Highway 27 (between Eglinton and Steeles) is still maintained by Toronto.
Black Creek Blvd. was to be a southern extension of Highway 400 to Weston Rd., is still maintained by Toronto.
Spadina Expressway, now known as Allen Rd., between Sheppard and Eglinton, is still maintained by Toronto.
Other former provincial highways have been maintained by Toronto for decades now. Highway 2, aka Lake Shore Blvd. and Kingston Road; Highway 5, aka Dundas Street West, Bloor Street, and Danforth Road; Highway 11, aka Yonge Street; Highway 11A, aka University Avenue and Avenue Road; Highway 48, aka Markham Road; Highway 50, aka Albion Road.