M4 westbound between J20 and J21 | Westbound | Congestion

Location : The M4 westbound between junctions J20 and J21 .
Reason : Congestion.
Status : Currently Active.
Return To Normal : Normal traffic conditions are expected between 21:15 and 21:30 on 29 April 2026.
Delay : There are currently delays of 10 minutes against expected traffic.