4. California
Traffic moves slowly on the 405 freeway in Los Angeles, California July 14, 2011. "Carmageddon" is the name Los Angeles residents are giving the likely epic traffic tie-up that will result when a 10-mile (16-km) stretch of the 405 Freeway is closed for construction, including the demolition of the bridge, from Friday night to Monday morning between two of the nation's busiest interchanges. REUTERS/Eric Thayer (UNITED STATES - Tags: TRANSPORT) - RTR2OW6D
