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 J7 and J8 | Westbound | Broken down vehicle
Wed, 13 May 2026 22:47:12 GMT
M4 Current Traffic Incidents
Location : The M4 westbound between junctions J7 and J8 . Lane Closures : Lane one is closed. Reason : Broken down vehicle. Status : Currently Active. Time To Clear : The event is expected to clear between 00:30 and 00:45 on 14 May 2026. Return To Normal : Normal traffic conditions are expected between 00:30 and 00:45 on 14 May 2026. Lanes Closed : There is one of four lanes closed.

M4 eastbound between J21 and J20 | Eastbound | Broken down vehicle
Wed, 13 May 2026 20:57:07 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J22 and J20 . 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 23:00 and 23:15 on 13 May 2026. Return To Normal : Normal traffic conditions are expected between 23:00 and 23:15 on 13 May 2026. Lanes Closed : There is one of three lanes closed.

M4 eastbound between J18 and J17 | Eastbound | Road Works
Wed, 13 May 2026 19:28:03 GMT
M4 Roadworks
Location : The M4 eastbound between junctions J18 and J17 . Lane Closures : Lane one will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : Expect disruption everyday between 20:00 and 06:00 from 20 May 2026 to 22 May 2026. Schedule : From 20:00 on 25 May 2026 to 06:00 on 26 May 2026. Schedule : Expect disruption everyday between 20:00 and 06:00 from 27 May 2026 to 29 May 2026. Lanes Closed : There will be one of three lanes closed.

M4 eastbound within J22 | Eastbound | Road Works
Wed, 13 May 2026 19:14:00 GMT
M4 Roadworks
Location : The M4 eastbound between junctions J23 and J22 . Lane Closures : Lanes 1, 2 and 3 will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : From 21:00 on 20 May 2026 to 06:00 on 21 May 2026. Lanes Closed : All lanes will be closed.

M4 eastbound within J22 | Eastbound | Road Works
Wed, 13 May 2026 19:18:51 GMT
M4 Roadworks
Location : The M4 eastbound between junctions J23 and J22 . Reason : Roadworks scheme is planned. Status : Pending. Schedule : From 21:00 on 20 May 2026 to 06:00 on 21 May 2026.

Map of M4 Motorway Junctions

West M4

East M4

How Do I Find M4 Traffic News?

Latest M4 News