Autoroute 20

Autoroute 20 is a major east–west autoroute and a key component of the Trans-Canada Highway system within the province of Quebec. Stretching approximately 585 kilometres from the Ontario border to Rimouski on the south shore of the St. Lawrence River, it serves as a vital transportation corridor linking Montréal, Québec City, and numerous regional centres. The highway is officially designated as the Autoroute Jean-Lesage, named for the former Premier of Quebec who championed its development during the Quiet Revolution.

Route description

From its western terminus at the Ontario border near Rivière-Beaudette, the autoroute travels northeast, skirting the southern edge of Montréal Island through the Montérégie region. It crosses the Honoré Mercier Bridge over the St. Lawrence River into the Montréal borough of LaSalle, where it becomes a central urban freeway. Through Montréal, it runs concurrently with Autoroute 40 and Autoroute 15 at the complex Turcot Interchange, a major junction near the Victoria Bridge. East of the Louis-Hippolyte Lafontaine Bridge–Tunnel, which connects Montréal to Longueuil on the South Shore, the highway assumes its primary alignment along the river's southern bank. It passes through the agricultural regions of Montérégie and Centre-du-Québec, serving cities like Saint-Hyacinthe and Drummondville, before reaching the Mauricie region and Trois-Rivières. The route continues northeast through Chaudière-Appalaches, bypassing Québec City via the Pierre Laporte Bridge and running through Lévis. Its final segment traverses the Bas-Saint-Laurent region, following the river past Rivière-du-Loup before ending in Rimouski. The highway's landscape transitions from urban intensity to flat farmland and eventually to the more rugged, forested terrain of eastern Quebec.

History

The initial planning for a high-speed roadway along the south shore of the St. Lawrence River began in the late 1950s under the government of Premier Maurice Duplessis. Construction accelerated significantly during the tenure of Jean Lesage and his Minister of Roads, Antonio Barrette, as part of a broader modernization of Quebec's infrastructure. The first section, opening in 1964, connected Lévis to Saint-Henri-de-Lévis. The critical Louis-Hippolyte Lafontaine Bridge–Tunnel was inaugurated in 1967, coinciding with Expo 67, to link Montréal with the South Shore. Throughout the 1970s and 1980s, segments were extended both westward toward the Ontario border and eastward toward Rivière-du-Loup. The final leg to Rimouski was completed in the early 1990s, fully realizing the vision of a continuous autoroute. In 1994, the highway was officially renamed in honor of Jean Lesage by the government of Premier Daniel Johnson Jr.. Major reconstruction projects, such as the overhaul of the Turcot Interchange in Montréal beginning in 2015, have continued to modernize this essential artery.

Major intersections

From west to east, Autoroute 20 intersects with numerous other significant transportation routes. At the Ontario border, it connects with Highway 401 via Highway 2. Key junctions in the Montréal area include the interchange with Autoroute 30 (the South Shore bypass) in Vaudreuil-Dorion, the confluence with Autoroute 15 and Autoroute 40 at the Turcot Interchange, and the interchange with Autoroute 25 near the Louis-Hippolyte Lafontaine Bridge–Tunnel. East of Montréal, it meets Autoroute 55 (providing a link to the United States via Sherbrooke) in Drummondville and Autoroute 55 again in Trois-Rivières. In the Québec City region, it interchanges with Autoroute 73 and Autoroute 740 in Lévis near the Pierre Laporte Bridge. Further east, it intersects with Autoroute 85 (the route to Edmundston and New Brunswick) in Rivière-du-Loup. The highway also has important junctions with major Quebec provincial routes like Quebec Route 132, which it parallels for much of its length, and Quebec Route 185.

Exit list

The exit numbering system for Autoroute 20 begins at 1 near the Ontario border and increases eastward, with major exits corresponding to key destinations and intersecting routes. Notable exits include Exit 4 for Coteau-du-Lac, Exit 28 for Autoroute 30 in Vaudreuil-Dorion, and Exit 49 for the Île-des-Sœurs bridge. Through Montréal, exits serve boroughs like LaSalle (Exit 60) and Ville-Marie (Exit 64 near the Turcot Interchange). On the South Shore, critical exits include Exit 87 for Autoroute 25 in Longueuil and Exit 99 for Boucherville. In the Centre-du-Québec region, Exit 145 serves Saint-Hyacinthe and Exit 177 serves Drummondville and Autoroute 55. The Trois-Rivières area is served by exits 206, 210, and 214. Near Québec City, Exit 310 provides access to the Pierre Laporte Bridge and Autoroute 73. Eastern exits include Exit 378 for La Pocatière, Exit 447 for Rivière-du-Loup and Autoroute 85, and Exit 500 for Trois-Pistoles. The highway terminates at Exit 566 in Rimouski, where it transitions into Quebec Route 132. Category:Transportation in Quebec Category:Trans-Canada Highway