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 between J10 and J8 | Eastbound | Road Works
Thu, 07 May 2026 19:23:09 GMT
M4 Roadworks
Location : The M4 eastbound between junctions J10 and J8 . Lane Closures : Lanes 1 and 2 will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : From 20:00 on 14 May 2026 to 06:00 on 15 May 2026. Lanes Closed : There will be two of four lanes closed.

M4 eastbound within J8 | Eastbound | Road Works
Thu, 07 May 2026 19:23:09 GMT
M4 Roadworks
Location : The M4 eastbound at junction J8 . Lane Closures : Lanes 1 and 2 will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : From 20:00 on 14 May 2026 to 06:00 on 15 May 2026. Lanes Closed : There will be two of three lanes closed.

M4 J19 westbound exit | Westbound | Congestion
Thu, 07 May 2026 16:21:47 GMT
M4 Current Traffic Incidents
Location : The M4 westbound exit slip at junction J19 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 17:15 and 17:30 on 7 May 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 J19 westbound exit | Westbound | Congestion
Thu, 07 May 2026 16:49:24 GMT
M4 Current Traffic Incidents
Location : The M4 westbound exit slip at junction J19 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 17:45 and 18:00 on 7 May 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 J4 eastbound exit | Eastbound | Congestion
Thu, 07 May 2026 17:47:36 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 18:45 and 19:00 on 7 May 2026.

Map of M4 Motorway Junctions

West M4

East M4

How Do I Find M4 Traffic News?

Latest M4 News