A crash is causing chaos on a major Perth freeway as the afternoon traffic rush begins. A crash is causing chaos on a major Perth freeway as the afternoon traffic rush begins. Credit: Main RoadsA crash caused chaos on a major Perth freeway just as Monday’s afternoon traffic rush began. The collision closed three northbound lanes on the Mitchell Freeway at Narrows Bridge about 3.15pm. The crash was cleared about 30 minutes later but commuters were advised traffic remained heavy on approach.