The M1 Northbound between Junction 14 (Milton Keynes) and Junction 15 (Northampton has reopened this morning.
A serious collision reported just before 11pm last night had seen closures in place overnight.
Highways England have now confirmed that investigation, recovery and clear-up work is complete and the M1 is open Northbound.
> Meanwhile, congestion is reported on the A5 Northbound between the junctions with the A422 and the A508, which is causing delays of 20 minutes.
Normal traffic conditions are expected between 8.30am and 8.45am.