The southbound M1 was closed between Junction 31 for Aston and Junction 31 for Barlborough earlier today due to a ‘police-led incident’.
Despite two of the four lanes now re-open, there are 40 minute delays on the approach.
Highways England said queues are seven miles long, stretching back to Junction 1 of the M18 and Junction 33 of the M1.
The agency said: “Please allow extra journey time.”