Quebec Autoroute 540 (Vaudreuil-Dorion)
Autoroute 540 (Vaudreuil-Dorion) was a short spur route that connected Autoroute 20 to Autoroute 40, providing a direct freeway link from Windsor, Ontario (via Highway 401) to Quebec City, Rivière-du-Loup, and points east through A-40, as A-20 currently has several at-grade intersections in Vaudreuil-Dorion as a multi-lane divided road. A-540 was the shortest numbered Autoroute.
The road became part of a ring road around the western edge of the Montreal metropolitan area. In December 2012 A-540 was re-designated as an extension of Autoroute 30, while the old alignment of A-30 south of Salaberry-de-Valleyfield was renamed Autoroute 530, becoming more or less, a full southern ring road of Montreal with A-30.
Read more about Quebec Autoroute 540 (Vaudreuil-Dorion): Interchanges From South To North