A man has died after a collision involving a car, a police vehicle and an ambulance.
The 19-year-old had been "in the carriageway" when the three vehicles collided at around 4.35am on Sunday, Suffolk Police said.
He is believed to have been from the local area and died at the scene.
His next of kin has been told but he has not yet been formally identified.
"Neither the police car or the ambulance were responding to an emergency at the time and as such were not travelling on 'blue light' runs," police said.
"The police vehicle was conveying a person under arrest to custody and the ambulance had a patient on board, however no one in either of these vehicles, or the other car involved, sustained any injuries."
The westbound A14 near Rougham was closed was closed for around 10 hours while officers investigated.
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Suffolk Police have informed the Independent Office for Police Conduct, as is standard procedure.
Anyone with information can contact the serious collision investigation team on 101, quoting reference CAD 80 of 14 October.
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