Location : The M4 westbound between junctions J4 and J4B . Lane Closures : The hard shoulder and lane 1 are closed. Reason : Road traffic collision. Status : Currently Active. Time To Clear : The event is expected to clear between 17:45 and 18:00 on 1 June 2021. Return To Normal : Normal traffic conditions are expected between 17:45 and 18:00 on 1 June 2021. Lanes Closed : There is one of four lanes closed.