Ontario Highway 40
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| Maintained by the Ministry of Transportation of Ontario | |||||||||||||
| Length: | 91.4 km (56.8 mi) | ||||||||||||
| Existed: | March 28, 1934 – present | ||||||||||||
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| South end: |
 Highway 401 (Exit 90) in Chatham-Kent
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| North end: |
 Highway 402 (Exit 6) in Sarnia
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King's Highway 40, commonly referred to as Highway 40, is a provincially maintained highway in the southwestern portion of the Canadian province of Ontario. The route links Chatham and Sarnia via Wallaceburg, following close to the St. Clair River. The southern terminus is at Highway 401 south of Chatham, while the northern terminus is at Highway 402 in Sarnia.
Highway 40 was built as a depression-relief project in 1934. The original routing followed what is now the St. Clair Parkway, but was rerouted to create that scenic road in the mid-1970s. The Sarnia Bypass was built between 1963 as Highway 40A and renumbered as Highway 40 by 1965; the original route through Sarnia became Highway 40B until it was decommissioned during the early-1990s. The route was extended to Highway 3 in Blenheim during the early 1970s; however this section would be the sole part of Highway 40 decommissioned during the Ontario highway transfers. The route is 91.8 km (57.0 mi) long.
Highway 40 begins at an interchange with Highway 401 (Exit 90) southeast of the urban centre of Chatham, within the Municipality of Chatham-Kent. Southwest of the interchange is C.M. Wilson Conservation Area, a 30 hectares (74 acres) campground named for the former Chair of Directors of the Lower Thames Valley Conservation Authority, Clarence Michael Wilson. The highway proceeds northwest as Communication Road, passing between farmland on the outskirts of Chatham. It crosses a Canadian National Railway (CN) mainline followed by the Thames River, then turns southwest onto Grand Avenue East and crosses a Canadian Pacific (CP) railway line. The highway progresses from the outskirts of Chatham to downtown before turning onto St. Clair Street and travelling northwest. It encounters the Nortown Centre mall as it passes through the suburbs and eventually leaves the city.
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