Location : The M4 westbound entry slip at junction J15 . Reason : Road traffic collision. Status : Currently Active. Time To Clear : The event is expected to clear between 12:30 and 12:45 on 26 July 2021. Return To Normal : Normal traffic conditions are expected between 12:30 and 12:45 on 26 July 2021. Lanes Closed : All lanes are closed.