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The California I-405 actually begins when it splits from the I-5 at the north end of the San Fernando Valley and stretches to the city of Irvine where it rejoins the I-5 once more. It is the most heavily travelled freeway in the United States, with more traffic on it at 2AM than on all the major freeways going through Little Rock, Arkansas during rush hour.

As the popular song goes, nobody walks in LA.