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 J6 westbound exit | Westbound | Congestion
Thu, 26 Mar 2026 02:50:24 GMT
M4 Current Traffic Incidents
Location : The M4 westbound exit slip at junction J6 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 02:45 and 03:00 on 26 March 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 J4 eastbound exit | Eastbound | Congestion
Wed, 25 Mar 2026 23:21:26 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound exit slip at junction J4 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 23:15 and 23:30 on 25 March 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 westbound within J10 after A329(M) eastbound access | Westbound | Road Works
Wed, 25 Mar 2026 21:29:11 GMT
M4 Roadworks
Location : The M4 westbound at junction J10 . Lane Closures : Lanes 1, 2 and 3 will be closed. Reason : Barrier repairs are planned. Status : Pending. Schedule : From 21:00 on 1 April 2026 to 06:00 on 2 April 2026. Lanes Closed : All lanes will be closed.

link road from A329(M) westbound to M4 J10 westbound | Westbound | Road Works
Wed, 25 Mar 2026 21:29:11 GMT
M4 Roadworks
Location : The M4 westbound entry slip at junction J10 . Lane Closures : Lanes 1 and 2 will be closed. Reason : Barrier repairs are planned. Status : Pending. Schedule : From 21:00 on 1 April 2026 to 06:00 on 2 April 2026. Lanes Closed : All lanes will be closed.

link road from M4 J4B eastbound to M25 J15 | Eastbound | Road Works
Wed, 25 Mar 2026 22:55:03 GMT
M4 Roadworks
Location : The M4 eastbound exit slip at junction J4B . Reason : Roadworks. Status : Currently Active. Period : from 22:54 on 25 March 2026 to 05:00 on 26 March 2026. 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