Motorists are being advised to avoid the M1 northbound between junction 15a and 16 after a road traffic collision this morning.
Three lorries collided just after 4am resulting in one man sustaining serious injuries.
The outside lane has been re-opened, however it is likely to be late morning before all three lanes are fully open due to a significant diesel spill.
Motorists are advised to find an alternative route if they are planning to travel northbound between junctions 15a and 16.
A diversion is in place taking traffic off at junction 15a, on to the A45 and back on the M1 at junction 16.
There is significant congestion around junction 15a and the A5 as a result of the road closure, so motorists are also being advised to leave plenty of time for their journey.