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In page Ontario Highway 6:

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Prior to the establishment of Ontario's provincial highway network in 1920, the route that would become Highway 6 was composed of several early wagon trails created during the early settlement of what was then known as Upper Canada. These trails carved through an otherwise barren wilderness, connecting distant townsites: the Hamilton–Dover Plank Road between Port Dover and Hamilton, the Brock Road between Hamilton and Guelph, and the Garafraxa Road between Guelph and Sydenham (renamed to Owen Sound in 1851) — were opened in the 1830s and 1840s. Further north, the Southwest Diagonal and the Centre Road were built through the Bruce Peninsula in the 1840s and 1920s, respectively.[1][2]