We took the 57/24/75 route last December. Youl think Illinois is NEVER going to end, and then, BAM, you are thru Kentucky and Tennessee in no time! I prefer this route over 65 thru Indy. (Tons of traffic.) We had awesome weather last year, and hardly any traffic until outside Valdosta Ga. We stopped just outside of Atlanta to get a good nights sleep, we have 2 kids, and it was worth it to stop. We were in far better shape when we arrived than if we hadn't. This trip was the first time I can remember in my life that we didn't hit rain thru Chattanooga. Just keep in mind the time change and shorter daylight hours for driving in Dec. We wanted to leave around 3:30 a.m.but didn't hit the road 'till about 6. Lost daylight right as we were hitting the mountains...not what we wanted, we had hoped for the kids to enjoy the views. Oh well, we saw them on the way back.
Drive safe and have a great trip!