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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 13:15 and 13:30 on 21 March 2026.
Return To Normal : Normal traffic conditions are expected between 14:15 and 14:30 on 21 March 2026.
Lanes Closed : There is one of two lanes closed.
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 13:15 and 13:30 on 21 March 2026.
Return To Normal : Normal traffic conditions are expected between 14:15 and 14:30 on 21 March 2026.
Lanes Closed : There is one of two lanes closed.
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 13:15 and 13:30 on 21 March 2026.
Return To Normal : Normal traffic conditions are expected between 14:15 and 14:30 on 21 March 2026.
Lanes Closed : There is one of two lanes closed.
Wording as published by National Highways, recorded as it changed.
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