Quebec Autoroute 15

Autoroute 15 (also called the Décarie Expressway (English) or Autoroute Décarie (French) between the Turcot and Décarie Interchanges in Montreal and the Laurentian Autoroute (English) or Autoroute des Laurentides (French) north of Autoroute 40) is a highway in western Quebec, Canada. It was, until the extension of Autoroute 25 was opened in 2011, the only constructed north-south autoroute to go out of Montreal on both sides. A-15 begins at the end of Interstate 87 at the United States border at Saint-Bernard-de-Lacolle and extends via Montreal to Sainte-Agathe-des-Monts with an eventual continuation beyond Mont-Tremblant. The total length of A-15 is currently 164 km (101.9 mi), including a short concurrency (4 km or 2.5 mi) with Autoroute 40 (Boulevard/Autoroute Métropolitan) that connects the two main sections. This is one of the few autoroutes in Quebec that does not have any spinoff highways.

Autoroute 15
Autoroute Décarie
Autoroute des Laurentides
Route information
Maintained by Transports Québec
Length164.0 km[1][2] (101.9 mi)
Existed1958 [2][3]–present
Major junctions
South end I-87 in Champlain, New York
  A-30 / A-930 in Candiac
A-10 / A-20 in Brossard
A-10 in Montréal
A-20 / A-720 in Montréal
A-40 (TCH) in Montréal
A-440 in Laval
A-640 in Boisbriand
A-50 in Mirabel
North end Route 117 (TCH) in Sainte-Agathe-des-Monts
Major citiesLa Prairie, Brossard, Montreal, Laval, Boisbriand, Blainville, Mirabel, Saint-Jérôme
Highway system

Road description

Southern section

The southern section of A-15 connects the south shore suburbs of Montreal and is also the primary trade corridor route between Montreal and New York City linking Quebec Autoroute 15 to Interstate 87 at the Canada-United States border at the Champlain-St. Bernard de Lacolle Border Crossing. This was the former Route 9, and connected with US 9 on the western shore of Lake Champlain. In Brossard, it joins up with A-10 and A-20 across the Champlain Bridge into Montreal. The A-10 splits off almost immediately after crossing the bridge to head into downtown Montreal at the Bonaventure Expressway and the A-20 splits off shortly after at the Turcot Interchange (échangeur Turcot), leaving the A-15 to continue northward as Autoroute Décarie until the Décarie Interchange (échangeur Décarie) with the A-40 at the point where it turns from the Trans-Canada into the Metropolitan Expressway.

The route is also connected to Autoroute 30 in Candiac which was completed to Autoroute 20 in 2012 providing a quicker access to the south shore of Montreal, to southern communities located alongside Autoroute 15 and to the Canada–US border in Lacolle. It will also give a quicker access from there to areas west of Montreal and also Ottawa and Gatineau.

Décarie Autoroute

The Décarie Autoroute is a sunken highway between the northbound and southbound lanes of Decarie Boulevard from the Metropolitan Autoroute at its northern end to Monkland Avenue and the Villa Maria Metro station at its southern end. It was built on a wide expanse of vacant land, donated to the city by the Décarie estate on the condition that a streetcar line would be established. The decommissioning of the streetcar system in 1959 left the right-of-way as an obvious choice for a highway and so the Décarie Autoroute was dug there. South of Queen Mary Road, however, were a significant number of houses that were demolished.

To avoid demolishing Notre-Dame-de-Grâce Church, the highway makes a slight westerly jog below Côte-Saint-Luc Road and runs through a short tunnel, before emerging between Addington and Botrel Streets and running down to Sherbrooke Street and Saint Jacques Street, where it spectacularly goes from being below the ground to well above the ground as it intersects with Autoroutes 20 and 720 in the infamous Turcot Interchange (dubbed "Spaghetti Junction" by train crews operating the former CN Rail Turcot Yard). Following the conversion from streetcar line to highway, the Décarie estate sued the city but was unable to prevail because its did not document its case well enough for the nevertheless-sympathetic court.

Decarie Boulevard

Decarie Boulevard itself continues; from Monkland Avenue south to Saint Jacques Street past the McGill University Health Centre Glen Campus superhospital; and from Autoroute 40 north into Ville Saint-Laurent past Du College Station and Côte-Vertu Station/Norgate shopping centre to Poirier Street. Between Monkland Avenue and A 40, Decarie Boulevard serves as sort of a service road on both sides of the autoroute.

