Location : The M4 westbound exit slip at junction J4 . Lane Closures : Lane one is closed. Reason : Broken down vehicle. Status : Currently Active. Time To Clear : The event is expected to clear between 03:00 and 03:15 on 29 June 2021. Return To Normal : Normal traffic conditions are expected between 03:00 and 03:15 on 29 June 2021. Lanes Closed : There is one of two lanes closed.