It passes South Coast Plaza before a partial interchange with SR 73, which serves as a partially-tolled bypass of I-405 between Costa Mesa and Laguna Niguel. After passing the airport, the freeway enters Costa Mesa and has an interchange with SR 55. It then continues through Irvine, passing north of UC Irvine and then along the northern boundary of John Wayne International Airport. The freeway passes immediately south of the Irvine Spectrum Center mall before intersecting with State Route 133 (SR 133). I-405 begins at the El Toro Y interchange in southeastern Irvine in Orange County, splitting from its parent I-5 and inheriting that route's San Diego Freeway title I-5 continues north as the Santa Ana Freeway. The Bristol exit near South Coast Plaza and Segerstrom Center for the Arts, with Saddleback in the background It also serves Los Angeles International Airport (LAX), Long Beach Airport (LGB) and Orange County's John Wayne Airport (SNA). It has played a crucial role in the development of dozens of cities and suburbs along its route through Los Angeles and Orange counties. 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. 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. 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 near San Fernando in the north. The entire route is known as the northern segment of the San Diego Freeway. Interstate 405 ( I-405) is a major north–south auxiliary Interstate Highway in Southern California.
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