M-15
... that according to the Michigan Department of Transportation, the first highway centerline in the US was painted on the first designation of M-15 in 1917?
... that according to the <a href="./Michigan_Department_of_Transportation" id="mwDto" rel="mw:WikiLink" title="Michigan Department of Transportation">Michigan Department of Transportation</a>, the first highway <a href="./Road_surface_marking" id="mwDts" rel="mw:WikiLink" title="Road surface marking">centerline</a> in the US was painted on the first designation of <b id="mwDtw"><a href="./M-15_(Michigan_highway)" id="mwDt0" rel="mw:WikiLink" title="M-15 (Michigan highway)">M-15</a></b> in 1917?