Not many motorists nor bicyclists know how to properly use and adapt to sharrow lanes. Hopefully, Fred Boykin, who is our City commissioner and also owns Bike South, will post some clarification in the Google group. In the meantime, here is my understanding from reading everything I could find on the subject:
A bike rider should ride right down the center of the sharrow lane, as this indicates:

As the above imbedded article mentions, a bicyclist riding to the right of the sharrows is at risk to run into a quickly opening door of someone who has just parked, or swerve out to avoid the person and door and get hit by a vehicle.
A motorist, when seeing a bicyclist ahead, should slow down until uncoming traffic is far enough away so that he/she can safely swing across the yellow line to allow the mandatory three feet clearance from the cyclist.
What if there are no cars parked on your side of the street for an extended distance? Sycamore Drive between Ponce and Pinehurst is the equivalent of four lanes wide, so one might think it is safer and more courteous to right closer to the curb in this case, thus allowing motorized vehicles to stay in their lane. But if a bicyclist swerves in and out based on where cars are parked, he/she runs the risk a (possibly speeding) vehicle will not see the bike until it is too late. It's safest to just stay in the sharrow lane the entire distance.
Obviously, if you're riding at night or in the low light of dawn or dusk, your bike should be equipped with front and rear reflectors and lights, so vehicles can easily see you (as required by law).
Riding over near the curb implies (to some drivers) you don't feel you have the right to share the roadway, and emboldens some drivers to pass very close to you (even though a 3 ft distance is now required in Georgia).
Remember that adults cannot legally ride on Decatur sidewalks.
Bikers are required by law to stop for stop signs and red lights, but frequently don't, so pedestrians should make sure of what a biker intends to do before crossing the street.
FYI, Georgia Bikes! has a summary of current Georgia bike laws at http://bit.ly/ox2Jqo -- unfortunately I don't see any specific mention of sharrows.
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