Drivers are facing delays of up to 90 MINUTES heading into the evening rush hour after a smash involving two HGVs on the M1 near Northampton.
Highways England is reporting two lanes are blocked northbound between junction 15A and junction 16.
Traffic sensors showed vehicles crawling for around 15 miles, most of the way to Newport Pagnell Services, at around 3.30pm.
Northamptonshire Police confirmed a call reporting the smash at 2.54pm but there are no reports of serious injuries.
Traffic is also slow past the scene southbound and the A43 is snarled up heading towards the M1 from Towcester.