Edward N. Hines
[5] This led to the passage of the County Road Law in 1893,[6] and a change to Michigan's Constitution in 1894.[8] Hines was appointed to the Wayne County Board of Roads at its inception in 1906, along with Henry Ford and Cassius R.[4][5] Hines originated the concept of painting a line down the center of a road to separate traffic in opposing directions.[5] Painted center lines were first used in 1911 on River Road in Trenton, in Wayne County.[2] This simple idea has since been recognized as one of the most important single traffic safety devices in the history of highway transportation.