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 westbound between J10 and J11 | Westbound | Vehicle Obstruction
Tue, 24 Mar 2026 02:30:38 GMT
M4 Current Traffic Incidents
Location : The M4 westbound between junctions J10 and J11 . Lane Closures : The hard shoulder and lane 1 are closed. Reason : Abandoned vehicle. Status : Currently Active. Time To Clear : The event is expected to clear between 03:45 and 04:00 on 24 March 2026. Return To Normal : Normal traffic conditions are expected between 03:45 and 04:00 on 24 March 2026. Lanes Closed : There is one of four lanes closed.

link road from M25 J15 to M4 J4B eastbound | Eastbound | Road Works
Mon, 23 Mar 2026 22:19:58 GMT
M4 Roadworks
Location : The M4 eastbound entry slip at junction J4B . Lane Closures : Lane one will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : From 22:00 on 30 March 2026 to 05:30 on 31 March 2026. Lanes Closed : There will be one of two lanes closed.

M4 westbound within J11 | Westbound | Road Works
Mon, 23 Mar 2026 21:22:18 GMT
M4 Roadworks
Location : The M4 westbound at junction J11 . Lane Closures : Lanes 1 and 2 will be closed. Reason : Litter clearance is planned. Status : Pending. Schedule : From 21:00 on 30 March 2026 to 06:00 on 31 March 2026. Lanes Closed : There will be two of three lanes closed.

M4 eastbound within J4B | Eastbound | Road Works
Mon, 23 Mar 2026 22:19:58 GMT
M4 Roadworks
Location : The M4 eastbound at junction J4B . Lane Closures : Lanes 1, 2 and 3 will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : From 22:00 on 30 March 2026 to 05:30 on 31 March 2026. Lanes Closed : All lanes will be closed.

M4 eastbound between J4B and J4 | Eastbound | Road Works
Mon, 23 Mar 2026 22:19:55 GMT
M4 Roadworks
Location : The M4 eastbound between junctions J4B and J4 . Lane Closures : Lanes 1, 2 and 3 will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : From 22:00 on 30 March 2026 to 05:30 on 31 March 2026. Lanes Closed : There will be three of five lanes closed.

Map of M4 Motorway Junctions

West M4

East M4

How Do I Find M4 Traffic News?

Latest M4 News