To be listed as a Pure Michigan Byway, a road must be a state trunkline highway, and it must be nominated through a two-stage process. Candidates are evaluated based on a set of objective criteria by MDOT in a process that can take several years to complete. The criteria include a highway's relationship to sites or districts on the National Register of Historic Places, to recreational areas, or to scenic landscapes. Each candidate must be supported by local stakeholders, including the appropriate local units of government. Each byway has a local organization that produces a management plan for the roadway and the preservation of its surrounding environment.
