Drivers are being warned to allow extra time for their journeys during Wednesday's rush hour following after a smash on the M1 near Northampton.
Highways England say lane one of three is blocked at the junction 15A northbound exit slip due to a collision involving a car and van.
The northbound entry slip has been closed for recovery work.
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A spokesman said: "Traffic officers are on scene and are dealing with the incident but please take care on the approach to junction 15A and allow extra time for your journey."