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 eastbound within J10 after A329(M) westbound access | Eastbound | Congestion
Mon, 29 Jun 2026 07:08:55 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound at junction J10 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 08:00 and 08:15 on 29 June 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 eastbound at the Heston services between J3 and J2 | Eastbound | Congestion
Mon, 29 Jun 2026 06:50:27 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J3 and J2 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 07:45 and 08:00 on 29 June 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 eastbound between J5 and J4B | Eastbound | Road Works
Sun, 28 Jun 2026 21:42:00 GMT
M4 Roadworks
Location : The M4 eastbound between junctions J5 and J4B . Lane Closures : Lane one will be closed. Reason : Emergency barrier repairs are planned. Status : Pending. Schedule : From 22:30 on 5 July 2026 to 05:30 on 6 July 2026. Lanes Closed : There will be one of five lanes closed.

M4 eastbound within J4B | Eastbound | Road Works
Sun, 28 Jun 2026 21:41:59 GMT
M4 Roadworks
Location : The M4 eastbound at junction J4B . Lane Closures : Lane one will be closed. Reason : Emergency barrier repairs are planned. Status : Pending. Schedule : From 22:30 on 5 July 2026 to 05:30 on 6 July 2026. Lanes Closed : There will be one of three lanes closed.

M4 J3 eastbound exit | Eastbound | Broken down vehicle
Sun, 28 Jun 2026 23:13:41 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound exit slip at junction J3 . Lane Closures : Lane one is closed. Reason : Broken down vehicle. Status : Currently Active. Time To Clear : The event is expected to clear between 00:45 and 01:00 on 29 June 2026. Return To Normal : Normal traffic conditions are expected between 00:45 and 01:00 on 29 June 2026. Lanes Closed : There is one of three lanes closed.

Map of M4 Motorway Junctions

West M4

East M4

How Do I Find M4 Traffic News?

Latest M4 News