Motorists have been warned to avoid the M1 northbound near Northampton after an accident earlier this morning brought traffic to a standstill.
The delays start just after junction 16 and stretch up to junction 17, according to reports from Highways England.
A spokesman for Northamptonshire Police said the delays were due to a collision involving five lorries at around 7.30am.
Ambulance crews and Northamptonshire Fire and Rescue have attended the scene.
Traffic is also reportedly slow southbound as vehicles pass the scene.