M-140 is maintained by the Michigan Department of Transportation (MDOT) like other state highways in Michigan. MDOT's surveys in 2010 showed that the highest traffic levels along M-140 were the 10,176 vehicles daily near in Watervliet; the lowest count was 1,536 vehicles per day along Pokagon Road, on average. All of M-140 is a two-lane, undivided highway, except sections in cities like Watervliet which may have up to four lanes. No section of the trunkline has not been listed on the National Highway System, a network of roads important to the country's economy, defense, and mobility.