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Ontario Highway 403

King's Highway 403 (pronounced "four-oh-three"), or simply Highway 403, is a 400-series highway in the Canadian province of Ontario that travels between Woodstock and Mississauga, west of Toronto, branching off from and reuniting with Highway 401 at both ends and travelling south of it through Hamilton (where it is also known as the Chedoke Expressway) and Mississauga.

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