It’s interesting to know that none of those ring roads started out as freeways.
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In Ontario AFAIK almost all of the freeways were built from scratch on fresh land. We tend to not upgrade existing roads to freeway status, rather we build a fresh freeway parallel to the road.
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Hehehe you just aren’t aware.

Highway 6 from Highway 403 to a bit past Hamilton Airport is a staged freeway, and it may be twinned and further grade-separated in the near future. This one was recently built too (i.e. 2006).
Then there’s the 406, which used to have 2 lanes and intersections until 2015. This was Woodlawn Avenue @ 406 in 2014:
https://maps.app.goo.gl/gjeG9g31AcJWpbJB9?g_st=ic
Highway 40 from Sarnia to that turn west of Wallaceburg is a staged freeway. If you look closely, the ROW is ~ 80 m (much wider than the usual 45 m for undivided rural highways) and access is limited.
Highway 17 from end of 417 to Old Highway 653 around Town of Renfrew then from Pembroke to Petawawa is also like that. That’s why MTO can just twin and grade-separate 17 all the way up to Renfrew and a bit beyond.
Other than those examples, I agree that twinning isn’t commonplace in Ontario.