The state highway commissioner, subject to the approval of the advisory board to the state highway commissioner and state administrative board, is hereby authorized and directed to lay out and establish not to exceed 500 miles of additional trunk line highways on such routes as are best adapted for serving the demands of public travel in various sections of the state. In addition, all roads that have been improved as federal aid projects, and all roads that have been, or that may hereafter be, approved for federal aid, shall be trunk line highways and subject to all provisions of law relating thereto.

    The title to a portion of a state trunk line highway that is located in a county with a population of more than 9,000 but less than 9,700 and that was approved for abandonment by a county road commission on January 15, 1968 and approved for abandonment by the state administrative board on May 7, 1968 vests in the county that has jurisdiction over that portion as of the date of abandonment.

     The state highway commissioner, subject to the approval of the advisory board of the state highway commissioner and state administrative board is hereby authorized to change, alter or abandon the location of any portion of any trunk line highway now established or which may hereafter be established by legislative authority whenever such change, alteration or abandonment will, in their opinion, best serve the public interest and will not increase the trunk line mileage: Provided, That the state administrative board shall, before approving the abandonment of any portion of a state trunk line highway, hear the objection of any county road commissioners or the governing body of any township, city or village to whose jurisdiction such portion of state trunk line highway would return if abandoned and such county road commission or the governing body of any township, city or village shall be given 30 days' notice by the secretary of the state administrative board of such hearing of abandonment. Any mileage saved by such change, alteration or abandonment of location may be used in the establishment of new trunk lines on routes to be determined by the state highway commissioner, subject to the approval of the advisory board of the state highway commissioner and state administrative board.

     When the board of county road commissioners or the governing body of the city or village to whose jurisdiction any trunk line highway would return upon relinquishment of jurisdiction by the state, by resolution, indicates that it does not wish to accept jurisdiction of the entire width of the right of way of such trunk line highway, the highway commissioner is hereby authorized and empowered to absolutely discontinue and abandon that part of the width of the right of way not accepted. Upon the absolute abandonment and discontinuance of any part of the width of the right of way of a state trunk line highway, public utilities shall have the easement and right to maintain, alter or remove all facilities existing in that portion of such highway absolutely discontinued and abandoned, and the highway commissioner shall make note of such easement and right in the order of discontinuance and abandonment. The commissioner shall record the order in the appropriate register of deeds office. The recording of the order shall constitute the final and absolute abandonment of the portion of the width designated.