A diversion has been put in place after a serious accident resulted in fuel being spilt on the motorway.
The M1 in Northamptonshire is closed and there is queuing traffic and long delays northbound between J15 A45 Northampton West and J18 A5 Rugby.
Resurfacing work is taking place after the accident caused a fuel spillage.
Diverted traffic should follow the Hollow Black Triangle signs via the A45 West towards Weedon Bec, A5 North towards Hinckley, and the A428 East back to the M1 at J18.
The incident has caused congestion to J15, A45 Northampton.