A man has been airlifted to Royal Perth Hospital after he was involved in a serious crash near Keysbrook early Tuesday morning.
The driver, in his 40s, became trapped after his four-wheel drive towing a trailer collided with a tree along South West Highway about 1.45am.
Emergency services had to free the man, whose his legs were trapped in the car.
A St John Ambulance spokeswoman said the man sustained possible leg injuries.
The RAC Rescue helicopter departed the scene with the man about 3am.