Location : The M1 northbound between junctions J20 and J21 . Reason : Accident involving an overturned vehicle. Status : Currently Active. Time To Clear : The event is expected to clear between 21:00 and 21:15 on 17 June 2021. Return To Normal : Normal traffic conditions are expected between 21:00 and 21:15 on 17 June 2021. Lanes Closed : All lanes are closed.