(1) The portion of highway M-66 beginning at the intersection with highway M-78 in Calhoun county and extending north to the intersection with highway US-131 in Kalkaska county shall be known as the “Green Arrow Route”.

  (2) The portion of highway US-131 beginning at the intersection with highway M-66 and extending north to the intersection with highway US-31 and the portion of highway US-31 beginning at the intersection with highway US-131 and extending north to the straits of Mackinac shall be known as the “Green Arrow Route-Mackinac Trail”.