Michigan Highway 90 runs east-west at the base of Michigan's "Thumb", in the east-central portion of Lower Michigan. The eastern end of Michigan Highway 90 is at Michigan Highway 25 in Lexington. Lexington is a small town on the western shore of Lake Huron's southern reaches. From Lexington, Michigan Highway 90 heads west on a route stretching for about 44 miles. It uses Michigan Highway 19 to slide a bit southerly to a new westerly path; it later slides back north on Michigan Highway 53 to another westerly path. The western end of Michigan Highway 90 is at Michigan Highway 24 near Fostoria. West of Lexington, Michigan Highway 90 serves the towns of Croswell, Peck, Brown City, and North Branch.
My photo of a Michigan Highway 90 marker comes from the route's eastern terminus in Lexington. The signage depicted is a junction marker, announcing the upcoming junction with Michigan Highway 90 to northbound travelers on Michigan Highway 25. I photographed this southward-facing signage in April 2021, on the trip around Metro Detroit and Michigan's Thumb.