Interstate 405 (California)

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.

San Diego Freeway
Route information
Auxiliary route of
Length	72.415 mi (116.541 km)
Existed	1964–present
Major junctions
South end	in Irvine
Major intersections	in Irvine in Costa Mesa in Seal Beach in Long Beach in Carson near LAX in West Los Angeles in Westwood in Sherman Oaks in Mission Hills
North end	near San Fernando
Highway system
Interstate Highway System Main Auxiliary Suffixed Business Future State highways in California Interstate US State Scenic History Pre‑1964 Unconstructed Deleted Freeways
← →

Exits

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.

County	Location	Postmile	Exit	Destinations	Notes
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

Interstate 405 (California) Media

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  The Bristol exit near South Coast Plaza and the Segerstrom Center for the Arts, with Saddleback in the background

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  The I-405 freeway as seen from a plane landing at Los Angeles International Airport

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  I-405 near the interchange with the Ventura Freeway (US 101)

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  The 405 in the Sepulveda Pass*The 405 in the Sepulveda Pass

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  1955 map of the planned Interstates in the Los Angeles area; present-day I-405 roughly corresponds to the 1955 proposed route through the western regions of the area.

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  Temporary terminus during construction at the Sunset Boulevard interchange in 1957. The interstate continues into Sepulveda Boulevard via a temporary connector road.

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  Civil engineers Marilyn Jorgenson Reece (left) and Carol Schumaker, at the Reece-designed I-10/I-405 interchange, 1964

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  Aerial view from the north of I-405's interchange with I-105 near Los Angeles International Airport from directly above Arbor Vitae Street; the hills of the Palos Verdes Peninsula are visible in the distance