How does closing off traffic in downtown Baltimore on Sundays sound? No honking horns, screeching brakes or gridlocked congestion.

Maybe the air would be a little cleaner to breathe, too, while sight-seeing at theInner Harbor, hiking up Federal Hill, walking across the cobblestones in Fells Point and eating hard-shell crabs outside in Canton. You?d be able to ride your bike around to all those places, as well.