Mich. Comp. Laws § 247.952
It is the intent of the legislature to establish this state's responsibility for the enhancement and enjoyment of Michigan's scenic, recreational, and historic resources along its roadside by identifying and designating certain portions of the state trunk line highway system as Pure Michigan byways. It is further the intent of the legislature in designating Pure Michigan byways to assign responsibility for the development of the byways and for the establishment and application of specific planning and design criteria and procedures appropriate to the byways. The legislature further intends to provide criteria for the location and length of Pure Michigan byways and adjacent areas requiring continuing and careful coordination of planning, design, construction, maintenance, land use, and development, by state and local agencies as appropriate, to encourage adjacent land use consistent with the intent of the designation.
MCL 247.952