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Two lanes on a busy road were closed and severe delays are expected after a crash between a car and a lorry.
The accident happened just before 3.30pm on the M25 clockwise at Princes Road, Dartford (J1B A296).
The main carriageway was closed and there is queuing traffic.
There is also congestion to Lakeside/Tilbury (J30).
All lanes have now re-opened.
Police confirmed they were called to the collision, and no injuries were reported.
The road was re-opened by 4.25pm.