A lorry driver has died at the scene of a crash on the M20 in Kent which also left a man with a serious leg injury.
The collision was at 02:00 BST on the London-bound carriageway near Maidstone.
A 19-year-old Vauxhall Corsa driver was hit by another car after he got out of his vehicle.
Medics treated the teenager for a serious leg injury before taking him to King’s College Hospital in London by road, accompanied by members of the air ambulance crew.
The 44-year-old lorry driver, from Poland, then suffered a suspected heart attack and was pronounced dead. Police are hunting for the second car.
The London-bound M20 was closed between junctions six and seven for eight hours, with long queues of rush-hour traffic building up.
Police have now issued an appeal for witnesses to the incidents.
Det Sgt Scott Lynch said it was a dark colour and is likely to have suffered significant damage to the front.
Anyone with information is asked to call the serious collision investigation unit on 01622 798538 quoting reference 18-0075 or email firstname.lastname@example.org.