Colorado DOT's 2018 pavement survey puts 20.0% of its 11,345 state highway miles in the LOW drivability-life class, with the share highest in Lincoln County (46.4%), Morgan (42.3%) and Jackson (40.1%); this is one state, not a national figure.
What it shows: Lincoln is the largest at 46.4%, followed by Morgan at 42.3%; the smallest shown is Moffat at 30.5%.
Data and chart by CalcScrape: Tire Cost Calculator