The collision involved a car and a lorry.
National Highways said:
Northbound J16-J17 collision update. Another lane has been opened past the scene of the collision. 3 lanes now open. The left hand lane remains closed for emergency services to work at the scene. Approximately 50 minute delay. Allow extra time for your journey.
‘M1 northbound between J16 and J17 has long delays of 50 minutes.
‘This is due to 2 lanes (of 4) being closed following a collision involving a car and lorry.’
East Midlands Ambulance Service, police and fire are at the scene of the incident.
There was also an earlier incident southbound.
AA Roadwatch said:
‘Queueing traffic due to earlier accident, five cars involved on M1 Southbound from M1 (Watford Gap Services) to J16 A4500 (Daventry). Lane one (of four) was closed. Watford Gap Services is located between J18 and J16.’