Highway 109 lasted only a few years. There's no need for it. I'm not going to rally for "Historic Highway 50" signs on Albion Road either.
Yeah exactly. I'm thinking main highways that served as important links between major cities, and were either bypassed by 400-series highways (Highway 2 to Highway 401), or highways that have been downloaded because their inter-city prominence has been reduced (Highway 5). Those types of highways were cruicial to the development of Ontario, and their existence/importance even pre-dates the numbering of highways in the 20s. Maybe even put up plaques or something at a few major intersections along the way, just telling a quick story of the importance of that highway.