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?

Simply type the search words in the search facility towards the top right of this page and click "search".

M4 eastbound between J6 and J5 | Eastbound | Broken down vehicle
Tue, 17 Mar 2026 15:36:58 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J6 and J5 . Lane Closures : The hard shoulder and lane 1 are closed. Reason : Broken down vehicle. Status : Currently Active. Time To Clear : The event is expected to clear between 16:15 and 16:30 on 17 March 2026. Return To Normal : Normal traffic conditions are expected between 16:15 and 16:30 on 17 March 2026. Lanes Closed : There is one of four lanes closed.

M4 eastbound between J6 and J5 | Eastbound | Vehicle Recovery
Tue, 17 Mar 2026 15:32:38 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J6 and J5 . Lane Closures : The hard shoulder and lane 1 are closed. Reason : Vehicle tyre change. Status : Currently Active. Time To Clear : The event is expected to clear between 16:00 and 16:15 on 17 March 2026. Return To Normal : Normal traffic conditions are expected between 16:00 and 16:15 on 17 March 2026. Lanes Closed : There is one of four lanes closed.

M4 eastbound between J15 and J14 | Eastbound | Road Works
Tue, 17 Mar 2026 10:34:10 GMT
M4 Roadworks
Location : The M4 eastbound between junctions J15 and J14 . Lane Closures : Lanes 1 and 2 will be closed. Reason : Road repairs are planned. Status : Pending. Schedule : From 20:00 on 18 March 2026 to 06:00 on 19 March 2026. Lanes Closed : There will be two of three lanes closed.

connector at M4 J4/M4 spur (Heathrow) | Eastbound | Congestion
Tue, 17 Mar 2026 11:48:26 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound exit slip at junction J4 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 11:45 and 12:00 on 17 March 2026.

M4 eastbound between J14 and J13 | Eastbound | Broken down vehicle
Tue, 17 Mar 2026 12:17:37 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J14 and J13 . Lane Closures : The hard shoulder and lane 1 are closed. Reason : Broken down vehicle. Status : Currently Active. Time To Clear : The event is expected to clear between 13:15 and 13:30 on 17 March 2026. Return To Normal : Normal traffic conditions are expected between 13:15 and 13:30 on 17 March 2026. Lanes Closed : There is one of three lanes closed.

Map of M4 Motorway Junctions

West M4

East M4

How Do I Find M4 Traffic News?

Latest M4 News