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 J14 westbound access | Westbound | Accident
Sun, 26 Apr 2026 02:36:26 GMT
M4 Current Traffic Incidents
Location : The M4 westbound entry slip at junction J14 . Reason : Road traffic collision. Status : Currently Active. Time To Clear : The event is expected to clear between 06:30 and 06:45 on 26 April 2026. Lanes Closed : All lanes are closed.

M4 westbound between J14 and J15 | Westbound | Accident
Sun, 26 Apr 2026 02:06:05 GMT
M4 Current Traffic Incidents
Location : The M4 westbound between junctions J14 and J15 . Reason : Road traffic collision. Status : Currently Active. Time To Clear : The event is expected to clear between 04:45 and 05:00 on 26 April 2026. Return To Normal : Normal traffic conditions are expected between 04:45 and 05:00 on 26 April 2026. Lanes Closed : There are lane closures.

M4 eastbound between J3 and J2 | Eastbound | Congestion
Sat, 25 Apr 2026 12:34:20 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J3 and J2 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 13:30 and 13:45 on 25 April 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 eastbound between J14 and J13 | Eastbound | Road Works
Sat, 25 Apr 2026 19:14:23 GMT
M4 Roadworks
Location : The M4 eastbound between junctions J14 and J13 . Lane Closures : Lanes 2 and 3 will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : Expect disruption everyday between 20:00 and 06:00 from 2 May 2026 to 4 May 2026. Lanes Closed : There will be two of three lanes closed.

M4 westbound between J13 and J14 | Westbound | Road Works
Sat, 25 Apr 2026 19:14:23 GMT
M4 Roadworks
Location : The M4 westbound between junctions J13 and J14 . Lane Closures : Lane three will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : Expect disruption everyday between 20:00 and 06:00 from 2 May 2026 to 4 May 2026. Lanes Closed : There will be one of three lanes closed.

Map of M4 Motorway Junctions

West M4

East M4

How Do I Find M4 Traffic News?

Latest M4 News