Quebec Autoroute 30

The main 143 km (89 mi) segment extends from Autoroute 40 in Vaudreuil-Dorion to Route 133 in Sorel-Tracy.

From the junction of Autoroute 20 in Vaudreuil-Dorion to Route 138 in Châteauguay a completely new freeway was constructed between 2007 and 2012, opening to traffic in December 2012. This new section, built under a Public-Private Partnership, along with the former A-540 west of Vaudreuil make up the first 38 km (24 mi) of the highway now. An approximately 21-kilometre (13 mi) long section bypasses the Mohawk territory of Kahnawake and the South Shore communities of Saint-Constant, Delson, and Candiac. The Kahnawake bypass was built following the 1990 Oka Crisis and extended to the other three communities between 2005 and 2011.[4] The A-30 was originally intended to supplant Route 132, crossing Kahnawake to a junction with the Honoré Mercier Bridge. Local opposition to the proposed route from the late 1960s coupled with the disruption of the Oka Crisis in 1990 prompted the decision to change the course of the new autoroute to bypass the Mohawk territory[9] This new alignment resulted in the 1990 construction, 1992 twinning, then the 2010 redesignation of a 3.2 km (2.0 mi) portion of highway as Autoroute 730. The A-730 now extends from the A-30 mainline in Saint-Constant to Route 132 in Sainte-Catherine. Another 3.2 km (2.0 mi) section from the existing A-30 to Route 132 in Candiac has been redesignated Autoroute 930 since construction of the Jean-Leman section ended in November 2011. Further west, an 8.3 km (5.2 mi) bypass of Salaberry-de-Valleyfield became Autoroute 530 in 2012 when construction of the A-30 extension was completed.

Northeast of Montreal the autoroute parallels Route 132, bypassing the steelmaking centres of Contrecoeur and Sorel-Tracy.

An 18.3 km super two segment in Bécancour, from Route 132 immediately west to an interchange with Autoroute 55 (near Laviolette Bridge, south of Trois-Rivières). The A-30 parallels the St. Lawrence River, bypassing the communities of Sainte-Angèle-de-Laval and Des Ormeaux and linking the Port of Bécancour to the autoroute network. Multiplexed with Route 132, the A-30 continues as a two-lane road for a short distance further before ending at the western approach to Gentilly. The road continues on as Route 132.

A-30 bridge across the Beauharnois Canal

Construction of this portion of the A-30—from an interchange with the A-15 (and the spur A-930) in Candiac to Châteauguay—began in 2005 and opened to traffic on November 19, 2010.[18] This section was linked to the A-30 mainline in November 2011. Motorists using A-30 can quickly access New York via the A-15 and Interstate 87.

Signage for A-530

A new 35 km (21.7 mi) four-lane divided highway has been constructed, and opened to traffic on December 15, 2012. The A-30 crosses the St. Lawrence River to a redesigned interchange with A-20 and the former A-540. The new river crossing expedites the region's access to Toronto via A-20 and Ontario Highway 401.

A-540, a short spur road connecting A-20 with A-40, was re-designated A-30 once construction was complete. Thus, A-30's ultimate western terminus is at the junction with A-40, providing access to Ottawa and eastern Ontario via Ontario Highway 417.

The re-routing of A-30 across the St. Lawrence River resulted in the re-designation of a 7 km (4.3 mi) long section of the original route as A-530. This spur route links the re-aligned A-30 mainline with Salaberry-de-Valleyfield. A-530 features two interchanges, one at boulevard Pie XII and the other at Route 201.[19]