There shall be a system of highways known as the "Primary State Highways System" which shall consist of all existing or proposed highways designated on a map entitled "Primary State Highway System, 1945," prepared by the commissioner and filed in the office of the secretary of state.
RSA 229:2
1945, 188:1, part 1:2. RSA 230:2. 1981, 87:1, eff. April 20, 1981.