There is semi traffick on those back roads. They were banned at one time decades ago.
locals like moi also use the back roads to avoid highways and Interstates.
Those back roads also interconnect small towns.
Lots of trucks also use parts of 47, 45, and 1 presumably to avoid the weigh stations and interstate traffick or as a short cut.
I'm talking about the dead end 3 mile road my Aunt and Uncle live on in Dwight. 4 houses in that 3 mile stretch. Very nice blacktop.
And similar roads. Not transportation corridors, or even arterials.
Sure as hell isn't paved with just their property taxes