M4 westbound within J4B | Westbound | Congestion

Location : The M4 westbound between junctions J4 and J4B .
Reason : Congestion.
Status : Currently Active.
Return To Normal : Normal traffic conditions are expected between 08:45 and 09:00 on 12 December 2025.
Delay : There are currently delays of 30 minutes against expected traffic.