Interstate 405 in southern California, part of the San Diego Freeway for its entire length, is a loop branch of Interstate 5. It splits off from I-5 in the northern San Fernando Valley, travels south through the Santa Monica Mountains, and generally mirrors the path of the Pacific coast thereafter (albeit 5-10 miles inland). It rejoins I-5 at the El Toro Y, a notorious traffic congestion point, near the former El ToroMarine Corps airbase in central Orange County.
Detailed information on I-405, including cities through which it passes and freeways with which it intersects, can be found on the San Diego Freeway page.
Washington
Interstate 405 in Washington state is a 30-mile loop route that bypasses downtown Seattle east of Lake Washington. The northern terminus is in Alderwood, Washington and the southern terminus is in Tukwila. The highway runs through what has since become the "Eastside" technology center of Redmond, Bellevue, and Kirkland, making it an often congested commuter path. I-405 is known for its meandering "s-curves" through Renton. It intersects with Interstate 90 and a number of major state routes. Its official name is "Renton Freeway," though it is not signed as this. Interstate 405 was laied overtop of historic Secondary State Highway 2A.
Interstate 405 in Oregon is a short loop route, also known as the Stadium Freeway, that connects downtown Portland west of the Willamette River to Interstate 5. I_405 only travels through the city of Portland. It opened to traffic on Feb. 25, 1969. It contains an interchange intended for the cancelled I_505.
Interstate 405, colloquially referred to as "The four-oh-five", is one of the principal north-south highways in Southern California, and the major bypass of I-5 running through Southern California.
Interstate 405 is a heavily traveled thoroughfare by commuters and freight haulers along its entire length and has earned its place as one of the busiest and most congested freeways in the world.
I-405 from Hawthrone Boulevard to I-605 opened in 1966, and the portion between I-605 to the El Toro Y opened in 1970.
The San Diego Freeway; the Interstate 405 segment is highlighted in red, the Interstate 5 segment is highlighted in blue.
The San Diego Freeway (now Interstate 5) turns due south in Mission Viejo and continues in that direction until it reaches the bluffs overlooking the Pacific Ocean in Dana Point, at which point it once again turns southeastward to follow the contour of the shoreline.
While dangerous high-speed chases along the San Diego Freeway are not uncommon, perhaps the most famous chase in its history was also one of the slowest.
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