Emergency services have stopped traffic on the M1 travelling southbound this morning (Wednesday).
Traffic officers are currently on the scene and traffic has been stopped on the M1 southbound between junction 19 at Catthorpe and junction 18 for Crick due to two separate collisions.
There are long delays heading south.
Highways England tweeted: "All lanes have now reopened on the #M1 southbound between J19 and J18 following the earlier collisions. Minor delays remain, but should now start to clear."