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In page Ontario Highway 402:

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Planning for the route that would become Highway 402 began following the completion of the Blue Water Bridge in 1938. A divided highway was constructed through Sarnia following World War II; it was completed and designated in 1953.[1] The Department of Highways announced its intent to extend the route to Highway 401 in 1957.[2] However, while some preliminary work began in the early 1960s, it would take until 1968 for a preferred route to be announced,[3] and until 1972 for construction to begin.[4] Work was carried out through the remainder of the 1970s, and the freeway was completed and ceremonially opened in late 1982.[5] Since completion as a four-lane route, expansion work has been concentrated on the portion of the freeway in Sarnia approaching the border crossing.[6]