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A two-lorry crash on the country's busiest motorway led to rush-hour delays.
The crash near J1B, for the A282 for Dartford, happened at 7.25am and traffic was queuing as far back as halfway to J30, the A13 (Purfleet Interchange).
While all lanes are now open and the HGVs have been moved onto the hard shoulder there are still some delays.
There were no injuries.