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.

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link road from M5 J15 southbound to M4 J20 eastbound | Eastbound | Congestion
Wed, 30 Apr 2025 00:09:26 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound entry slip at junction J20 from M5 south. Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 01:00 and 01:15 on 30 April 2025.

M4 eastbound between J2 and J1 | Eastbound | Road Works
Tue, 29 Apr 2025 22:00:16 GMT
M4 Roadworks
Location : The M4 eastbound between junctions J3 and J1 . Reason : Roadworks. Status : Currently Active. Period : from 22:59 on 29 April 2025 to 05:00 on 30 April 2025. Lanes Closed : All lanes are closed.

M4 eastbound within J22 | Eastbound | Road Works
Tue, 29 Apr 2025 20:36:27 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 : Expect disruption everyday between 21:00 and 06:00 from 6 May 2025 to 8 May 2025. Lanes Closed : All lanes will be closed.

M4 westbound within J22 | Westbound | Road Works
Tue, 29 Apr 2025 20:34:25 GMT
M4 Roadworks
Location : The M4 westbound between junctions J20 and J22 . Reason : Roadworks scheme is planned. Status : Pending. Schedule : From 21:00 on 6 May 2025 to 06:00 on 7 May 2025.

M4 westbound between J2 and J3 | Westbound | Road Works
Tue, 29 Apr 2025 21:26:47 GMT
M4 Roadworks
Location : The M4 westbound between junctions J1 and J3 . Reason : Roadworks. Status : Currently Active. Period : from 22:24 on 29 April 2025 to 05:00 on 30 April 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