Pedestrians and the walking culture have moved into the mainstream in metro Atlanta, writes one of the region’s leading pedestrian advocates. What was sparked by the 1996 Summer Olympics has now become a full-fledged movement, thanks to a host of players: the Atlanta Regional Commission and its Livable Centers Initiative; Georgia Tech with Tech Square in Midtown; Georgia State with its expansion downtown; and the embracing of public transportation. But, as our second columnist notes, we still have a long way to go in regard to completing our sidewalk and pedestrian safety mission.