The southbound track of the A12 between Ipswich and Colchester was closed last night after the discovery of a body.
Members of the public dialled 999 after making the discovery.
Emergency services were called to the Colchester-bound carriageway near Capel St Mary at about 9.45pm last night.
On arrival police confirmed they had discovered a body, believed to be that of a woman. The death is currently being treated as "unexplained".
A car was also recovered from a layby at the scene, which officers are examining for evidence.
The southbound carriageway was closed between the Copdock and East Bergholt junctions until about 5am. The layby remains closed.
A post mortem examination is due to be carried out later today.
- Police are appealing for anyone who was in the Capel area before 9.45pm or who has any information about this incident, to contact Suffolk Police on 01473 613500
- More online later and in tomorrow's Gazette
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