A little history about Northwestern Highway
From MichiganHighways.org:
The freeway portion of M-10 in Detroit and Southfield is officially known as the John C. Lodge Freeway, however several of the route’s former names are still used by some. The actual “John C. Lodge Expwy” originally only ran from Downtown Detroit out to the “Linwood Curve,” halfway between the Davison and Wyoming Ave. A surface roadway—Northwestern Hwy—traditionally ran from Wyoming Ave northwesterly out of the city and into Oakland Co. When the freeway was extended in the early 1960s, the portion from the “Linwood Curve” west through the “Wyoming Curve,” then northwesterly along the path of Northwestern Hwy to 8 Mile Rd was named “James Couzens Expwy.”
As the freeway was extended from 8 Mile Rd to Telegraph along Northwestern Hwy, the new freeway retained the name “Northwestern Hwy.” It wasn’t until the 1980s that MDOT decided to—officially or unofficially—rename the entire freeway the “John C. Lodge Frwy” from downtown Detroit to Telegraph Rd. Ironically, though, the service drives along M-10/John C. Lodge Frwy still retain their original names (as service drives, anyway). From downtown to Wyoming Ave, the service drives are named “John C. Lodge,” from Wyoming to 8 Mile, the service drives as” James Couzens,” and from 8 Mile to Telegraph, they’re known as “Northwestern Hwy.”