Back Interstate 405 (Kalifornien) German Interestatal 405 (California) Spanish Interstate 405 (Californie) French Autostrada międzystanowa nr 405 (Kalifornia) Polish Interstate 405 (California) SIMPLE Міжштатна автомагістраль 405 (Каліфорнія) Ukrainian 405号州际公路 (加利福尼亚州) Chinese
&sq=&lang=en&file=File:Question_book-new.svg){kind=small} | This article needs additional citations for verification. (December 2022) |
&sq=&lang=en&file=File:I-405_(CA).svg) Interstate 405 | ||||
|---|---|---|---|---|
| San Diego Freeway | ||||
 I-405 highlighted in red | ||||
| Route information | ||||
| Auxiliary route of I-5 | ||||
| Maintained by Caltrans | ||||
| Length | 72.15 mi[1] (116.11 km) | |||
| Existed | 1964–present | |||
| NHS | Entire route | |||
| Major junctions | ||||
| South end |  I-5 in Irvine | |||
| ||||
| North end | I-5 in Sylmar | |||
| Location | ||||
| Country | United States | |||
| State | California | |||
| Counties | Orange, Los Angeles | |||
| Highway system | ||||
| ||||
Interstate 405 (I-405, locally referred to as The 405)[2] is a major north–south auxiliary Interstate Highway in Southern California. The entire route is known as the northern segment of the San Diego Freeway. I-405 is a bypass auxiliary route of I-5, running along the southern and western parts of the Greater Los Angeles urban area from Irvine in the south to Sylmar in the north.
I-405, heavily traveled by both commuters and freight haulers along its entire length, is the busiest and most congested freeway in the United States.[3][4] The freeway's annual average daily traffic between exits 21 and 22 in Seal Beach reached 374,000 in 2008, making it the highest count in the nation.[5] It has played a crucial role in the development of dozens of cities and suburbs along its route through Los Angeles and Orange counties. It also serves Los Angeles International Airport, Long Beach Airport, and Orange County's John Wayne Airport.
- ^ Starks, Edward (January 27, 2022). "Table 2: Auxiliary Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways". FHWA Route Log and Finder List. Federal Highway Administration. Retrieved March 19, 2023.
- ^ Richards, Gary (November 16, 2015). "Roadshow: Why 'The 405' is called 'The 405'". The Mercury News. Retrieved August 18, 2023.
- ^ "U.S. Highways With the Most Traffic". Time For Kids. Archived from the original on August 11, 2011.
- ^ "I-405 In LA Named Busiest Interstate In Any U.S. City". CBS Los Angeles. August 20, 2013. Retrieved September 20, 2024.
- ^ Office of Highway Policy Information (July 27, 2010). "Most Traveled Urban Highways Average Annual Daily Traffic". Federal Highway Administration. Retrieved January 26, 2013.
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