A HGV vehicle has left the northbound carriageway and fell around 60 metres onto an embankment between Junction 20 and 21, close to the Thelwall Viaduct.
Fire Crews used technical rescue equipment to lower themselves and reach the casualty, who was handed over to the care of attending paramedics and applied water to cool the HGV and are using bunding to contain a leak of approximately 1000 litres of bio-diesel from the fuel tanks of the vehicle.
The driver of the vehicle is not believed to have suffered any life-threatening injuries, the force added.
The accident saw the carriageway closed for some time this evening but it has now been fully reopened
