Map of M4 Motorway Junctions

Map of the M4 motorway junctions.

West M4

To the West the M4 joins the M5 at M4 Junction 20 which heads north to Devon Cornwall and the South West of England.

The Western end of the M4 is in South Wales Junctions 23 to 48. Bridgend is on Junctions 25 to 37, M4 Junctions 44 and 45 for Swansea, Junctions 30 to 33 for Cardiff and Junctions 24 to 28 for Newport.

East M4

At the eastern end of the M4 is London, with Junctions for Slough, Reading, Newbury, Swindon and Bristol on the way to Wales in the West.

How Do I Find M4 Traffic News?

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M4 eastbound within J19 | Eastbound | Congestion
Sun, 17 May 2026 16:37:23 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound at junction J19 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 17:30 and 17:45 on 17 May 2026. Delay : There are currently delays of 10 minutes against expected traffic. Earlier Reason : Caused by an earlier accident.

M4 westbound between J8 and J10 | Westbound | Broken down vehicle
Sun, 17 May 2026 16:31:53 GMT
M4 Current Traffic Incidents
Location : The M4 westbound between junctions J8 and J10 . Lane Closures : The hard shoulder and lane 1 are closed. Reason : Broken down vehicle. Status : Currently Active. Lanes Closed : There is one of four lanes closed.

M4 westbound between J7 and J8 | Westbound | Accident
Sun, 17 May 2026 15:53:13 GMT
M4 Current Traffic Incidents
Location : The M4 westbound between junctions J7 and J8 . Lane Closures : Lane one is closed. Reason : Road traffic collision. Status : Currently Active. Time To Clear : The event is expected to clear between 18:00 and 18:15 on 17 May 2026. Return To Normal : Normal traffic conditions are expected between 18:00 and 18:15 on 17 May 2026. Lanes Closed : There is one of four lanes closed.

M4 J19 westbound exit | Westbound | Congestion
Sun, 17 May 2026 16:11:27 GMT
M4 Current Traffic Incidents
Location : The M4 westbound exit slip at junction J19 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 17:15 and 17:30 on 17 May 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 westbound between J7 and J8 | Westbound | Accident
Sun, 17 May 2026 16:13:33 GMT
M4 Current Traffic Incidents
Location : The M4 westbound between junctions J7 and J8 . Lane Closures : Lane one is closed. Reason : Road traffic collision. Status : Currently Active. Lanes Closed : There is one of four lanes closed.

Map of M4 Motorway Junctions

West M4

East M4

How Do I Find M4 Traffic News?

Latest M4 News