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 J10 and J8 | Eastbound | Broken down vehicle
Thu, 16 Apr 2026 21:29:01 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J10 and J8 . Lane Closures : The hard shoulder and lane 1 are closed. Reason : Broken down vehicle. Status : Currently Active. Time To Clear : The event is expected to clear between 23:00 and 23:15 on 16 April 2026. Return To Normal : Normal traffic conditions are expected between 23:00 and 23:15 on 16 April 2026. Lanes Closed : There is one of four lanes closed.

M4 eastbound between J5 and J4B | Eastbound | Road Works
Thu, 16 Apr 2026 21:12:00 GMT
M4 Roadworks
Location : The M4 eastbound between junctions J5 and J4B . Lane Closures : Lanes 1 and 2 will be closed. Reason : Emergency barrier repairs are planned. Status : Pending. Schedule : From 23:00 on 23 April 2026 to 05:30 on 24 April 2026. Lanes Closed : There will be two of five lanes closed.

M4 westbound within J19 | Westbound | Congestion
Thu, 16 Apr 2026 20:21:19 GMT
M4 Current Traffic Incidents
Location : The M4 westbound at junction J19 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 21:15 and 21:30 on 16 April 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 J15 westbound exit | Westbound | Road Works
Thu, 16 Apr 2026 20:15:49 GMT
M4 Roadworks
Location : The M4 westbound exit slip at junction J15 . Lane Closures : Lane one will be closed. Reason : Horticultural works are planned. Status : Pending. Schedule : From 21:00 on 23 April 2026 to 06:00 on 24 April 2026. Lanes Closed : There will be one of two lanes closed.

M4 J19 westbound access | Westbound | Congestion
Thu, 16 Apr 2026 20:36:18 GMT
M4 Current Traffic Incidents
Location : The M4 westbound entry slip at junction J19 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 21:30 and 21:45 on 16 April 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