MAJOR Crash officers are investigating a serious crash near Pinjarra on Monday, April 22.
A silver Hyundai I30 hatchback and a black Kawasaki Motorcycle were both travelling north on South Western Highway, between Pinjarra and North Dandalup, at about 2pm.
The Hyundai has made a U-turn in front of the motorcycle, resulting in a collision.
The 76-year-old male rider of the Motorcycle was airlifted to Royal Perth Hospital with serious leg injuries.
The female driver of the Hyundai was not injured.
Major Crash investigators are seeking witnesses who may have seen the Hyundai hatchback or the Kawasaki motorcycle in the area before the crash, or who have dashcam footage from the area. Call Crime Stoppers on 1800 333 000.