In my opinion, when interstate status is given to the whole corridor for routes like US 64, 264, and 70, they should move the US routes back onto the original old/alternate/business routes
where possible. IMO having multiple highways of the same number can be confusing.
US 264 in particular has a completely contiguous, well-maintained, fairly modern 2-lane highway clear from Zebulon to Greenville that is now signed as 264 ALT for most of its length.
US 64 has a contiguous route too but some parts of it are pretty ancient and would need to be upgraded, particularly between Zebulon and Spring Hope but probably a few other stretches as well.
US 70 is more of a basket case where gaps abound. These are mostly places where the existing US 70 is still on its original alignment AND where I-42 when it is complete is not going to move. There would be gaps between Princeton and Goldsboro, then between La Grange and Kinston, a small gap between the end of te future Kinston bypass and Dover, and finally between James City and Havelock. So one could easily question whether it would be worth it or not.
LGL44VL