POLICE are seeking the driver of a four-wheel-drive whose U-turn at Doyalson on Sunday allegedly triggered a string of collisions which left one driver with a suspected broken arm.
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About 6.45pm, the 4WD was travelling west on the slip lane entering the Doyalson Motorway Link Road from the Tooheys Road Overpass.
The 4WD allegedly performed a U-turn across the raised concrete median strip, before driving over the strip in an attempt to travel east.
A man driving a Ford Ranger and towing a trailer carrying two motorcycles braked heavily to avoid colliding with the 4WD, but the trailer jack-knifed over the median strip and struck a Mitsubishi Lancer driven by a 28-year-old man.
Police were told the motorcycles in the trailer were ejected and hit the roof of the Mitsubishi.
A 45-year-old woman driving west in a Toyota Camry then braked heavily to avoid the cars, before striking the Ford and Mitsubishi.
The driver of the 4WD allegedly failed to stop and continued driving east on the Doyalson Motorway Link Road, police said.
Police and emergency services attended the scene.
The Doyalson Motorway Link Road was closed in both directions for about an hour.
The 28-year-old male driver of the Mitsubishi sustained a suspected broken arm and was taken to Wyong Hospital in a stable condition.
The 4WD has been described as black or dark-coloured, and possibly a Nissan Patrol, Mitsubishi Pajero, or Toyota Hilux.
■ Police are urging anyone with information about this incident to call Crime Stoppers on 1800 333 000.