One of your states in your commemorative set had no mention in the famous ROUTE 66 song by Bobby Troup.

Which State was it?

Not too hard given the distance the highway traversed in the state, but a question I couldn't have answered till I saw your chips and sang the song. The current I44 bypasses the state as well.

I think there are casinos near the old Route 66 in every other state today. Maybe be need a new set of lyrics and change the words to "get your chips, on Route 66"!