Northern section

After its concurrency with A-40, the northern section of A-15 is the main freeway route to the Laurentians, or Laurentides, until it downgrades to Route 117. It also links up to the northern suburbs of Montreal, as well as provides a connection to the A-440, A-640 and the A-50 in Mirabel. The first section from A-40 to Saint-Jérôme was opened in 1958 as a toll road, although the tolls were removed in 1985. This section was also the first to be designed as an autoroute in the province. It was named Autoroute Montréal-Laurentides during the 1960s.[4]

Over the next years, it was extended north to Sainte-Agathe-des-Monts as a new connection to touristic and skiing destinations in the Laurentides including in Saint-Sauveur, Sainte-Adèle, Mont-Gabriel and Estérel. In the future, it is possible that the A-15 may continue even farther north, past Mont-Tremblant, as Route 117 is already an at-grade expressway with a freeway bypass of Saint-Jovite completed, and the name Autoroute des Laurentides is also recognized on the freeway bypass (and exit numbers continue). This section is numbered separately from the southern section as if it were a different route. The northern route is also part of the Trans-Canada Highway.

Exit list

Exit numbering resets at the two interchanges with Autoroute 40 in Montréal.

MontérégieSaint-Bernard-de-Lacolle0.000.00 I-87 south (Adirondack Northway) / US 9 south Albany, New YorkContinues into New York
Canada–United States border at Champlain–St. Bernard de Lacolle Border Crossing
1.080.671Montée Glass / Montée GuayAlso signed as a u-turn
6.504.046 Route 202 Hemmingford, Saint-Bernard-de-Lacolle, Lacolle
11.056.8711Montée Henrysburg
13.118.1513Montée MurraySouthbound exit only
20.9112.9921 Route 219 / Route 221 Napierville, SherringtonAlso serves Route 217
Saint-Édouard29.8318.5429Saint-Édouard, Saint-Jacques-le-MineurVia Montée du Moulin
Saint-Mathieu38.1423.7038Saint-Mathieu, Saint-PhilippeVia Montée Monette
Candiac40.7325.3140 A-30 west (Autoroute de l'Acier) Pont Honoré-Mercier, Vaudreuil-DorionExit 55 on A-30; opened December 2010
42.9226.6742 A-30 east / Route 132 west (via A-930) Sorel-Tracy, Québec, Saint-Constant, Sainte-CatherineSouthern terminus of concurrency with Route 132; shared ramp with exit 40 northbound
44Boulevard Montcalm Candiac
45.2828.1445 Route 134 east (Boulevard Taschereau) La PrairieNorthbound exit and southbound entrance; south end of Route 134
La Prairie45.73–
46Boulevard Salaberry La Prairie
47.9529.7947Rue Saint-Henri La PrairieNorthbound exit and entrance
48.6130.2049Rue du QuaiSouthbound exit and entrance; to Parc de la Marina
50Boulevard Matte; Boulevard RivardBoulevard Rivard appears on southbound signage
51Boulevard Rivard; Rue RivieraBoulevard Rivard on northbound signage; Rue Riviera on southbound signage
51.7132.1352Boulevard RomeNo southbound exit
53 A-10 east (Autoroute des Cantons-de-l'Est) to A-30 / I-89 Sherbrooke, Vermont
A-20 east (Autoroute René-Lévesque) / Route 132 east Longueuil, Varennes
A-15 branches west; northern terminus of concurrency with Route 132;
southern terminus of concurrency with A-10 and A-20; exit 6 on A-10
St. Lawrence River54.74–
Pont Champlain
MontrealMontreal57.8735.9657Île de SœursNorthbound exit and entrance
58.4136.2957NChemin de la Pointe-Nord RoadSouthbound exit and entrance
58.6936.4757SBoulevard de l'Île des SoeursSouthbound exit and entrance
57.9035.9858 A-10 west (Autoroute Bonaventure) Centre-VilleNorthern terminus of concurrency with A-10; signed as exit 57O (west) southbound
59.6737.0860 A-10 west (Autoroute Bonaventure) / Rue Wellington Centre-Ville, VerdunNorthbound access to A-10 is via exit 58; exit 4 on A-10
60.7637.7561Rue Saint Patrick / Avenue Atwater
62.0038.5362Boulevard de La Vérendrye / Avenue de l'Église
63.5839.5163 A-20 west (Autoroute du Souvenir) / A-720 east (Autoroute Ville-Marie) Centre-Ville, Aéroport P.-E.-Trudeau, TorontoTurcot Interchange
Northern terminus of concurrency with A-20; signed as exits 63E (east) and 63O (west) southbound; A-20 exit 68; A-720 exit 1
Southern terminus of Autoroute Décarie
64 Rue Sherbrooke (Route 138) / Rue Saint-Jacques
66Chemin Côte-Saint-Luc / Chemin Queen-Mary / Chemin de la Côte-Sainte-Catherine
69Rue Jean-Talon / Rue de la Savane / Avenue Van Horne / Chemin de la Côte-Sainte-Catherine
