John J. Kanillopoolos, Dual and Triple Routing on State Trunklines (1983)
“ Stop M-28 at US-41 south of Marquette and select new markers for the route from US-141 to the Wisconsin state line - M-28 is a continuous route along the northern portion of the U.P. and would be impractical to change this route number. An alternative would be to have US-41 which intersects with US-2, go west to existing US-141, then replace existing US-141 up to M-28. This would require a new route number between Rapid River and Marquette for the existing US-41. ”
