§ 56. State to maintain roads improved by state appropriations under
special laws. When any highway has been constructed or improved under a
special law, with moneys taken from the state treasury and under plans
prepared by a state department, the commissioner of transportation may
at any time inspect such highway and if he determine it to be of
sufficient importance and properly constructed, he may make an order
directing that such highway become a part of the system of state
highways in such county, and thereafter such highway shall be maintained
as a state highway. Such order shall be served upon the chairman of the
board of supervisors, and a certified copy thereof shall be filed in the
office of the county clerk and one in the office of the state
comptroller.