Has Mississippi or Alabama made clear their intentions for what will happen to old alignments of US 78 once I-22 is officially designated?
In Mississippi, great pains were taken to move US 78 from its old alignment to the new I-22 alignment leaving the old alignment signed as Miss. 178. Same thing for much of the route with Alabama 118. Addresses were changed, signs were installed, and old habits were amended. So I can't see ADOT or MDOT returning 78 to its former locations.
Does that mean I-22 and US 78 will be (redundantly) multiplexed or will US 78 replace its replacement?