Highways England is reporting two lanes are blocked on the M1 northbound between junction 15A and junction 16.
An accident involving two HGV's have blocked two lanes just north of MK on the M1.
Vehicles are currently queuing for around 15 miles, backed up to to Newport Pagnell Services.
Traffic is also building up southbound due to onlookers passing the scene.
The A43 has also been reported to have queues heading towards the M1 from Towcester.
UPDATE 17:30- Highways England reports a few different breakdowns, and it's causing a lot of congestion through Northampton northbound. Please plan for long delays and consider an alternative route when travelling.
UPDATE 17:45- There are currently delays of 37 minutes and 8 miles of congestion on the M1 northbound between J15A and J16 following these incidents.