Also, Highbury Avenue in London, which is a semi-freeway (two interchanges) that was the only part of an unbuilt system there. Highbury Avenue was once Highway 126.There are actually quite a few municipal freeways in the province:
Red Hill Valley Parkway (Hamilton)
Lincoln Alexander Parkway (Hamilton)
E.C. ROW Expressway (Windsor)
Highway 174 (ottawa)
Highway 420 in Niagara Falls is also partially a municipal road even though it is a sort of half-freeway, was once a provincial highway, and serves as the direct connection to a major international bridge.
Freeways that aren't elevated aren't exactly unbelievably expensive to maintain. For example I believe the DVP has a maintenance budget of $300 million for the next 30 years - that's only $10 million/year for a major artery, and one that is at end of life too and runs through a complicated urban environment. More "standard" highways like the Linc will probably have essentially negligible maintenance costs over the long term.
I could see Ford uploading the DVP and Gardiner so that he can institute a widening program - perhaps with leaving the elevated portion of the Gardiner in municipal control.