San Diego Freeway | ||||
![]() I-405 highlighted in red | ||||
Route information | ||||
Auxiliary route of I-5 | ||||
Maintained by Caltrans | ||||
Length | 72.415 mi[1] (116.541 km) | |||
Existed | 1964–present | |||
NHS | Entire route | |||
Major junctions | ||||
South end | ![]() | |||
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North end | ![]() | |||
Location | ||||
Country | United States | |||
State | California | |||
Counties | Orange, Los Angeles | |||
Highway system | ||||
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Interstate 405 (I-405) is an Interstate Highway in the Orange and Los Angeles counties of California. It is a bypass 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. It also forms a western bypass around Center Los Angeles.[2][3][4]
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