LOS ANGELES, CA – JULY 15: Detour signs are posted at the Burbank ramp over the Interstate 405 thirty minutes before the shutdown of the freeway to demolish the Mulholland Bridge over Interstate 405 at the Sepulveda Pass on July 15, 2011 in Los Angeles, California. Los Angeles city officials are advising residents to stay home or stay away from the area during what has become known as “Carmageddon,” the 11-mile shutdown of Interstate 405 for 53 hours over the weekend, for fear of massive traffic jams. (Photo by Kevork Djansezian/Getty Images)