THE M1 is closed between Northampton and Crick following an accident.
The motorway has been shut at junction 15a at Northampton and junction 18 at Crick on the northbound carriageway.
Traffic is at a standstill from junction 14 at Milton Keynes.
The motorway closed following a crash involving two lorries at 2.10pm this afternoon near to the M45 turn.
According to police an insecure load from one of the lorries was in collision with the other.
The southbound carriageway is moving slowly close to the scene and police are advising motorists to avoid the area this evening and find alternative routes.
It is expected to reopen at around 8.30pm tonight (Thursday).