A pedestrian died when he was hit by several vehicles on the M5 near Bristol.
Avon and Somerset Police said the man was hit by an HGV at about 04:40 BST and was then "struck by a number of other vehicles".
It is believed he left his vehicle after parking on the hard shoulder, a spokesman for the police force said.
The motorway was closed northbound between junctions 16 and 14, but all three lanes have since been re-opened.
The force, said it was "fully aware" of the impact the closure had had on motorists and thanked people for their patience.
"We know how disruptive this has been," a spokesman said.
"Our investigation into this collision will continue and our priority will be to identify the victim and ensure his next of kin are informed and supported."