Due to traffic hindrances caused by the numerous road construction sites in Downtown Montreal, the Société de transport de Montréal (STM) was expecting traffic conditions to deteriorate on Robert-Bourassa Boulevard, which is the primary southern access point to Montreal’s business district. The STM and the City of Montreal considered implementing a 24/24 operational reserved lane on northbound Robert-Bourassa Boulevard, between Saint-Paul and Belmont streets, therefore extending the existing section that runs between Wellington and Saint-Paul streets. Early in 2020, CIMA+ was tasked with evaluating the impacts the implementation of a reserved lane would have on traffic. Carried out over a very short period of time, this project enabled the STM to roll out the recommended measures as early as September 7, 2020.