The original Louis-Hippolyte Lafontasine Tunnel was constructed in 1967, and was in need of significant rehabilitation or replacement in order to make it viable for residents in Montreal. In August 2020, the contract was awarded for the rehabilitation project. Construction work began in 2021 and included: Installation of lane diversions on autoroute 25 for the reconstruction of concrete slabs; Development of preferential measures for public transit, including a westbound widening to add a third lane; Development of three incentive parking lots on the South Shore; Repair of the tunnel service corridor walls; and Work related to preparatory work, such as the installation of louver beams or the construction of a temporary exit that will enter service later as part of the reconstruction of the autoroute 25 roadway.
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