Physically, it's big enough to drive through, but with all the traffic and construction I wouldn't try it.
Marta has a train station inside the airport, it will cost them $3 ($1.50 fare and $1.50 for a Marta card.) to ride the train, have them go to the first stop which is the College Park station. Have them call you when they get to the station, meanwhile about 1.5 miles north on Main St. is a grocery store, you can hang out there. Then, you drive down Main, pick them up at the curb, and head off.
Now-2014 Sierra 346RETS 5er BUB
Then-2002 Keystone Springdale 286RLDS TT
Nights camped in 2014-28, 2015-127, 2016-10