Interstate 405, Interstate bypass in Los Angeles and Orange Counties, United States.
Interstate 405 is a road in Los Angeles County and Orange County, California, stretching roughly 72 miles (116 km) through Southern California. It links residential neighborhoods with business districts, universities, and three major airports along its path.
Work on the road began in 1954, and the first sections opened in 1957 under the name Route 7. The designation changed later to reflect its role as an Interstate Highway.
Many commuters plan their day around traffic patterns on this road, checking conditions before leaving home or work. Radio stations dedicate regular segments to reporting delays and incidents along its length.
Express lanes run between Costa Mesa and the county line, with pricing that adjusts according to current traffic levels. These lanes offer an alternative when congestion builds up during peak hours.
The stretch between the Seal Beach exits sees about 374,000 vehicles pass through each day. This makes it one of the most traveled freeway sections in the entire country.
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