Good roads ITP?

So I was wondering if there were any good roads that I could do some TT sets on inside the ATL perimeter? Like something similar to Columns drive or Riverside up in Roswell? I live off Riverside now (practically a quarter mile from the Chattahoochee off us-400) but might be moving ITP later on this year. Any suggestions on safe places to ride inside of 285? I can do all my long rides on the weekends up in Alpharetta/Milton.