[4][5] 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.

[5] The highway ends approximately 1 kilometre (0.62 mi) north of this point at an intersection with Main Street (Niagara Regional Road 27).

By 1968, construction was underway on tunnels at East Main Street and at the Port Colborne – Welland townline.

On May 20, 1972, the Main Street Tunnel was opened to traffic at a morning ceremony featuring local officials and the Welland Police Association Pipe Band.

[16] The following table lists the major junctions along Highway 140, as noted by the Ministry of Transportation of Ontario.