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This 2006 photo shows the northbound Laurentian Autoroute (A-15) at EXIT 14 (QC 117 / Cure-Labelle Boulevard) in Laval. The concrete-arch overpass in this photo dates back to the autoroute's completion through the area in 1959. (Photo by Laura Siggia Anderson.)

FROM MONTREAL TO THE LAURENTIANS: The Laurentian Autoroute was the first of a province-wide network of expressway envisioned by the Premier Maurice Duplessis in the 1950's. Built under the auspices of the Quebec Autoroute Authority, which financed the highway's construction through bond issuance and toll collection, the autoroute was to relieve congestion along Route 11 (now QC 117) during the summer and winter resort seasons. It also was conceived as part of the northern (Abitibi) route of the Trans-Canada Highway through northwest Quebec and northeast Ontario.

As planned originally, the Laurentian Autoroute was to extend 47 kilometers (29 miles) from the Metropolitan Autoroute (A-40), which was under design at the time, north to QC 117 in St. Jerome. It was planned with two 51-foot-wide roadways, each accommodating three travel lanes (12 feet wide for the right and center lanes and 13 feet wide for the left lane) as well as left and right shoulders; separating the two roadways was a wide grassy median that measured 40 feet on Montreal Island and 100 feet outside Montreal.

To reduce drive fatigue, gentle curves were incorporated into the highway's design, but even with these curves, the design speed throughout the route was 110 km/h (70 MPH). However, the speed limit was set at 100 km/h (60 MPH) upon completion as an added safety measure. (According to some locals, the autoroute has three dangerous curves between Laval and St. Jerome to avoid property condemnation of allies of Duplessis.) Approximately C$1 million per mile was spent on landscaping, which also was done to reduce driver ennui while providing a buffer for adjacent communities.

There were three toll plazas built along the route at Laval (at EXIT 7 / Cartier Boulevard), Boisbriand (at EXIT 19 / QC 344), and Mirabel (just south of EXIT 39 / QC 148), each collecting a 25-cent toll. As the Laurentian Autoroute was extended north, an additional toll plaza was built at Bellefeuille (just south of EXIT 55 / QC 117-Prevost). Evidence of the former toll plazas exists in the form of extended entrance and exit ramps (for ramp tolls) at EXIT 7 and EXIT 19.

THE PROVINCE'S FIRST AUTOROUTE: Construction began in 1957 on the first section of the Laurentian Autoroute from Cremazie Boulevard (which eventually was rebuilt as the Metropolitan Autoroute) north to EXIT 7 in Laval; this included construction of a new bridge over Riviere des Prairies. This seven-kilometer (4.3-mile) long section was opened to traffic on November 15, 1958; it was inaugurated officially 15 days later.

An additional 38-kilometer (23.6-mile) long section was completed from Laval north to EXIT 45 (QC 117) in St. Jerome on September 1, 1959. The northernmost 1.6 kilometers (one mile) of this section connecting to QC 117 in St. Jerome ultimately became an unnumbered spur of A-15 when the Laurentian Autoroute was extended north in 1963.

EXTENDING THE AUTOROUTE: In the first year after the Laurentian Autoroute opened, it carried as many as 35,000 vehicles per day (AADT), but as the resort area became more popular, chronic congestion was pushed further north along Route 11 past the terminus of the autoroute. It became clear that an extension was needed.

In December 1963, the Quebec Autoroutes Authority opened a 24-kilometer (15-mile) long extension from St. Jerome north to EXIT 69 (QC 370 and QC 117) in St. Adele. This section has flanking service areas on the northbound and southbound lanes at kilometer 51 in Bellefeuille. It also featured the first cast-in-place segmental box-girder bridge built in North America. As in St. Jerome, the northernmost one-half kilometer (0.3 mile) of the St. Jerome-St. Adele section became an unnumbered spur of A-15 when the Laurentian Autoroute was extended north in the early 1970's.

The final extension into the Laurentians was completed in 1974, when the Ministere des Transports du Quebec (MTQ) - which had assumed control of the toll agency one year earlier - completed the autoroute north from St. Jerome to EXIT 89 (QC 329 and QC 117) in Ste.-Agathe-des-Monts.

Tolls were collected on the autoroute until 1985, at which time the toll plazas subsequently were dismantled.

LEFT: This 1961 photo shows the Laurentian Autoroute (A-15) at EXIT 8 (QC 148 / St. Martin Boulevard) in Laval. (Photo from the Archives Nationale de Quebec / "Bilan de Siecle," University of Sherbrooke.) RIGHT: This photo from 1968 shows construction of the A-15 extension from St. Jerome north to Ste.-Agathe-des-Monts. (Photo from the Archives de Montréal and the Bibliothèque et Archives Nationales du Québec.)

