Ontario Highway 140
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| Route information | ||||
| Maintained by the Ministry of Transportation of Ontario | ||||
| Length: | 10.9 km (6.8 mi) | |||
| Existed: | October 5, 1972 – present | |||
| Major junctions | ||||
| South end: |
 Highway 3 – Port Colborne
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| Highway 58A – Townline Tunnel | ||||
| North end: | Main Street – Welland | |||
| Location | ||||
| Counties: | Regional Municipality of Niagara | |||
| Major cities: | Port Colborne, Welland | |||
| Highway system | ||||
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King's Highway 140, commonly referred to as Highway 140, is a provincially maintained highway in the Canadian province of Ontario. The highway connects Port Colborne near Lake Erie with Highway 406 in Welland, via the Main Street Tunnel. It was constructed in the early 1970s as part of the Welland Bypass project of the Welland Canal, which resulted in the severance of several highways and rail lines. Opened to traffic in late 1972, several months following the tunnel, Highway 140 has remained unchanged since, despite growing calls to resign it as an extension of Highway 406.
Highway 140 begins at an intersection with Highway 3 on the eastern edge of Port Colborne. From there, Highway 3 continues east to Fort Erie; to the west it becomes Niagara Regional Road 3. The roadway carrying Highway 140 continues south of Highway 3 as a local road named Elizabeth Street, whereas Highway 140 travels north, to the west of forestland and a quarry. The highway parallels the Welland Canal throughout its length, always within 2 kilometres (1.2 mi) of the waterway. Wooden high-tension powerlines parallel the highway until it diverges, curving towards the northeast immediately north of Chippawa Road. It travels diagonally for several kilometres before ascending on an overpass and crossing the former Canadian National Humberstone Subdivision tracks.
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