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Autoroute 15
Route Transcanadienne
Autoroute Décarie Autoroute des Laurentides
Route information
Maintained byTransports Québec
Length	164 km[1][2] (102 mi)
Existed	1958[2][3]–present
Major junctions
South end	I-87 inSaint-Bernard-de-Lacolle
Major intersections	A-30 /A-930 inCandiac A-10 /A-20 inBrossard A-10 inMontréal A-20 /R-136 in Montréal A-40 (TCH) in Montréal A-440 inLaval A-640 inBoisbriand A-50 inMirabel
North end	R-117 (TCH) inSainte-Agathe-des-Monts
Location
Country	Canada
Province	Quebec
Major cities	Brossard,Montreal,Laval,Blainville,Saint-Jérôme
Highway system
Trans-Canada Highway Quebec provincial highways Autoroutes List Former
←A-13 →A-19

Autoroute 15 is ahighway in westernQuebec, Canada. It is also called theDécarie Expressway (English) orAutoroute Décarie (French) between theTurcot andDécarie Interchanges inMontreal and theLaurentian Autoroute (English) orAutoroute des Laurentides (French) north ofAutoroute 40. It was, until the extension ofAutoroute 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 ofInterstate 87 at theUnited States border atSaint-Bernard-de-Lacolle and extends via Montreal toSainte-Agathe-des-Monts with an eventual continuation beyondMont-Tremblant. The total length of A-15 is 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.

The southern section of A-15 connects thesouth shore suburbs ofMontreal and is also the primary trade corridor route between Montreal andNew York City linking Quebec Autoroute 15 toInterstate 87 at the Canada-United States border at theChamplain-St. Bernard de Lacolle Border Crossing. This was the formerRoute 9, and connected withUS 9 on the western shore ofLake Champlain. InBrossard, it joins up withA-10 andA-20 across theChamplain Bridge into Montreal. The A-10 splits off almost immediately after crossing the bridge to head into downtown Montreal at theBonaventure Expressway and the A-20 splits off shortly after at theTurcot Interchange (échangeur Turcot), leaving the A-15 to continue northward as Autoroute Décarie until theDécarie Interchange (échangeur Décarie) with the A-40 at the point where it turns from theTrans-Canada into the Metropolitan Expressway.

The route is also connected toAutoroute 30 inCandiac which was completed toAutoroute 20 in 2012 providing quick access to the south shore of Montreal, to southern communities located alongside Autoroute 15 and to theCanada–US border inLacolle. It will also give quicker access from there to areas west of Montreal and alsoOttawa andGatineau.

The Décarie Autoroute is asunken highway between the northbound and southbound lanes of Decarie Boulevard from theMetropolitan Autoroute at its northern end toMonkland Avenue and theVilla 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 ofQueen Mary Road, however, a significant number of houses were demolished.

To avoid demolishing Notre-Dame-de-Grâce Church, the highway makes a slight westerly jog belowCôte-Saint-Luc Road and runs through a shorttunnel, before emerging between Addington and Botrel Streets and running down toSherbrooke Street andSaint Jacques Street, where it spectacularly goes from being below the ground to well above the ground as it intersects withAutoroute 20 andRoute 136 in the infamousTurcot Interchange (dubbed "Spaghetti Junction" by train crews operating the former CN Rail Turcot Yard). Following the conversion from streetcar line to the highway, the Décarie estate sued the city but was unable to prevail because it did not document its case well enough for the nevertheless sympathetic court.

Décarie Boulevard itself continues; fromMonkland Avenue south to Saint Jacques Street past theMcGill University Health Centre Glen Campus superhospital; and fromAutoroute 40 north intoMontreal pastDu College Station andCôte-Vertu Station/Norgate shopping centre to Poirier Street. Between Monkland Avenue andA 40, Décarie Boulevard serves as sort of a service road on both sides of the autoroute.

After its concurrency withA-40, the northern section of A-15 is the main highway route to theLaurentian Mountains orLaurentides, until it downgrades toRoute 117. It also links up to the northern suburbs of Montreal, as well as provides a connection to theA-440,A-640 and theA-50 inMirabel. The first section from A-40 toSaint-Jérôme was opened on August 29, 1959 (source Montreal Star Aug. 29, 1959, page 3) 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 inSaint-Sauveur,Sainte-Adèle andEstérel. In the future, it is possible that the A-15 may continue even farther north, pastMont-Tremblant, as Route 117 is already an at-grade expressway with a freeway bypass of Mont-Tremblant completed, and the nameAutoroute 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 theTrans-Canada Highway.

