The city of Montreal is working to mitigate potentially chaotic traffic congestion after a concrete beam collapsed onto a busy thoroughfare near the city’s downtown core. The incident occurred early Sunday morning when the beam fell from an overpass onto the eastbound lanes of the Ville Marie Expressway. No one was hurt. Montreal’s transit authority, the Société de transport de Montréal, has increased bus service to downtown and the west side of Montreal Island. The city has also suggested alternative routes for drivers coming into the downtown core from the surrounding areas. Parking is prohibited on swaths of streets like St. Antoine St., René Levesque Blvd. and Ontario St. until the Ville Marie Expressway is reopened.