The A12 northbound in Suffolk is closed because of a two-car collision.
It happened at around 7.40pm near the junction for Copdock and involved a Renault Laguna and a silver Mini.
The northbound carriageway has been closed because of the crash and around 30 metres of the central reservation has been damaged. The southbound carriageway is running as normal.
A police spokesman said there were no serious injuries reported and a diversion was now in place.
However he added there would be delays for quite some time while recovery for the vehicles arrived and the barriers were repaired.
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