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?

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M4 westbound between J4B and J5 | Westbound | Broken down vehicle
Fri, 31 Oct 2025 08:07:10 GMT
M4 Current Traffic Incidents
Location : The M4 westbound between junctions J4B and J5 . 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 08:45 and 09:00 on 31 October 2025. Lanes Closed : There is one of four lanes closed.

M4 J6 westbound exit | Westbound | Broken down vehicle
Fri, 31 Oct 2025 06:16:17 GMT
M4 Current Traffic Incidents
Location : The M4 westbound exit slip at junction J6 . Reason : Broken down vehicle. Status : Currently Active. Time To Clear : The event is expected to clear between 07:00 and 07:15 on 31 October 2025. Lanes Closed : There are lane closures.

M4 westbound at the Heston services slip road between J2 and J3 | Westbound | Road Works
Thu, 30 Oct 2025 22:14:19 GMT
M4 Roadworks
Location : The M4 westbound exit slip at Heston Services. Reason : Roadworks are planned. Status : Pending. Schedule : From 22:00 on 6 November 2025 to 05:00 on 7 November 2025. Lanes Closed : All lanes will be closed.

M4 westbound at the Heston services between J2 and J3 | Westbound | Road Works
Thu, 30 Oct 2025 22:14:20 GMT
M4 Roadworks
Location : The M4 westbound between junctions J2 and J3 . Lane Closures : Lane one will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : From 22:00 on 6 November 2025 to 05:00 on 7 November 2025. Lanes Closed : There will be one of three lanes closed.

M4 eastbound between J4 and J3 | Eastbound | Road Works
Thu, 30 Oct 2025 23:43:44 GMT
M4 Roadworks
Location : The M4 eastbound between junctions J4B and J3 . Reason : Roadworks. Status : Currently Active. Period : from 23:42 on 30 October 2025 to 05:00 on 31 October 2025. Lanes Closed : All lanes are closed.

Map of M4 Motorway Junctions

West M4

East M4

How Do I Find M4 Traffic News?

Latest M4 News