Louis-Hippolyte-La Fontaine Tunnel repair work
Until the end of 2026, the Ministère des Transports du Québec (MTQ) is overhauling the Louis-Hippolyte-La Fontaine Tunnel in order to extend its lifespan for another 40 years without requiring further major renovations.
Discover the various measures in place to help you commute during the repair work.
Travel alternatives during repair work
Locate your municipality of departure or destination to find the best travel alternative.
Beloeil/Sainte-Julie – Montreal (Radisson terminal)
Varennes – Montreal (Radisson terminus)
Mont-Saint-Hilaire – Montreal
Longue-Pointe neighbourhood in Montreal
Frequently asked questions about the measures
The mitigation measures for repair work on the Louis-Hippolyte-La Fontaine Tunnel started on the A-20 on December 13, 2021, and will remain in place throughout the duration of the work.
Repairs began in summer 2021 and will continue until 2026.
Note: the major closures end in 2025.
This is the duration determined by the MTQ.
The work began in summer 2021: detours, night and weekend closures on the A-20, minor closures of the local network and occasional weekend closures of the tunnel have affected South Shore traffic.
From 2022 to 2025, you can expect significant impacts on both northbound and southbound traffic.
To follow the progress of the work and find out about upcoming closures, visit the website dedicated to the project.
Repair work on the Louis-Hippolyte-La Fontaine Tunnel will affect the following sectors: exo Sainte-Julie (routes 325, 330, 340, 350 and 600), exo Vallée-du-Richelieu (routes 201 and 300) and exo Sorel-Varennes (routes 709, 710 and 722).
While the work may cause delays, the mitigation measures established by the ARTM and carried out by exo will allow us to limit impacts on passengers.
These lines are free for the duration of the work.
Routes 520, 521 and 532 only run Monday to Friday, as decided by the ARTM, following a thorough analysis of anticipated needs.
As an alternative to driving on weekends, you may use the following bus routes:
As a public transit agency, exo is responsible for executing the mitigation measures established by the ARTM.
Exo will continue to study ridership data to determine if additional mitigation measures are necessary. If need be, we will propose new services to the ARTM, the agency responsible for establishing the necessary mitigation measures.
Need more information?
Visit their website
Visit the website dedicated to the Louis-Hippolyte-La Fontaine Tunnel Major work.