Motorists are being warned to expect delays on the M1 in Northamptonshire after a crash.
The incident happened at around 2pm on the northbound carriageway between junctions 16 (Flore) and 17 (for the M45).
The crash appears to have happened just south of the Watford Gap services, and queues have already built up back to junction 16.
Highways England says that those stuck in the jam can expect to be delayed for an hour currently and that the incident is expected to be cleared by 4.45pm this evening.
Traffic is also already building up on alternative routes including the A5.