 near Irvine. It is the busiest highway in the United States, mainly because it is the only highway in the west side of Los Angeles that goes from north to south. It also passes important places such as Los Angeles International Airport and the ports of Los Angeles and Long Beach.
Except when a letter is put before it, postmiles were measured on the road as it was in 1964, based on how it was at the time, and do not necessarily show the current mileage. R reflects a change in the route since then, M indicates a second change, L refers an overlap because of a correction or change, and T indicates postmiles that were temporary (for a full list of prefixes, see the list of postmile definitions). Segments that have not been built or are now controlled locally may be left out. The numbers start again at county lines; the start and end postmiles in each county are given in the county column.
- Template:Caltrans trucklist
- "U.S. Highways With the Most Traffic". Time For Kids. http://www.timeforkids.com/TFK/teachers/wr/article/0,27972,1099514,00.html.
- Santa Monica College Corsair News Article Archived August 15, 2007, at the Wayback Machine
- Office of Highway Policy Information (July 27, 2010). "Most Travelled Urban Highways Average Annual Daily Traffic". Federal Highway Administration. http://www.fhwa.dot.gov/policyinformation/tables/02.cfm.
- "California Log of Bridges on State Highways: District 7". October 2006. http://www.dot.ca.gov/hq/structur/strmaint/brlog/logpdf/logd07.pdf. Retrieved September 19, 2019.
- California Department of Transportation, All Traffic Volumes on CSHS, 2005 and 2006
- Howe, Dan (April 17, 2007). "I-405 Northbound". California Numbered Exit Uniform System. California Department of Transportation. http://www.dot.ca.gov/trafficops/exit/docs/fourofivenorth.pdf.
Howe, Dan (April 17, 2007). "I-405 Southbound". California Numbered Exit Uniform System. California Department of Transportation. http://www.dot.ca.gov/trafficops/exit/docs/fourofivesouth.pdf.