I live in Atlanta and the traffic here is always insane (and people here drive like total you-know-whats), but the worst traffic is between 4 PM and 6 PM on I-85 and 285 (the bypass). If you drive to 75 through Atlanta -- which is pretty much the way to go to Orlando from this area -- avoid those hours if possible.We've driven twice and both times we went through Chattanooga. Both times we spent a night IN Chattanooga since that's our halfway point from Central Illinois. Even with construction, I've not had a problem. We drive around Atlanta and the traffic is usually heavy, I can't imagine not taking the bypass.