Location : The M4 eastbound entry slip at junction J4B from the M25 clockwise. Reason : Road traffic collision. Status : Currently Active. Time To Clear : The event is expected to clear between 23:30 and 23:45 on 25 March 2022. Return To Normal : Normal traffic conditions are expected between 23:30 and 23:45 on 25 March 2022. Lanes Closed : There are lane closures.