'Carmageddon' Part 2: Los Angeles' 405 Freeway Shutdown

A group of people monitor construction crews demolishing a portion of the Mulholland Drive bridge along the 405 Freeway September 29, 2012 in Los Angeles, California. The 405 Freeway is completely shut down for a 10 mile stretch this weekend for the demolition that is part of a larger $1-billion freeway improvement project. (Jonathan Alcorn/Getty Images)