Highway 12 (Ontario)

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Highway 12 is a provincial highway in the Canadian province of Ontario, and part of the Trans-Canada Highway system for a portion of its route.

The highway presently begins at the hydro easement (Highway 407 alignment) just south of the community of Brooklin in the town of Whitby, joining Highway 7 at the south edge of Brooklin. The highway formerly extended southward to Highway 401 at interchange 410, but this portion was downloaded to the Durham Regional Municipality in 1997. The downloaded portion, called Baldwin Street north of Taunton Road, and Brock Street southward, has retained the name "Highway 12" for historical reasons, but is no longer considered part of the provincial highway.

From the southern junction, Highway 12 shares its routing with Highway 7 for about 38 kilometres north to Sunderland, where Highway 7 turns to the east and Highway 12 continues northward. This is the entry point of the Trans-Canada Highway.

The highway then follows the eastern shore of Lake Simcoe, by-passing Beaverton, then curves to the north-west around Simcoe's northern shore towards Orillia. Here, it bypasses Orillia, and shares routing with Highway 11 northerly for about two kilometres between interchanges 131 and 133. At the latter interchange, Highway 12 then heads northwest towards Coldwater, where it routes onto Highway 400 between interchanges 141 and 147.

At Waubaushene, the Trans-Canada Highway follows The 400 towards Parry Sound and Sudbury, Highway 12 again heads westwards, passing Victoria Harbour, Port McNicoll, and the Martyrs' Shrine, and ends at an intersection with Highway 93 at the western city limits of Midland.