Drivers travelling on Autoroute 640 in Quebec are being urged to pay close attention to current traffic conditions, with an accident, roadway restrictions and a reduced clearance warning affecting travel.
According to Québec 511, two of the three eastbound lanes on A-640 near boulevard de la Grande-Allée in Boisbriand are closed because of an accident. The restriction was reported on September 3, 2026, and is listed as a major traffic hindrance. Motorists approaching the area should expect delays and exercise caution around emergency and response crews.
The Québec 511 system provides motorists with information on roadway conditions, visibility, accidents, roadwork, closures and other traffic disruptions across the province. Conditions can change quickly as incidents are cleared or additional work begins.
Another important warning concerns the Louis-Hippolyte-La Fontaine Tunnel, where the available clearance height has been reduced to 4.3 metres. Québec 511 specifically warns recreational-vehicle operators to confirm their vehicle complies with the reduced height before including the tunnel in their route.
The restrictions come as Quebec prepares for increased travel associated with the Labour Day long weekend. Québec 511 has warned of major disruptions at the Louis-Hippolyte-La Fontaine Tunnel from Friday, September 4, through Tuesday morning, September 8, with scheduled closures in both directions and the Jacques-Cartier Bridge identified as a detour.
For motorists using Autoroute 640, checking Québec 511 immediately before departure is advisable, particularly for anyone travelling through Boisbriand or connecting toward the Montreal area.
Drivers should slow down near work zones and collision scenes, follow posted signs and obey directions from police, transportation officials and emergency crews. Large vehicles and recreational vehicles should also verify clearance restrictions before entering affected routes.
As traffic conditions remain subject to change, motorists are encouraged to allow additional travel time and consider alternate routes where practical.