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 J8 westbound exit | Westbound | Broken down vehicle
Fri, 08 May 2026 08:24:33 GMT
M4 Current Traffic Incidents
Location : The M4 westbound exit slip at junction J8 . Lane Closures : Lane two is closed. Reason : Broken down vehicle. Status : Currently Active. Lanes Closed : There is one of two lanes closed.

M4 westbound within J8 | Westbound | Road Works
Fri, 08 May 2026 08:21:19 GMT
M4 Roadworks
Location : The M4 westbound at junction J8 . Lane Closures : Lanes 1 and 2 will be closed. Reason : Litter clearance is planned. Status : Pending. Schedule : From 21:00 on 8 May 2026 to 06:00 on 9 May 2026. Lanes Closed : There will be two of three lanes closed.

connector at M4 J4/M4 spur (Heathrow) | Eastbound | Congestion
Fri, 08 May 2026 07:21:20 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 08:15 and 08:30 on 8 May 2026.

M4 J18 eastbound exit | Eastbound | Congestion
Fri, 08 May 2026 07:43:24 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound exit slip at junction J18 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 08:45 and 09:00 on 8 May 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 westbound between J7 and J8 | Westbound | Road Works
Fri, 08 May 2026 08:21:19 GMT
M4 Roadworks
Location : The M4 westbound between junctions J7 and J8 . Lane Closures : Lanes 1 and 2 will be closed. Reason : Litter clearance is planned. Status : Pending. Schedule : From 21:00 on 8 May 2026 to 06:00 on 9 May 2026. Lanes Closed : There will be two of four lanes closed.

Map of M4 Motorway Junctions

West M4

East M4

How Do I Find M4 Traffic News?

Latest M4 News