Michigan Highway 37 is a long north-south highway across western Michigan. It runs from the Battle Creek area north through Grand Rapids to Traverse City and the Old Mission Peninsula. The southwestern end of Interstate 94's business loop through Springfield and Battle Creek is also the southern end of Michigan Highway 37. From there, Michigan Highway 37 and Business Loop I-94 share the road up into Springfield, where the routes split up. Michigan Highway 37 continues north from there to Hastings, and northwesterly to Grand Rapids. Between Grand Rapids and Traverse City, Michigan Highway 37 stays between US Route 31 and US Route 131. It's a rural route during this stretch, serving small towns like Newaygo, White Cloud, Baldwin, and Mesick. US Route 31's northerly path makes an easterly turn to join Michigan Highway 37 into Traverse City. Michigan Highway 37 then becomes the main route up the small, narrow Old Mission Peninsula. The route ends at the parking lot to the Old Mission Point Lighthouse, at the northern tip of the peninsula.
My photo of a Michigan Highway 37 marker comes from the east side of Grand Rapids. The signage depicted is a set of guide markers facing south along Michigan Highway 37 at the junction marking the western endpoint of Michigan Highway 21. I looked north toward the junction of the two routes when I snapped this photograph in March 2018. I was driving back from a trip to Traverse City at this time.