All lanes of the M1 are now open after the accident involving five lorries between Junction 25 and 26.
The motorway is still congested with journeys between junctions 24 and 25 taking 40 minutes.
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The announcement comes a day after a ballot for action by catering supply staff on the West Coast route was launched in a dispute over pay.
Cloudy and breezy tonight with rain. Drier tomorrow.
Turning cloudy and becoming windier later. Patchy rain overnight.