Carmageddon

This weekend, Los Angeles will close a 10-mile stretch of the 405 freeway for 53 hours so work crews can conduct demolition that will enable widening of the freeway. Locals are referring to the planned closure as "Carmageddon," anticipating gridlock on nearby roadways that remain open. The hope is that the short-term pain will bring relief of chronic traffic congestion once the widening project's finished. Unfortunately for hopeful Angelenos, adding more road space probably won't relieve congestion. NPR's Guy Raz spoke to University of Toronto economist Matthew Turner, co-author of a study…