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A broken down lorry is causing long delays getting over the Dartford Crossing.
Two lanes have been blocked by the incident approaching the bridge to enter Kent following the incident at about 7.30am.
Highways England said the lanes have been closed with the remaining two struggling to cope with the traffic.
Six mile tailbacks have been reported on the M25 on the approach to the incident on the A282 crossing section.
Motorists were warned to expect delays of about 40 minutes.
The lanes reopened at about 9am but traffic was reportedly queued back to junction 29 for Romford.
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