Interstate 405

Interstate 405
Looking eastward at Interstate 405 from the Bristol Street overpass in Costa Mesa near John Wayne Airport (SNA). A collection of signs direct motorists onto the a left exit for the SR 55 carpool lanes and Exit 9 A for the freeway north. 10/25/09

Interstate 405 is the San Diego Freeway, starting at Interstate 5 (Golden State Freeway) in northern Los Angeles and paralleling the coast via the vicinity of Santa Monica, Los Angeles International Airport (LAX), Long Beach and Huntington Beach. The freeway returns to Interstate 5 near the former El Toro Marine Corps Station in Irvine. I-405 is arguably the busiest freeway on the West Coast, with traffic a concern at any time during the day or night.

Interstate 405 California Guides

The I-110/I-405 interchange improvement project expands the northbound ramp from I-405 to I-110 (Harbor Freeway) south and adds a new auxiliary lane along the Harbor Freeway south to Del Amo Boulevard (Exit 8). Ground breaking for the $35 million project took place on June 1, 2018. Work runs through 2021.4

Another major overhaul along Interstate 405 is the Orange County Transportation Authority (OCTA) I-405 Improvement Project (SR-73 to I-605) started in winter 2018. Costing $1.9 billion, five years of construction widens 16 miles of the freeway, from Euclid Street (Exit 12) in Fountain Valley to Interstate 605 near Long Beach and Seal Beach. An additional general use lane will be added per direction along with two tolled express lanes along the stretch. Work will also rebuild 18 bridges. Upon completion, the Orange County Transportation Authority will operate the new managed lanes, which will charge rates depending upon traffic flow and time of day.5 HOV eligible traffic will be able to use the carpool lanes at no charge, but will still be required to use a FasTrak transponder.

I-405 Sepulveda Pass Improvement Project

A $1.1 billion, 10 mile expansion project along Interstate 405 started in 2009 and wrapped up on May 23, 2014. Over budget by $100 million and delayed by a year, the massive overhaul of I-405 included two closures of the freeway dubbed "Carmageddon" by officials and the media. The main crux of the project was the addition of a new northbound carpool lane from I-10 to U.S. 101. Work also replaced overpasses for Mulholland Drive, which resulted in the first Carmageddon -- a weekend shutdown of I-405 in July 2011, Skirball Center Drive and Sunset Boulevard. 27 interchange ramps were realigned, and 13 additional bridges were widened.1

During its construction through west Los Angeles near Santa Monica and Los Angeles International Airport (LAX), the San Diego Freeway was planned as part of former California 7. With the advent of the national Interstate Highway System, the San Diego Freeway was designated as Interstate 405 from Irvine to the San Fernando Valley.

References:

  1. "405 freeway carpool lane set to open before Memorial Day weekend." KPCC (Southern California Public Radio), May 13, 2014.
  2. "Wilshire I-405 ramps reopened early in time for Labor Day weekend." WLS-TV Chicago, August 31, 2012.
  3. "405 Freeway's Wilshire Boulevard Onramp Closing Thursday." NBC4 Los Angeles - KNBC, August 21, 2013.
  4. "Groundbreaking held for project to improve 110/405 interchange." Metro - Los Angeles County Metropolitan Transportation Authority - The Source, June 1, 2018.
  5. "Construction to begin on a $1.9 billion widening of the I-405 freeway in Orange County." The Orange County Register (CA), January 19, 2018.

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Page Updated Sunday June 24, 2018.