Exit numbering resets at the two interchanges withAutoroute 40 inMontréal.

RCM	Location	km	mi	Exit	Destinations	Notes
Les Jardins-de-Napierville	Saint-Bernard-de-Lacolle	0.00	0.00	–	I-87 south (Adirondack Northway) toUS 9 south –Albany,New York	Continues intoNew York
				Canada–United States border atChamplain–St. Bernard de Lacolle Border Crossing
		0.3	0.19	–	Chemin Ridge / Chemin Guay	Intersection with stop signs; U-turn possible; no southbound entrance from Chemin Ridge
		1.08	0.67	1	Montée Glass / Montée Guay	Also signed as au-turn
		3.73	2.32	Jardins-de-Napierville Rest Stop (Northbound) - 24 hours with rest rooms
		6.50	4.04	6	R-202 –Hemmingford,Saint-Bernard-de-Lacolle,Lacolle
		11.05	6.87	11	Montée Henrysburg
	13.11	8.15	13	Montée Murray	Southbound exit only
Saint-Patrice-de-Sherrington– Saint-Jacques-le-Mineur	20.91	12.99	21	R-219 /R-221 –Napierville,Saint-Patrice-de-Sherrington	Also servesR-217
Roussillon	Saint-Édouard	29.83	18.54	29	Saint-Édouard,Saint-Jacques-le-Mineur	Via Montée du Moulin
	Saint-Mathieu	38.14	23.70	38	Saint-Mathieu,Saint-Philippe	Via Montée Monette
	Candiac	40.73	25.31	40	A-30 west (Autoroute de l'Acier) –Pont Honoré-Mercier,Vaudreuil-Dorion	Exit 55 on A-30; opened December 2010
		42.92	26.67	42	A-930 east toA-30 east /R-132 west –Sorel-Tracy,Québec,Saint-Constant,Sainte-Catherine	South end of R-132concurrency; shared ramp with exit 40 northbound
		45.08– 45.73	28.01– 28.42	44	Boulevard Montcalm –Candiac
		45.28	28.14	45	R-134 east (Boulevard Taschereau) –La Prairie	Northbound exit and southbound entrance; R-134 southern terminus
	La Prairie	45.73– 47.29	28.42– 29.38	46	Boulevard Salaberry –La Prairie
		47.95	29.79	47	Rue Saint-Henri –La Prairie	Northbound exit and entrance
		48.61	30.20	49	Rue du Quai	Southbound exit and entrance; to Parc de la Marina
Longueuil	Brossard	49.83– 51.20	30.96– 31.81	50	Boulevard Matte; Boulevard Rivard	Boulevard Rivard appears on southbound signage
		50.71– 52.27	31.51– 32.48	51	Boulevard Rivard; Rue Riviera	Boulevard Rivard on northbound signage; Rue Riviera on southbound signage
		51.71	32.13	52	Boulevard Rome	No southbound exit
		52.91– 54.06	32.88– 33.59	53 6	A-10 east (Autoroute des Cantons-de-l'Est) toA-30 /I-89 –Sherbrooke,Vermont A-20 east (Autoroute René-Lévesque) /R-132 east –Longueuil,Varennes	North end of R-132 concurrency; south end A-10 / A-20 concurrency; northbound signed as exit 53; southbound signed as exit 6; A-10 exit 6; A-20 west exit 75
St. Lawrence River		54.74– 57.62	34.01– 35.80	Pont Champlain
Montréal	Montréal	57.90– 58.41	35.98– 36.29	57	Boulevard deÎle des Sœurs, Chemin de la Pointe Nord	Southbound exit and northbound entrance; signed as 57S forÎle des Sœurs and 57N for Chemin de la Pointe Nord
				58	A-10 west –Montreal Centre-ville,Île des Sœurs	Northbound exit and southbound entrance; west end of A-10 concurrency; A-10 exit 5
		71.8	44.6	60	ToA-10 west / Boulevard Gaétan-Laberge,Rue Wellington –Montreal Centre-ville	A-10 exit 4; southbound access to A-10 west (unsigned)
		60.76	37.75	61	Rue Saint Patrick /Avenue Atwater
		62.00	38.53	62	Boulevard de La Vérendrye / Avenue de l'Église
		63.58	39.51	63	A-20 west (Autoroute du Souvenir) /R-136 east (Autoroute Ville-Marie) –Centre-Ville,Aéroport P.-E.-Trudeau,Toronto	Turcot Interchange Northern terminus of concurrency with A-20; signed as exits 63E (east) and 63O (west) southbound; A-20 exit 68; R-136 exit 1
				Southern terminus of Autoroute Décarie
		64.27– 65.02	39.94– 40.40	64	Rue Sherbrooke (R-138) /Rue Saint-Jacques
		65.38– 67.24	40.63– 41.78	66	Chemin Côte-Saint-Luc / Chemin Queen-Mary / Chemin de la Côte-Sainte-Catherine
		68.32– 69.34	42.45– 43.09	69	Rue Jean-Talon / Rue de la Savane / Avenue Van Horne / Chemin de la Côte-Sainte-Catherine
		70.50	43.81	70 66[i]	A-40 (TCH) west (Autoroute Félix-Leclerc) toA-520 –Aéroport P.-E.-Trudeau,Gatineau,Ottawa	Décarie Interchange A-15 branches east; southern terminus of concurrency with of A-40
					Boulevard Marcel-Laurin (R-117 north) /Boulevard Décarie	Northbound exit, southbound entrance
				Northern terminus of Autoroute Décarie
		71.35	44.33	68[i]	Rue Stinson / Chemin Rockland / Boulevard de L'Acadie	Northbound exit and southbound entrance
