Traffic chaos unfolded across Perth on Friday morning after multiple crashes caused lengthy delays. Traffic chaos unfolded across Perth on Friday morning after multiple crashes caused lengthy delays. Credit: Main Roads WATraffic chaos unfolded across Perth on Friday morning after multiple crashes caused lengthy delays. Amid the spate of crashes, motorists have also been urged to drive to the conditions as wet and foggy weather hits Perth. Roads remain wet after just over 2mm of rainfall poured over the metropolitan area overnight, and parts of Perth have experienced low visibility from fog.