Gridlocked traffic is building around the A14 and A426 as more rush hour commuters join the chaos.
There are heavy queues and drivers are being advised to avoid the area after a serious accident at the M1 / A14 junction (Catthorpe Interchange).
The link road from the A14 westbound onto the M6 northbound and the M6 southbound onto the A14 eastbound are closed.
The accident is directly at the end of the motorway.
All traffic is forced to join the M1 at the interchange.
Highways England has said the A426 at J20 is gridlocked and now queuing back to J19 to get off at J20.
They advise drives to use J21 and then the M69 south to re-join the M6 at J2 Anstey.
Highways England has said that normal traffic conditions are expected at around 8.30pm.