One person has been flown to Royal Perth Hospital by the RAC Rescue Helicopter after a single car crash on Forrest Highway in Binningup.
Emergency services crews rushed to the scene just after 9am and worked quickly to free the driver of the vehicle who was trapped.
The person was treated at the scene by St John Ambulance crews before being loaded onto the helicopter.
The helicopter was set to land at Royal Perth Hospital at 10.30am.
The northbound lanes of Forrest Highway were closed by police for more than an hour with traffic backed up for more than two kilometres.
More to follow.