Location : The M40 southbound between junctions J2 and J1A . Lane Closures : Lanes 2, 3 and 4 are closed. Reason : Road traffic collision. Status : Currently Active. Time To Clear : The event is expected to clear between 02:30 and 02:45 on 28 June 2021. Return To Normal : Normal traffic conditions are expected between 02:30 and 02:45 on 28 June 2021. Lanes Closed : There are three of four lanes closed.