UPDATED: M1 motorway reopens after serious accident
Police said three cars and a pick-up truck were involved in a collision just before 2pm.
It happened near junction 43 of the southbound carriageway where the motorway merges with the M621.
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Hide AdThe southbound M1 was closed between junction 44 and 43 from 2pm to just after 3.30pm to allow the Yorkshire Air Ambulance to land.
A man who suffered head injuries was taken to Leeds General Infirmary by air ambulance.
Two lanes of the M1 southbound between junctions 44 and 43 have been re-opened while one lane remains closed.
Police said the slip road at Junction 7 of the M621 southbound remains closed.