An accident involving an HGV has led to a lane of the M1 being closed in Northampton
Highways England says the southbound carriageway from junction 16 to junction 15a has a lane closed so workmen can carry out emergency repairs to a barrier.
It follows an earlier collision involving a lorry.
A spokesman for Highways England said: "Traffic is busy so please take some extra time if heading south."
At just before 9am, delays were estimated at 12 minutes.