January 13, 2009 7:10 pm 2009 Detroit Auto Show Green is the key color of the 2009 Detroit Auto Show. US & World Videos 0:27 Street sweeping returns to Philly 1:29 Researchers at University of Delaware help create more convenient ways for electric vehicles to charge 2:22 The election is over, so how can you recycle those signs? 0:50 Developer scraps plans for NJ offshore wind projects 1:34 Prince Albert II of Monaco is helping Grace Kelly's hometown one Philly tree at a time