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 J11 eastbound exit | Eastbound | Congestion
Thu, 26 Feb 2026 17:25:52 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound exit slip at junction J11 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 17:30 and 17:45 on 26 February 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 westbound between J12 and J13 | Westbound | Road Works
Thu, 26 Feb 2026 16:51:54 GMT
M4 Roadworks
Location : The M4 westbound between junctions J12 and J13 . Reason : Barrier repairs are planned. Status : Pending. Schedule : From 09:00 on 2 March 2026 to 16:00 on 2 March 2026.

M4 eastbound between J6 and J5 | Eastbound | Accident
Thu, 26 Feb 2026 14:39:36 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J6 and J5 . Lane Closures : Lanes 3 and 4 are closed. Reason : Road traffic collision. Status : Currently Active. Time To Clear : The event is expected to clear between 15:45 and 16:00 on 26 February 2026. Lanes Closed : There are two of four lanes closed.

M4 eastbound within J6 | Eastbound | Congestion
Thu, 26 Feb 2026 15:11:41 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound at junction J6 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 15:15 and 15:30 on 26 February 2026. Cause : Road traffic collision. Delay : There are currently delays of 10 minutes against expected traffic.

M4 J6 eastbound access | Eastbound | Congestion
Thu, 26 Feb 2026 15:10:45 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound entry slip at junction J6 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 15:15 and 15:30 on 26 February 2026. 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