Should Route Number Duplication be Used by a Given State?

[US71]

Whenever I-22 is officially in business, it will duplicate Mississippi 22. I can't think of any other highways in the state that share the same number.

Missouri never duplicated in the past (MO 57 became MO 171 after I-57 was built), but now has I-64 and MO 64, plus I-72 and MO 72.

Arkansas will eventually have I-49 and US 49 , but halfway across the state from each other