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, branching off from and reuniting with
Highway 401 at both ends and travelling south of it through
Hamilton and Mississauga. It is
concurrent with the
Queen Elizabeth Way (QEW) for from
Burlington to
Oakville. Highway 403 is also known as the
Chedoke Expressway within Hamilton. Although the Highway 403 designation was first applied in 1963 to a short stub of freeway branching off of the QEW, the entire route was not completed until August 15, 1997, when the
Brantford to the then-still independent Town of
Ancaster section was opened to traffic.