A man was rushed to hospital with serious injuries after a crash in Clarkson this morning.
His car left the road and hit a tree near the corner of Hester Avenue and Ridgewood Boulevard just after 6am.
Police advised motorists to avoid Hester Avenue eastbound because of the congestion.
St John Ambulance paramedics rushed the man to Joondalup Health Campus.
Anyone with information is asked to call Crime Stoppers on 1800 333 000.