Even worse than Chattanooga is 24 through Nashville - that to us is the worst part of the drive. 3 or 4 interstates merge and de-merge there and you have to keep switching from left lane to right lane to stay on I24. After that any other interstate merger is a piece of cake! If you have a GPS, make sure that you listen to the and then keep left or then keep right. If you don't have a GPS, stay in the middle lane so that you can follow 24 a little easier when you have to go left or right.
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I know right? That is the worst part!