Two lanes of the M1 heading north have been closed this afternoon (Monday).
UPDATE 4pm: All lanes have now reopened but long tailbacks remain
There are currently severe delays on the northbound stretch of the M1 between junction 14 for Milton Keynes and junction 15 for Northampton.
Two lanes have been closed and traffic is queuing for eight miles due to an accident involving a lorry and a car.
All emergency services are on the scene.
Traffic is expected to return to normal by around 6.30pm.