Traffic is building on the A14 after a two-car crash on a slip road of the Copdock Interchange.
Suffolk Constabulary said they were called at 7.10pm to a crash on the road joining the eastbound carriageway towards Felixstowe.
A female driver had suffered a head injury and an ambulance was called.
Police and fire crews remain at the scene and traffic is building, according to the AA map.
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