The original pathway along the Grand River Avenue corridor was an Indian trail, a footpath used by the native population. The first European settlers to the area now known as Michigan also used this trail and in some areas enlarged it for the passage of wagons. In Detroit, Grand River is one of five major avenues (along with Woodward, Michigan, Gratiot, and Jefferson) planned by Judge Augustus Woodward in 1805 that extended from Downtown Detroit in differing radial directions; Grand River Avenue extends northwesterly from the city's downtown. In the middle of the 19th century, the trail was expanded into a plank road that formed the basis for one of the first state trunkline highways as M-16 in the early 20th century. Later, the highway was rerouted to replace M-126 and create M-104. Current segments of the roadway are still part of the state highway system as sections of M-5, M-11, M-43 or business loops off I-96. The portion of Grand River Avenue in Detroit between I-96 and the intersection with Cass Avenue and Middle Street in Downtown Detroit is an unsigned state trunkline, sometimes referred to as Old Business Spur I-96 (Old BS I-96).