Baldivis crash: Major crash probe after Kia towing caravan crashes on Kwinana Freeway

The Kwinana Freeway has been thrown into chaos after firefighters cut free an elderly woman involved in a serious crash on Sunday morning.

WA Police major crash officers are probing the circumstances of the incident after a red Kia Sorrento SUV, which was towing a caravan, crashed and veered off the Kwinana Freeway southbound, near Karnup Road, around 10.35am.

A Department of Fire and Emergency Services spokesman said crews responded to a car rollover before a 72-year-old woman had to be cut from the Kia using hydraulic tools.

She was transferred to Royal Perth Hospital with serious injuries after being freed around 11.45pm.

Police say a 77-year-old man behind the wheel of the car was uninjured.

Traffic was backed up just before Safety Bay Road by 2.30pm — more than four hours after the incident.

The left lane of the Kwinana Freeway southbound was closed before reopening just before 3pm.

Anyone who witnessed the crash, or who was driving in the area at the time of the incident, is urged to contact crime stoppers on 1800 333 000 or online.

Dash-cam or mobile phone footage can be uploaded to investigators here.