History of King's Highway 40A:
King's Highway 40A was a temporary designation assigned to the Sarnia Bypass in the 1960s. Construction began on the new Sarnia Bypass in 1963, following
the assumption of Churchill Road and Modeland Road as a new provincial highway on May 1, 1963. The new Sarnia Bypass was completed and officially opened to
traffic on October 25, 1963. Initially, the Sarnia Bypass was designated as Highway 40A, but it was later renumbered as Highway 40 two years after the
route was completed. In 1965, Highway 40 assumed the entire route of Highway 40A along the new Sarnia Bypass. The Highway 40A designation was permanently
retired.
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