The incident occurred on the westbound carriageway between junctions 44 and 43 at around 1.30am this morning, Monday 15 April.
A 16-year-old girl was involved in a collision with a lorry and sadly died at the scene.
The road was closed in both directions until 6.40am when the eastbound side reopened. The westbound carriageway was reopened at 11.40am.
Officers are appealing for any witnesses to the collision and asking any motorists driving in the area at the time of the incident with a dashcam fitted in their vehicle, to review the footage for any material that may be of assistance.
Anyone with information is asked to contact the Roads and Armed Policing Team at Bury St Edmunds Police Station, quoting reference: 37/20659/24.
Website – https:///www.suffolk.police.uk/tell-us
Phone – Call 101
Please note in the event of an emergency you should always call 999
If you have been involved in or affected by a road traffic collision, advice and support information can be found at: www.suffolk.police.uk/advice/advice-and-information/rs/road-safety/road-traffic-incident-support-organisations/
