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At approximately 2am today, officers attended an incident between junction 15 and 16 of the motorway, near the road bridge (A4361) near Wroughton.
Sadly, a young woman died at the scene.
Our thoughts are with her family at this very difficult time.
Any witnesses to the collision or anyone who may have dash cam are asked to contact the Serious Collision Investigation Team at Police Headquarters on 01225 694597.
Alternatively they can contact the team directly - [email protected]