In this Wednesday, April 24, 2013 photo, traffic signals and vehicles are seen on Wilshire Boulevard in Los Angeles. The nation's most congested city has become a model for traffic control. With the ... more 
In this Wednesday, April 24, 2013 photo, traffic signals and vehicles are seen on Wilshire Boulevard in Los Angeles. The nation's most congested city has become a model for traffic control. With the flip of a switch earlier this year, Los Angeles became a worldwide leader by synchronizing all of its nearly 4,400 stoplights, making it the world's first major city to do so. (AP Photo/Reed Saxon) less 
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Associated Press | Photo By Reed Saxon
Sat, May 25, 2013 8:46 PM EDT