66[lower-roman 1]
A-40 (TCH) west (Autoroute Félix-Leclerc) to A-520 Aéroport P.-E.-Trudeau, Gatineau, OttawaDécarie Interchange
A-15 branches east; southern terminus of concurrency with of A-40
Boulevard Marcel-Laurin (Route 117 north) / Boulevard DécarieNorthbound exit, southbound entrance
Northern terminus of Autoroute Décarie
71.3544.3368[lower-roman 1]Rue Stinson / Chemin Rockland / Boulevard de L'AcadieNorthbound exit and southbound entrance
73.0045.3670[lower-roman 1]
A-40 (TCH) east (Autoroute Métropolitaine) to Route 335 (Rue Saint-Denis) / Boulevard Saint-Laurent QuébecA-15 branches north; northern terminus of concurrency with A-40
Boulevard Marcel-Laurin (Route 117 north) / Chemin Rockland / Boulevard de L'AcadieSouthbound exit
Southern terminus of Trans-Canada Highway designation and Autoroute des Laurentides
74.2546.142Boulevard de la Côte-Vertu Saint-LaurentSouthbound exit and northbound entrance
Rue Sauvé / Boulevard Henri-Bourassa / Boulevard de L'AcadieNorthbound exit and entrance
75.7347.063Boulevard Henri-BourassaNorthbound exit is via exit 2
77.2247.984Rue de SalaberrySigned as exits 4E (east) and 4O (west) southbound; no southbound entrance
Rivière des Prairies78.02–
Pont Médéric-Martin
7Boulevard Cartier / Boulevard de la Concorde / Boulevard Notre-DameNorthbound entrance and exit via Le Corbusier Boulevard
80.1949.838Boulevard Saint-MartinNo direct southbound exit; southbound exit is via exit 10
10 A-440 (Autoroute Laval) / Boulevard le CarrefourExit 22 on A-440
86.4153.6914 Route 117 (Boulevard Curé Labelle) / Boulevard Dagenais westSigned as exits 14N (north) and 14S (south) southbound
88.4754.9716Boulevard Sainte-Rose / Avenue de la Renaissance
Rivière des Mille Îles89.64–
Gedeon Ouimet Bridge
LaurentidesBoisbriand91.2656.7119 Route 344 Boisbriand, Rosemère
92.8157.6720 A-640 to A-13 Repentigny, Québec, Boisbriand, Saint-Eustache, Sainte-Thérèse, Aéroport P.-E.-TrudeauSigned as exits 20E (east) and 20O (west); exit 20 on A-640
95.6659.4423Rue Saint-Charles Saint-Augustin Centre-Ville Sainte-Thérèse
Blainville97.7560.7425Boulevard de la Seigneurie Blainville
MirabelBlainville101.2062.8828Boulevard Michèle-Bohec / Chemin Notre-Dame Mirabel, Blainville
Mirabel103.3164.1931Saint-Janvier, Sainte-MoniqueVia Rue Charles
107.4266.7535 A-50 to Route 117 (Boulevard Mirabel) Gatineau, Lachute, Aéroport Mirabel, Saint-Jerome, Saint-JanvierExit 282 on A-50
111.5869.3339 Route 158 (Route Sir-Willfrid-Laurier) Saint-Canut, Sainte-Sophie
Saint-Jérôme113.5470.5541Boulevard du Grand-Héron
115.6771.8743Rue De Martigny Ouest Centre-Ville Saint-Jérôme, Saint-Colomban, Mille-IslesSigned as exits 43E (east) and 43O (west)
117.5073.0145 Route 117 / Route 333 / Boulevard de La Salette Prévost, Saint-HippolyteNo direct southbound access to Routes 117 and 333
123.9176.9951Aire de Service La Porte du Nord (service centre)
Prévost126.9578.8855PrévostNorthbound exit and southbound entrance
Sainte-Anne-des-Lacs129.2280.2957 Route 117 Sainte-Anne-des-LacsNo southbound exit
130.5381.1158Chemin Avila PiedmontNo southbound exit or northbound entrance
Saint-Sauveur133.0982.7060 Route 364 Saint-Sauveur, Morin-Heights, Piedmont, Saint-Adolphe-d'Howard
Sainte-Adèle136.6784.9264Chemin du Mont-Gabriel
139.486.667 Route 117 Centre-Ville Sainte-AdèleNorthbound exit and southbound entrance
141.6187.9969 Route 370 (Chemin Pierre-Péladeau) Sainte-Adèle, Sainte-Marguerite-du-Lac-Masson, Estérel
144.4589.7672Chemin du Mont-Sauvage / Montée à Séraphin Sainte-AdèleNorthbound exit and southbound entrance
Val-Morin148.1292.0476 Route 117 Val-Morin, Val-DavidNorthbound exit and southbound entrance
Val-David152.2794.6280Val-David, 7e RangNorthbound exit and southbound entrance
Sainte-Agathe-des-Monts155.6596.7283 Route 329 south / Montée Alouette Saint-Adolphe-d'HowardNorthbound exit and southbound entrance
158.5598.5286 Route 117 Centre-Ville Sainte-Agathe-des-Monts
160.1799.5388Rue DemontignyNorthbound exit and southbound entrance
162.00100.6689 Route 117 south (Boulevard Morin) / Route 329 Saint-Donat, LanaudièreNorthbound exit and southbound entrance
164.00101.90 Route 117 (TCH) north (Route Transcanadienne)Trans-Canada Highway follows Route 117 north
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