		73.00	45.36	70[i] 1	A-40 (TCH) east (Autoroute Métropolitaine) toR-335 (Rue Saint-Denis) /Boulevard Saint-Laurent –Québec	A-15 branches north; northern terminus of concurrency with A-40
					Boulevard Marcel-Laurin (R-117 north) / Chemin Rockland / Boulevard de L'Acadie	Southbound exit
				Southern terminus ofTrans-Canada Highway designation and Autoroute des Laurentides
		74.25	46.14	2	Boulevard de la Côte-Vertu / Boulevard Lebeau	Southbound exit and northbound entrance
					Rue Sauvé /Boulevard Henri-Bourassa / Boulevard de L'Acadie	Northbound exit and entrance
		75.73	47.06	3	Boulevard Henri-Bourassa	Northbound exit is via exit 2
		77.22	47.98	4	Rue de Salaberry	Signed as exits 4E (east) and 4O (west) southbound; no southbound entrance
Rivière des Prairies		78.02– 78.30	48.48– 48.65	Pont Médéric-Martin
Laval		79.05– 81.10	49.12– 50.39	7	Boulevard Cartier / Boulevard de la Concorde / Boulevard Notre-Dame	Northbound entrance and exit via Le Corbusier Boulevard
		80.19	49.83	8	Boulevard Saint-Martin	No direct southbound exit; southbound exit is via exit 10; formerR-148
		81.93– 84.13	50.91– 52.28	10	A-440 (Autoroute Jean-Noël-Lavoie) / Boulevard le Carrefour	Exit 22 on A-440
		86.41	53.69	14	R-117 (Boulevard Curé Labelle) / Boulevard Dagenais west	Signed as exits 14N (north) and 14S (south) southbound
		88.47	54.97	16	Boulevard Sainte-Rose / Avenue de la Renaissance
Rivière des Mille Îles		89.64– 90.64	55.70– 56.32	Gedeon Ouimet Bridge [fr]
Thérèse-De Blainville	Boisbriand	91.26	56.71	19	R-344 –Boisbriand,Rosemère
	Boisbriand– Sainte-Thérèse	92.81	57.67	20	A-640 toA-13 –Repentigny,Québec,Boisbriand,Saint-Eustache,Sainte-Thérèse,Aéroport P.-E.-Trudeau	Signed as exits 20E (east) and 20O (west); exit 20 on A-640
		95.66	59.44	23	Rue Saint-Charles –Mirabel,Centre-Ville Sainte-Thérèse
	Blainville	97.75	60.74	25	Boulevard de la Seigneurie –Blainville
	Mirabel–Blainville	101.20	62.88	28	Boulevard Michèle-Bohec / Chemin Notre-Dame –Mirabel,Blainville
Mirabel		103.31	64.19	31	Rue Charles / Montée Sainte-Marianne
		107.42	66.75	35	A-50 toR-117 (Boulevard Mirabel) –Gatineau,Lachute,Aéroport Mirabel,Saint-Jerome	Exit 292 on A-50
		111.58	69.33	39	R-158 / Route-Sir-Wilfrid-Laurier –Sainte-Sophie
La Rivière-du-Nord	Saint-Jérôme	113.54	70.55	41	Boulevard du Grand-Héron
		115.67	71.87	43	Rue De Martigny Ouest –Centre-Ville Saint-Jérôme,Saint-Colomban,Mille-Isles	Signed as exits 43E (east) and 43O (west)
		117.50	73.01	45	R-117 /R-333 / Boulevard de La Salette –Prévost,Saint-Hippolyte	Unsigned A-915; No direct southbound access to R-117 and R-333
		123.91	76.99	51	La Porte-du-NordService Centre	Accessible in both directions
Les Pays-d'en-Haut	Prévost	126.95	78.88	55	Prévost	Northbound exit and southbound entrance
	Sainte-Anne-des-Lacs	129.22	80.29	57	R-117 –Sainte-Anne-des-Lacs	No southbound exit
		130.53	81.11	58	Chemin Avila –Piedmont	No southbound exit or northbound entrance
	Saint-Sauveur	133.09	82.70	60	R-364 –Saint-Sauveur,Morin-Heights,Piedmont,Saint-Adolphe-d'Howard
	Sainte-Adèle	136.67	84.92	64	Chemin du Mont-Gabriel
		139.4	86.6	67	R-117 –Centre-Ville Sainte-Adèle	Northbound exit and southbound entrance
		141.61	87.99	69	R-370 (Chemin Pierre-Péladeau) –Sainte-Adèle,Sainte-Marguerite-du-Lac-Masson,Estérel
		144.45	89.76	72	Chemin du Mont-Sauvage / Montée à Séraphin –Sainte-Adèle	Northbound exit and southbound entrance
Les Laurentides	Val-Morin	148.12	92.04	76	R-117 –Val-Morin,Val-David	Northbound exit and southbound entrance
	Val-David	152.27	94.62	80	Val-David, 7e Rang	Northbound exit and southbound entrance
	Sainte-Agathe-des-Monts	155.65	96.72	83	R-329 south / Montée Alouette –Saint-Adolphe-d'Howard	Northbound exit and southbound entrance
		158.55	98.52	86	R-117 –Centre-Ville Sainte-Agathe-des-Monts
		160.17	99.53	88	Rue Demontigny	Northbound exit and southbound entrance
		161.93– 162.98	100.62– 101.27	89	R-117 south (Boulevard Morin) /R-329 –Saint-Donat
				–	R-117 (TCH) north (Route Transcanadienne) –Mont-Tremblant	A-15 northern terminus; roadway andTrans-Canada Highway follows R-117 north
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus       Incomplete access       Route transition

