Kings Highway 12, part of the Central-Ontario Route of the Trans-Canada Highway.

Not much comparison between the Trans-Canada Highway (TCH) and the U.S Interstate, I'm afraid. Originally a Vancouver, B.C - Halifax, N.S. route across Canada, the TCH has had numerous "diversions" added to it's path, primarily in Ontario.

Truly Trans-Canadian traffic would not divert off the Manitoba to Quebec Highway 17 (& 417). This alternative path taking you through Central and Southern Ontario is formed by the "Georgian Bay" Route of the TCH which (driving south from Sudbury) encompasses Highway 69 and a small part of 400 linking with this "Central Ontario Route", formed by Highway 12 then 7-East which brings you back up to re-join Highway 17 East of Ottawa.

(Uh, did you have a map beside you when reading all of that? Cartography is not one of my specialties) Virtually all of the Trans-Canada designated Highways in Ontario look more or less like this: 2-lanes, undivided.

This shot was taken just north of the Hwy 12 - Hwy 7 junction, to the west of Lindsay not far from Lake Simcoe.