Here’s what to look out for: Highway 15 From Friday at 10 p.m. to Monday at 5 a.m., Highway 15 North will be inaccessible between the Nuns’ Island/Highway 10 exit (58) and the Turcot Interchange. At the same time, work on the Réseau express métropolitain will close Île-des-Soeurs Blvd. and de la Pointe Nord Rd. underneath the highway, and north of it until the Bell campus. Highway exits for roads under the highway will be closed. Mercier bridge Continuing repair work will close the western span of the Honoré-Mercier Bridge from Friday at 10 p.m. to Monday at 5 a.m., so the remaining span will have one lane of traffic in each direction.