Location : The M4 eastbound entry slip at junction J18 . Reason : Accident involving an overturned vehicle. Status : Currently Active. Time To Clear : The event is expected to clear between 11:15 and 11:30 on 2 July 2021. Return To Normal : Normal traffic conditions are expected between 11:15 and 11:30 on 2 July 2021. Lanes Closed : All lanes are closed.