UPDATE: Traffic is flowing again after an earlier multi-car crash caused chaos on the Mitchell Freeway.
There were long queues on the freeway southbound prior to Hutton Street after four cars collided just before 7am on Monday.
Two lanes blocked while tow trucks took the cars involved away and emergency services cleared debris have now fully reopened.
No injuries were reported from the pile-up.
Main Roads WA tweeted the crash, warning motorists to take caution when driving through the area.