It would be rather neat if Memphis was listed underneath Fulton.
I know, I-69 probably will not reach Memphis for at least 15-20 years (if we are lucky), however, this is the way to get to Memphis if you live in Evansville, SW Indiana, or western Kentucky. Why not?
Memphis would still be a logical control city since the Parkway dumps you onto US 51, which also has a control city of Memphis once you get to Tennessee.
However, Memphis is in Tennessee and why should the citizens of Kentucky pay for a sign that has a TN city if lieu of a logical KY one. It isn't like I-65 south out of Nashville TN that has a control city of Huntsville. There isn't a logical control city for TN unless you want it to read Ardmore TN or perhaps Spring Hill, Columbia or Pulaski.
Fulton, KY is about the same size as Ardmore, TN and Ardmore, AL combined, FWIW.
Having never been through Ardmore, I cannot speak to it, but I've been to or through Fulton several times, and it doesn't seem to be as big as it apparently is.
I think it's goofy to have Fulton listed on the Pennyrile Parkway at Henderson or where it intersects the WK. Fulton made sense for the Purchase at I-24, since it's the southern terminus of the Purchase, but even then I doubt if most traffic on the Purchase has Fulton as its ultimate destination. I'd venture to guess that most regional traffic is headed to Mayfield or Murray; more long-range travelers are likely going to Union City, Dyersburg or Memphis.
Kentucky has done a lot of goofy things in regards to signage along I-69.
It's goofy that Elizabethtown is used as a control city. I-69 doesn't get within 100 miles of there.
It's goofy that mileage is given for places such as Providence and Morganfield, yet never for Evansville or Union City.
It's goofy that no "Temp 69" or "To 69" signs are used along the US 41 stretch in Henderson County.
What kind of logic says a state should only use cities within that state as control cities? That is never a requirement. In Kentucky alone, Cincinnati, Nashville and Knoxville are all used as control cities. I guess they should take Nashville off of I-24 and replace it with Oak Grove.
IMO, Memphis and Evansville should be the control cities for the entire length between the two cities.