 In July 2007, incidentally just weeks before the I-35W Mississippi River bridge collapse, the Quebec department of transports issued a list of 135 overpasses that were considered potentially unsafe.These overpasses were put under close scrutiny and closed to all overweight trucks (in excess of 20 tonnes).Also, the City of Montreal issued a list of a few overpasses under its own responsibility, citing that those were also under close scrutiny and closed to overweight traffic.