I've been curious what the least travelled portion of interstate and general freeways are. Curious to hear what y'all have to say, my pick is in the upper peninsula of Michigan where i-75 has 3891 vehicles per day (both sides combined) between M-134 and M-48
AADT is easily found for most states, Michigan has a map at https://mdot.maps.arcgis.com/apps/webappviewer/index.html?id=50dd462048fd4971998567699698f285
Here ya go:
https://www.aaroads.com/forum/index.php?topic=28578.0