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 J13 and J12 | Eastbound | Road Works
Mon, 21 Apr 2025 19:20:46 GMT
M4 Roadworks
Location : The M4 eastbound between junctions J13 and J12 . Lane Closures : Lane one will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : From 20:00 on 28 April 2025 to 06:00 on 29 April 2025. Lanes Closed : There will be one of three lanes closed.

M4 westbound between J17 and J18 | Westbound | Road Works
Mon, 21 Apr 2025 19:24:12 GMT
M4 Roadworks
Location : The M4 westbound between junctions J17 and J18 . Lane Closures : Lanes 1 and 2 will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : From 20:00 on 28 April 2025 to 06:00 on 29 April 2025. Lanes Closed : There will be two of three lanes closed.

M4 westbound between J8 and J10 | Westbound | Accident
Mon, 21 Apr 2025 18:26:19 GMT
M4 Current Traffic Incidents
Location : The M4 westbound between junctions J8 and J10 . Lane Closures : The hard shoulder and lane 1 are closed. Reason : Road traffic collision. Status : Currently Active. Time To Clear : The event is expected to clear between 20:30 and 20:45 on 21 April 2025. Return To Normal : Normal traffic conditions are expected between 20:30 and 20:45 on 21 April 2025. Lanes Closed : There is one of four lanes closed.

M4 J22 westbound access | Westbound | Congestion
Mon, 21 Apr 2025 18:43:18 GMT
M4 Current Traffic Incidents
Location : The M4 westbound entry slip at junction J22 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 19:45 and 20:00 on 21 April 2025. Delay : There are currently delays of 10 minutes against expected traffic.

M4 westbound within J22 | Westbound | Congestion
Mon, 21 Apr 2025 18:40:19 GMT
M4 Current Traffic Incidents
Location : The M4 westbound at junction J22 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 19:45 and 20:00 on 21 April 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