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 J12 eastbound exit | Eastbound | Congestion
Sat, 12 Jul 2025 06:27:18 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound exit slip at junction J12 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 07:30 and 07:45 on 12 July 2025. Delay : There are currently delays of 10 minutes against expected traffic.

connector at M4 J4/M4 spur (Heathrow) | Eastbound | Congestion
Sat, 12 Jul 2025 03:18:27 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 04:15 and 04:30 on 12 July 2025.

M4 J6 eastbound access | Eastbound | Road Works
Fri, 11 Jul 2025 20:20:56 GMT
M4 Roadworks
Location : The M4 eastbound entry slip at junction J6 . Reason : Roadworks. Status : Currently Active. Period : from 21:19 on 11 July 2025 to 06:00 on 12 July 2025. Lanes Closed : All lanes are closed.

M4 westbound within J18 | Westbound | Road Works
Fri, 11 Jul 2025 20:20:56 GMT
M4 Roadworks
Location : The M4 westbound at junction J18 . Lane Closures : Lane three will be closed. Reason : Emergency barrier repairs are planned. Status : Pending. Schedule : From 21:00 on 18 July 2025 to 06:00 on 19 July 2025. Lanes Closed : There will be one of three lanes closed.

M4 J11 westbound exit | Westbound | Congestion
Fri, 11 Jul 2025 22:29:22 GMT
M4 Current Traffic Incidents
Location : The M4 westbound exit slip at junction J11 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 23:30 and 23:45 on 11 July 2025. Delay : There are currently delays of 10 minutes against expected traffic.

Map of M4 Motorway Junctions

West M4

East M4

How Do I Find M4 Traffic News?

Latest M4 News