 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.The State Trunkline Highway System was created on May 13, 1913, by an act of the Michigan Legislature; at the time, one of the system's divisions corresponded to the initial segment of M-140.