Michigan Highway 157 is a short north-south connector just east of Prudenville, in north-central Lower Michigan. The highway is only about a mile long, connecting Michigan Highway 18's northern leg to Michigan Highway 55's eastern leg out of Prudenville. As Michigan Highway 18 moves southerly, curving southwesterly north of Michigan Highway 55, Michigan Highway 157 provides a shortcut for travelers going from the north toward the east, or from the east toward the north. Predictably, the northern end is at Michigan Highway 18, and the southern end is at Michigan Highway 55, about a mile away. This whole situation is east of Houghton Lake--in fact, the eponymous lake's eastern shore is right nearby.
My photo of Michigan Highway 157 signage comes from its southern end at Michigan Highway 55. The guide assembly depicted identifies the turn onto Michigan Highway 157 to those traveling eastbound on Michigan Highway 55. This photo was taken in March 2019, as I was driving around the middle portions of the Lower Peninsula.