2 lanes have closed between Junction 16 and 15A (Northampton) on the M1 southbound.
The accident is reported to have occurred this morning (15/7).
Traffic officers are on the scene to are assisting with recovery.
It is estimated that there are major delays of at least 45 minutes above the average journey time in the area.
It is unknown if anyone was injured as a result of the road traffic collision.
12:27- ALL TRAFFIC STOPPED SOUTHBOUND