OVERPASS COLLAPSE IN LAVAL: On June 18, 2000, a new precast girder overpass being built to replace the existing Boulevard du Souvenir overpass in Laval crashed onto the Laurentian Autoroute, killing one motorist and injuring two others. One of the 16 beams of the overpass ruptured, sending all 16 beams of the overpass - each weighing about 90 tons - onto the autoroute. Since the accident occurred early on a Sunday morning, the scope of the tragedy was more limited than the 2006 collapse of the Boulevard de la Concorde overpass over the Papineau Autoroute (A-19) less than five kilometers to the east in Laval. The Laurentian Autoroute was closed for several days between EXIT 7 and EXIT 8 (QC 148 / St. Martin Boulevard) while the debris was cleared and the rest of the overpass was removed.

A company called Beaver Ridge, which was under bankruptcy protection and operated without a construction license for four months, oversaw construction of the Boulevard du Souvenir overpass. Three weeks before the collapse, the Commission de la Sante et de la Securitie du Quebec (CSST) noted workplace irregularities, including communication problems at the site.

In public hearings held after the collapse, an engineer acknowledged he submitted incomplete plans for the project. After three years of studies and hearings, the CSST published a report criticizing Beaver Ridge for structural and security flaws, and called for changes to beam and formwork structures. However, the province cleared Beaver Ridge of any criminal wrongdoing. The CSST also pledged a more thorough investigation of construction sites. In 2003, a new four-lane overpass was completed at the site.

LEFT: This 1959 photo shows the Laval toll plaza near EXIT 7 (Cartier Boulevard). RIGHT: This 1974 photo shows the Laurentian Autoroute near the current EXIT 69 (former EXIT 43) / QC 370 in Ste.-Adele. Note the old-style guide sign with exit numbering based on the imperial system, which likely dates back to the opening of this section in 1963. (Photos from the Archives de Montréal and the Bibliothèque et Archives Nationales du Québec.)

EXPANSION AND CHANGES FOR AN INTERNCHANGE: In later years, an additional travel lane was built in each direction from EXIT 3 (Henri Bourassa Boulevard) in Montreal north to EXIT 14 (QC 117 / Cure-Labelle Boulevard) in Laval. In the early 2000's, a fourth through travel lane was built from EXIT 19 (QC 344 / Grande-Cote Road) in Boisbriand north to EXIT 25 (Boulevard de la Seigneurie) in Blainville at a cost of C$56 million.

In 2006, the Ministere des Transport du Quebec (MTQ) and the Town of Boisbriand announced plans to rebuild EXIT 20 (A-640 / North Belt Autoroute). As early as 2000, the MTQ saw the need to rebuild the interchange, through which approximately 225,000 vehicles per day (AADT) pass, as it is the primary transfer point for North Shore traffic toward Montreal to the south and the Laurentians to the north. The postponement of the A-13 extension toward Mirabel Airport has added to the congestion at the interchange. Work began on the project in mid-2007 and is comprised of the following:

  • new directional flyover ramps to replace some of the cloverleaf ramps

  • new collector-distributor (C/D) roads to separate the local and express traffic flows on A-15 (as there are on A-640 through the interchange)

  • an additional traffic lane in each direction on A-640 between EXIT 20 (A-15) and EXIT 22 (QC 117 / Labelle Boulevard)

The interchange, which is being rebuilt in four stages, is scheduled for completion in 2011. About three-quarters of the interchange's C$95 million cost is being picked up by the province, with the remainder borne by the Town of Boisbriand.

This 2006 photo shows the northbound Laurentian Autoroute (A-15) at EXIT 35 (A-50 / Outaouais Autoroute) in Mirabel. Plans from the 1960's through the early 1980's called for A-50 to extend east of this interchange toward A-40 in Berthierville. (Photo by Laura Siggia Anderson.)

ST. JOVITE BYPASS HINTS AT NORTHERN EXTENSION: From the current end of the Laurentian Autoroute north to Labelle, Route 117 exists as a four-lane divided highway. In recent years, a freeway bypass of Route 117 was built around the resort town of St. Jovite. Exit numbers on the bypass reflect a potential extension of the Laurentian Autoroute, though there are no A-15 shields posted:

  • EXIT 116: QC 327 (Leonard Street)
  • EXIT 117: QC 323 (Brebeuf Road)
  • EXIT 119: Montee Ryan
  • EXIT 126: Tulip Road

The MTQ has not ruled out closing the 27-kilometer (17-mile) gap on the Laurentian Autoroute, through the province does not see an A-15 extension as a priority project at this time.

