Michigan Highway 40 is a north-south highway in inland southwestern Michigan. It runs from Holland to Allegan, then from Allegan through Paw Paw to a point near Mottville, north of Bristol, Indiana. The northern end is on the south side of Holland, at US Route 31 (and a Business Loop of Interstate 196). Michigan Highway 40 runs south-southeasterly to Allegan from there. At Allegan, Michigan Highway 40 turns to head nearly due-south. It passes through Paw Paw, Lawton, and Marcellus, to end at US Route 12 a few miles shy of the Indiana border. The tiny town of Mottville lies just to the east of this endpoint, and Bristol, Indiana, is a few miles to the south. Mottville has the northern end of Michigan Highway 103, which continues southward into Indiana; since its northern end is so close to the southern end of Michigan Highway 40, I personally am unsure why the two routes don't have the same number.
My photo of Michigan Highway 40 comes from the southern terminus at US Route 12, just west of Mottville. The photo shows the first northbound reassurance marker for vehicles departing from the intersection with US Route 12. Indiana lies a few miles to the south. This photo was taken in February 2019, on a day trip touring around southwest Michigan.