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 within J22 | Westbound | Road Works
Wed, 11 Feb 2026 14:37:53 GMT
M4 Roadworks
Location : The M4 westbound between junctions J21 and J22 . Lane Closures : Lane two will be closed. Reason : Emergency barrier repairs are planned. Status : Pending. Schedule : Expect disruption everyday between 21:00 and 06:00 from 11 February 2026 to 13 February 2026. Lanes Closed : There will be one of two lanes closed.

M4 eastbound between J8 and J7 | Eastbound | Broken down vehicle
Wed, 11 Feb 2026 11:44:45 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J8 and J7 . 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 12:15 and 12:30 on 11 February 2026. Return To Normal : Normal traffic conditions are expected between 12:15 and 12:30 on 11 February 2026. Lanes Closed : There is one of four lanes closed.

M4 westbound at the Membury services slip road between J14 and J15 | Westbound | Road Works
Wed, 11 Feb 2026 10:54:57 GMT
M4 Roadworks
Location : The M4 westbound entry slip at Membury Services. Reason : Road repairs are planned. Status : Pending. Schedule : From 22:00 on 16 February 2026 to 06:00 on 17 February 2026. Lanes Closed : All lanes will be closed.

M4 westbound at the Membury services slip road between J14 and J15 | Westbound | Road Works
Wed, 11 Feb 2026 10:54:57 GMT
M4 Roadworks
Location : The M4 westbound exit slip at Membury Services. Reason : Road repairs are planned. Status : Pending. Schedule : From 22:00 on 16 February 2026 to 06:00 on 17 February 2026. Lanes Closed : All lanes will be closed.

M4 westbound between J14 and J15 | Westbound | Road Works
Wed, 11 Feb 2026 10:54:58 GMT
M4 Roadworks
Location : The M4 westbound between junctions J14 and J15 . Lane Closures : Lanes 1 and 2 will be closed. Reason : Road repairs are planned. Status : Pending. Schedule : From 22:00 on 16 February 2026 to 06:00 on 17 February 2026. Lanes Closed : There will be two of three lanes closed.

Map of M4 Motorway Junctions

West M4

East M4

How Do I Find M4 Traffic News?

Latest M4 News