Michigan Highway 109 is the access road to Sleeping Bear Dunes National Lakeshore, on the northwestern edge of Lower Michigan. Both ends of Michigan Highway 109 anchor on Michigan Highway 22, and Michigan Highway 109 passes into and out of the National Park Service property. As Michigan Highway 22 generally moves north-northeasterly across the area, Michigan Highway 109 carves an alternative path that's roughly due-north turning sharply to due-east. The southern end of Michigan Highway 109 is just north of Empire, and the northeastern end is at Glen Arbor (again, both ends are at Michigan Highway 22).
My photo of a Michigan Highway 109 marker shows a junction marker along Michigan Highway 22, seen as northbound travelers approach the northeastern end of Route 109. The northeastern end of Michigan Highway 109 in Glen Arbor lies ahead, into the background of the photograph, and the signage here warns northbound drivers of just that. I'm not sure why Michigan Highway 22 is mentioned on the junction assembly as well, since the people seeing the assembly are already on that route. This picture was taken during the Traverse City trip of March 2018.