Location : The M4 westbound between junctions J12 and J13 . Lane Closures : Lanes 2 and 3 are closed. Reason : Road traffic collision. Status : Currently Active. Time To Clear : The event is expected to clear between 22:00 and 22:15 on 1 July 2021. Return To Normal : Normal traffic conditions are expected between 22:00 and 22:15 on 1 July 2021. Lanes Closed : There are two of three lanes closed.