
There were long delays earlier on the M1 Northbound in Milton Keynes due to an accident blocking two lanes.
Congestion and the lane closure was between J14 at Milton Keynes and J15 at Northampton, through the roadworks.
Long delays were being reported by drivers in the area.
All lanes have now re-opened and traffic has returned to normal.
It is not yet known how many vehicles were involved in the accident but highways officials described it as 'multi-vehicle'.