Plaque of Mystery Helps Navigate old Traverse City

This plaque is located on one of the bridges over the Boardman River. It uses the term “trunk line”, a reference to the main roads that connect one city to another. When this bridge was constructed (1931), the south entrance to the city was not Division Street (M 31S) as it is now. Instead, travelers came down Rennie Street (Veterans Drive), turned right onto Fourteenth Street and proceeded to Front, turning east to leave town. Upon what bridge–Union Street north or south, Cass Street north or south—can you find this plaque? By the way, it seems to be in a state of terrible disrepair.