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 within J7 | Eastbound | Congestion
Fri, 20 Mar 2026 21:22:17 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound at junction J7 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 21:15 and 21:30 on 20 March 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 eastbound within J22 | Eastbound | Road Works
Fri, 20 Mar 2026 21:23:29 GMT
M4 Roadworks
Location : The M4 eastbound at junction J22 . Lane Closures : Lanes 1 and 2 will be closed. Reason : Road repairs are planned. Status : Pending. Schedule : From 21:00 on 27 March 2026 to 06:00 on 28 March 2026. Schedule : Expect disruption everyday between 21:00 and 06:00 from 30 March 2026 to 2 April 2026. Lanes Closed : All lanes will be closed.

M4 J15 westbound access | Westbound | Road Works
Fri, 20 Mar 2026 21:18:10 GMT
M4 Roadworks
Location : The M4 westbound entry slip at junction J15 . Lane Closures : Lane two will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : From 21:00 on 27 March 2026 to 06:00 on 28 March 2026. Lanes Closed : There will be one of two lanes closed.

M4 westbound between J15 and J16 | Westbound | Road Works
Fri, 20 Mar 2026 21:18:10 GMT
M4 Roadworks
Location : The M4 westbound between junctions J15 and J16 . Reason : Roadworks scheme is planned. Status : Pending. Schedule : From 21:00 on 27 March 2026 to 06:00 on 28 March 2026.

M4 westbound between J15 and J16 | Westbound | Road Works
Fri, 20 Mar 2026 21:18:10 GMT
M4 Roadworks
Location : The M4 westbound between junctions J15 and J16 . Lane Closures : Lane two will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : From 21:00 on 27 March 2026 to 06:00 on 28 March 2026. Lanes Closed : There will be one of three lanes closed.

Map of M4 Motorway Junctions

West M4

East M4

How Do I Find M4 Traffic News?

Latest M4 News