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 J15 and J14 | Eastbound | Broken down vehicle
Fri, 05 Jun 2026 20:45:16 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J15 and J14 . 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 22:15 and 22:30 on 5 June 2026. Return To Normal : Normal traffic conditions are expected between 22:15 and 22:30 on 5 June 2026. Lanes Closed : There is one of three lanes closed.

link road from M4 J20 eastbound to M5 J15 | Eastbound | Road Works
Fri, 05 Jun 2026 20:12:17 GMT
M4 Roadworks
Location : The M4 eastbound exit slip at junction J20 . Lane Closures : Lanes 1 and 2 will be closed. Reason : Road repairs are planned. Status : Pending. Schedule : From 22:00 on 12 June 2026 to 06:00 on 13 June 2026. Lanes Closed : All lanes will be closed.

M4 eastbound between J14 and J13 | Eastbound | Road Works
Fri, 05 Jun 2026 19:41:02 GMT
M4 Roadworks
Location : The M4 eastbound between junctions J14 and J13 . Lane Closures : Lane three will be closed. Reason : Roadside drains works are planned. Status : Pending. Schedule : From 20:30 on 12 June 2026 to 06:00 on 13 June 2026. Lanes Closed : There will be one of three lanes closed.

M4 westbound between J13 and J14 | Westbound | Road Works
Fri, 05 Jun 2026 19:41:02 GMT
M4 Roadworks
Location : The M4 westbound between junctions J13 and J14 . Lane Closures : Lanes 2 and 3 will be closed. Reason : Roadside drains works are planned. Status : Pending. Schedule : From 20:30 on 12 June 2026 to 06:00 on 13 June 2026. Lanes Closed : There will be two of three lanes closed.

M4 eastbound at the Leigh Delamere services slip road between J18 and J17 | Eastbound | RoadOrCarriagewayOrLaneManagement
Fri, 05 Jun 2026 20:10:38 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound entry slip at Leigh Delamere Services. Reason : Road Management. Status : Currently Active. Lanes Closed : All lanes are closed.

Map of M4 Motorway Junctions

West M4

East M4

How Do I Find M4 Traffic News?

Latest M4 News