it's going to take a concerted effort to bring about any large increases in bike commuting in atlanta, unfortunately. unlike flat, gridded cities, where easy alternatives to main roads are common, the roads with the least amount of elevation changes are also the main roads for auto traffic, and are also usually fairly narrow (as are most roads in general in atlanta, outside the freeways)
trails, helped by and including the beltline are becoming more common, but there are fights happening right now on whether or not to give major roads (like peachtree) a diet in order to add bike lanes.
http://news.wabe.org/post/atlanta-of...les-bike-lanes
http://buckheadview.com/2015/09/12/5...-gdot-speaker/
i used to commute by bike to work (on roswell rd in north buckhead/sandy springs) and it was harrowing.