On February 19, 2020, white-out conditions caused a pile-up involving more than 200 vehicles inLa Prairie, a suburb ofMontreal.^[5] Two people died and more than 70 were injured.

On June 18, 2000, the southern portion of theBoulevard 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 archedconcretebeams were unsecured and tipped over likedominoes, many of them breaking into pieces.

The expressway has also seen flooding. On July 14, 1987, a sudden torrential downpour caused by an HPsupercellthunderstorm 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.^[6] One 80-year-old man on the Expressway drowned and another one was killed byelectrical 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.^[7]

• Décarie Boulevard
• Gibeau Orange Julep

Wikimedia Commons has media related toQuebec Autoroute 15.

• A-15 at motorways-exits.comArchived 2023-03-31 at theWayback Machine
• A-15 at Quebec AutoroutesArchived 2014-12-22 at theWayback Machine
• Steve Anderson's MontrealRoads.com: Decarie Autoroute (A-15)Archived 2010-05-29 at theWayback Machine
• Steve Anderson's MontrealRoads.com: Laurentian Autoroute (A-15)Archived 2008-03-31 at theWayback Machine
• Transports Quebec MapArchived 2013-05-20 at theWayback Machine

Wikinews has related news:

• Highway overpass collapses near Montreal

Trans-Canada Highway
Previous route Route 117	Autoroute 15	Next route Autoroute 40

• Quebec Autoroutes
• Trans-Canada Highway
• Roads in Laval, Quebec
• Roads in Montreal
• Verdun, Quebec
• Transport in Brossard
• Former toll roads in Canada

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