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Interstate Freeway 405


I-405 OverviewI-405 Completed ProjectsI-405 MIS/PSR/EIR  | West County Connectors 


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I-405 Overview

Whether you are heading to Orange County's beautiful beaches, shopping at world-class retail centers, experiencing live performances, catching flights, commuting to work or carpooling children, chances are you will use the San Diego Freeway (I-405). More than 300,000 motorists traverse this interchange daily, making it one of the 10 busiest in the United States.