Each year, California's Department of Transportation ranks the freeways where drivers spent the most time in heavy traffic. Here is the list of the Top 10 "most congested" freeways, on a county level, for 2012. Caltrans uses a metric called "vehicle hours of delay," which measures the extra time cars, trucks and buses spent on a road when they were going 35 mph or slower.
Route; County; "Vehicle Hours of Delay"
5; Los Angeles; 6,581,609
405; Los Angeles 5,722,148
101; Los Angeles; 4,516,141
60; Los Angeles; 4,440,585
5; Orange; 3,346,209
10; Los Angeles; 3,294,890
210; Los Angeles; 3,152,598
405; Orange; 3,119,284
580; Alameda; 2,648,174
80; Alameda; 2,520,715
Source: California Department of Transportation "Mile Marker" performance report, released February 2014.
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