Quebec Route 9
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| Autoroute Décarie Autoroute des Laurentides |
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| Route information | ||||
| Maintained by Transports Québec | ||||
| Length: | 164.0 km (101.9 mi) | |||
| Existed: | 1958 – present | |||
| Major junctions | ||||
| South end: |
  I-87 / US 9 in Champlain, NY
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  A-30 / A-930 in Candiac  A-10 / A-20 in BrossardA-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
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| North end: |
 Route 117 (TCH) in Sainte-Agathe-des-Monts
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| Location | ||||
| Major cities: | La Prairie, Brossard, Montreal, Laval, Boisbriand, Blainville, Mirabel, Saint-Jérôme | |||
| Highway system | ||||
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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 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.
The southern section of A-15 connects the south shore suburbs of Montreal and is also the primary trade corridor route between Montreal & 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.
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Wikipedia