Location : The M4 westbound between junctions J20 and J21 .
Lane Closures : Lane two is closed.
Reason : Road traffic collision.
Status : Currently Active.
Time To Clear : The event is expected to clear between 12:30 and 12:45 on 11 March 2026.
Return To Normal : Normal traffic conditions are expected between 13:30 and 13:45 on 11 March 2026.
Delay : There are currently delays of 30 minutes against expected traffic.
Lanes Closed : There is one of two lanes closed.
