The M25 anticlockwise is closed, with stationary traffic at A282 (Dartford River Crossing toll booths).
The tunnel has been closed due to the accident that has blocked the carriageway between J31 and J30.
More top news
Parents fear council plans to expand Aldryngton Primary School in Wokingham will make an already dangerous traffic problem, even worse.
Simon's Blog - Winter Wonderland
Tuesday night's weather for the west of the region