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 J8 westbound exit | Westbound | Road Works
Tue, 07 Apr 2026 20:52:42 GMT
M4 Roadworks
Location : The M4 westbound exit slip at junction J8 . Reason : Roadworks. Status : Currently Active. Period : from 21:52 on 7 April 2026 to 06:00 on 8 April 2026. Lanes Closed : All lanes are closed.

M4 J8 westbound access | Westbound | Road Works
Tue, 07 Apr 2026 20:51:27 GMT
M4 Roadworks
Location : The M4 westbound entry slip at junction J8 . Reason : Roadworks. Status : Currently Active. Period : from 21:50 on 7 April 2026 to 06:00 on 8 April 2026. Lanes Closed : All lanes are closed.

M4 westbound at the Reading services between J11 and J12 | Westbound | Road Works
Tue, 07 Apr 2026 20:20:37 GMT
M4 Roadworks
Location : The M4 westbound between junctions J11 and J12 . Lane Closures : Lanes 1 and 2 will be closed. Reason : Barrier repairs are planned. Status : Pending. Schedule : From 21:00 on 14 April 2026 to 06:00 on 15 April 2026. Lanes Closed : There will be two of four lanes closed.

M4 eastbound within J10 before A329(M) westbound access | Eastbound | Road Works
Tue, 07 Apr 2026 20:17:52 GMT
M4 Roadworks
Location : The M4 eastbound at junction J10 . Lane Closures : Lanes 1 and 2 will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : Expect disruption everyday between 21:00 and 06:00 from 14 April 2026 to 18 April 2026. Schedule : Expect disruption everyday between 21:00 and 06:00 from 20 April 2026 to 25 April 2026. Schedule : Expect disruption everyday between 21:00 and 06:00 from 27 April 2026 to 2 May 2026. Lanes Closed : There will be two of three lanes closed.

M4 eastbound between J17 and J16 | Eastbound | RoadOrCarriagewayOrLaneManagement
Tue, 07 Apr 2026 20:38:47 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J17 and J16 . Lane Closures : The hard shoulder, lanes 1 and 2 are closed. Reason : Road Management. Status : Currently Active. Time To Clear : The event is expected to clear between 23:00 and 23:15 on 7 April 2026. Return To Normal : Normal traffic conditions are expected between 23:00 and 23:15 on 7 April 2026. Lanes Closed : There are two of three lanes closed.

Map of M4 Motorway Junctions

West M4

East M4

How Do I Find M4 Traffic News?

Latest M4 News