Down the road, the controls should probably be Memphis and Evansville, but until the bridge is built over the Ohio River and Tennessee builds their part of I-69, I can see why Kentucky would keep Fulton and Henderson, that and good old provincialism. Based on my trip down the WK Parkway several years ago, leaving Elizabethtown, Kentucky had no problem giving the distances to Paducah, Owensboro and Hopkinsville. I see no reason why Hopkinsville and Fulton couldn't be listed heading south on I-69 out of Henderson. The really radical thing would be to sign Nashville heading south, I bet there's some traffic heading all the way down there via 69 and the Pennyrile.