As the Atlanta Beltline grows in length and popularity, it's building a public-space culture with a definite learning curve. Runners, walkers, bikers, dog owners and skaters need to acquaint themselves with the rules and challenges of the trail. Today, a Beltline leader offers how best to use the trails in a spirit of cooperation and selflessness, while a transportation executive reflects on her Atlanta childhood  and the potential the project has for personal as well as urban renewal.

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Today's columnists: