Not OK but years ago (mid ‘70’s) we had to make several trips from CA to OH and highways in NM were always under construction - well, at least according to signs - all the way to Albuquerque...with signs:
Road work next 4.5678265716 miles - no kidding. No matter how much time there was between trips, those signs were always there and I don’t think we ever saw any construction. I always thought it was because no one knew just how to measure off those miles!
Maybe they were trying to use kilometers, then convert them to miles.