CONTINUOUS EXIT NUMBERS FOR A-15: To avoid confusion, exit numbers should continue on the Laurentian Autoroute based on the zero kilometer-post on A-15 at the Quebec-New York border. (In this respect, A-15 is like its counterpart in New York State - Interstate 87 - because its exit numbering scheme resets within the province; it is the only autoroute to do so.)

The new exit numbers would be posted as follows (with the old numbers in parentheses):

EXIT 74 (1): A-40 (Metropolitan Autoroute)
EXIT 75 (2): Acadie Boulevard
EXIT 76 (3): Henri-Bourassa Boulevard
EXIT 77 (4): de Salaberry Street
EXIT 80 (7): Boulevard de la Concorde / Notre Dame Boulevard
EXIT 81 (8): QC 148 (St. Martin Boulevard)
EXIT 83 (10): A-440 (Laval Autoroute)
EXIT 87 (14): QC 117 (Cure Labelle Boulevard)
EXIT 89 (16): St. Rose Boulevard
EXIT 92 (19): QC 344 / Boisbriand
EXIT 93 (20): A-640 (North Belt Autoroute)
EXIT 96 (23): Mirabel (St. Augustine) / St. Charles Street
EXIT 98 (25): Blainville / Boulevard de la Seigneurie
EXIT 104 (31): Mirabel / St. Janvier / Ste.-Monique
EXIT 108 (35): A-50 (Outaouais Autoroute)
EXIT 112 (39): QC 158 / Mirabel
EXIT 114 (41): Briere Street
EXIT 116 (43): Martigny Street / St. Jerome / Bellefeuille
EXIT 118 (45): QC 117 Spur (Montee Ste.-Therese)
EXIT 124 (51): Bellefeuille Service Area
EXIT 128 (55): Prevost (to QC 117)
EXIT 130 (57): Ste.-Anne-des-Lacs
EXIT 131 (58): Avila Road / Piedmont
EXIT 133 (60): QC 364 / St. Sauveur
EXIT 137 (64): Mount Gabriel Road
EXIT 140 (67): QC 117 / Ste.-Adele
EXIT 142 (69): QC 370 / Ste.-Adele / Esterel
EXIT 151 (76): QC 117 / Val-Morin / Val-David
EXIT 155 (80): 7th Rang / Val-David
EXIT 158 (83): Montee Alouette
EXIT 161 (86): QC 117 / Ste.-Agathe-des-Monts
EXIT 163 (88): Demontigny Street
EXIT 164 (89): QC 117 and QC 329
Proposed EXIT 182 (107): St. Faustin (Centre-Ville)
EXIT 189 (116): QC 327 (Leonard Street)
EXIT 190 (117): QC 323 (Brebeuf Road)
EXIT 192 (119): Montee Ryan
EXIT 199 (126): Tulip Road (La Concepcion)

NEW DESIGNATION FOR THE ST. JEROME SPUR: The St. Jerome spur from the Laurentian Autoroute should be designated Autoroute 515. The A-515 spur was part of the original autoroute mainline from 1959 until 1963.

SOURCES: "Autoroute to Laurentians" by Charles J. Lazarus, The New York Times (10/19/1958); "An Expressway to the Laurentians" by Charles J. Lazarus, The New York Times (12/07/1958); "Laurentians' Main Street Opened" by Charles J. Lazarus, The New York Times (9/06/1959); "Easing the Way for Skiers" by Charles J. Lazarus, The New York Times (12/01/1963); "An Overpass Collapses on a Car in Laval" by Réjean Léveillé, LCN News (6/18/2000); "Laval Overpass: City Cleared of Responsibility" by Lucie Paquin, LCN News (6/20/2000); A Shared Vision for Action: Planning Framework and Government Orientations, Montreal Metropolitan Region 2001-2021, Ministère des Affaires Municipales et de la Metropole (2001); "CSST Report on Overpass Collapse," CFCF-TV (5/06/2003); "Boulevard du Souvenir Overpass: Lack of Communication Caused Accident," LCN News (5/06/2003); Bridge Engineering: Construction and Maintenance by Wai-Fah Chen and Lian Duan, CRC Press (2003); "Highway 15 and 640 Interchange To Be Revamped" by Nancy Girgis, The North Shore News (4/22/2006); "Echoes of Another Tragedy: du Souvenir Accident Claimed One Life" by Catherine Solyom, The Montreal Gazette (10/01/2006); Genivar, Inc.; Ministère des Transports du Québec; Félix Mathieu-Bégin; Richard Dupuis; Stephane Dumas.

  • A-15 shield by Wikipedia.
  • Laurentian Autoroute shield from MTQ Quebec map (1975).
  • Trans-Canada Highway shield by James Lin.
  • Lightposts by Millerbernd Manufacturing Company.






  • Laurentian Autoroute (A-15)

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