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 J19 eastbound exit | Eastbound | Broken down vehicle
Wed, 15 Apr 2026 11:01:56 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound exit slip at junction J19 . Reason : Broken down vehicle. Status : Currently Active. Time To Clear : The event is expected to clear between 12:30 and 12:45 on 15 April 2026. Lanes Closed : There are lane closures.

M4 J15 eastbound exit | Eastbound | Congestion
Wed, 15 Apr 2026 10:35:19 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound exit slip at junction J15 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 11:30 and 11:45 on 15 April 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 westbound between J17 and J18 | Westbound | Road Works
Wed, 15 Apr 2026 07:13:18 GMT
M4 Roadworks
Location : The M4 westbound between junctions J17 and J18 . Reason : Roadworks are planned. Status : Pending. Schedule : From 08:00 on 24 April 2026 to 17:00 on 24 April 2026.

M4 westbound between J17 and J18 | Westbound | Road Works
Wed, 15 Apr 2026 07:13:18 GMT
M4 Roadworks
Location : The M4 westbound between junctions J17 and J18 . Lane Closures : Lane one will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : Expect disruption everyday between 08:00 and 16:00 from 22 April 2026 to 23 April 2026. Schedule : From 08:00 on 27 April 2026 to 16:00 on 27 April 2026. Lanes Closed : There will be one of three lanes closed.

M4 westbound between J17 and J18 | Westbound | Road Works
Wed, 15 Apr 2026 07:13:18 GMT
M4 Roadworks
Location : The M4 westbound between junctions J17 and J18 . Reason : Roadworks scheme is planned. Status : Pending. Schedule : From 08:00 on 22 April 2026 to 16:00 on 27 April 2026.

Map of M4 Motorway Junctions

West M4

East M4

How Do I Find M4 Traffic News?

Latest M4 News