Location : The M4 westbound between junctions J3 and J4 . Reason : Road traffic collision. Status : Currently Active. Time To Clear : The event is expected to clear between 06:00 and 06:15 on 28 June 2021. Return To Normal : Normal traffic conditions are expected between 06:00 and 06:15 on 28 June 2021. Lanes Closed : There are lane closures.