On June 18, 2000, the southern portion of the Boulevard du Souvenir overpass in Laval (which crosses over Quebec Autoroute 15), under reconstruction, collapsed into the roadway, killing one and injuring two when cars were crushed underneath the structure. Sixteen beams weighing about 70 tonnes (69 long tons; 77 short tons) each fell. The contractor was faulted for shoddy work. The arched concrete beams were unsecured and tipped over like dominoes, many of them breaking into pieces.

The expressway has also seen flooding. On July 14, 1987, a sudden torrential downpour caused by an HP supercell thunderstorm dumped over 100 millimetres (3.9 inches) of rain in just over one hour across the city. The Décarie Expressway, which is below-grade, was heavily flooded and became a river. At some locations, the water reached a maximum of 3.6 metres (12 feet) in depth on the roadway. Over 300 vehicles were abandoned when they were submerged. Two people were killed by the storm.[5] One 80-year-old man on the Expressway drowned and another one was killed by electrical wires (electrocuted). On July 5, 2005, another torrential downpour flooded portions of the Expressway after several manhole covers blew open from the storm sewers below them being overloaded.[6]

See also


  1. A-40 exit number


  1. Ministère des transports, "Distances routières", page (?), Les Publications du Québec, 2005
  2. "Répertoire des autoroutes du Québec" (in French). Transports Québec. Archived from the original on 2010-01-11. Retrieved 2008-02-23.
  3. 1958 Archived 2006-04-27 at the Wayback Machine
  4. Autoroute Montréal-Laurentides Archived 2006-04-27 at the Wayback Machine
  5. Environment Canada - Water - Main page Archived 2007-01-25 at the Wayback Machine
  6. Canoe – Infos – Québec-Canada: 30 millimètres d’eau en deux minutes sur l’autoroute Décarie

KML is from Wikidata
Preceded by
Route 117
Trans-Canada Highway
Autoroute 15
Succeeded by
Autoroute 40
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