1. Highway 19 Overpass

Location: Laval, Quebec

Year of Fail: 2006

A 66-foot section of the De la Concorde overpass in this Montreal suburb gave way in 2006, crushing two vehicles under concrete and causing a third to fall over the edge of the roadway. Five people were killed and six others were seriously injured. Built in 1970, a number of factors contributed to the ’06 collapse: poor initial design, incorrectly placed rebar reinforcement, low quality concrete and a fracture along the horizontal plane that had grown in the years before the catastrophe.