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 J8 westbound access | Westbound | Congestion
Thu, 09 Apr 2026 23:32:21 GMT
M4 Current Traffic Incidents
Location : The M4 westbound entry slip at junction J8 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 00:30 and 00:45 on 10 April 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 westbound between J19 and J20 | Westbound | Congestion
Thu, 09 Apr 2026 20:42:27 GMT
M4 Current Traffic Incidents
Location : The M4 westbound between junctions J19 and J20 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 21:45 and 22:00 on 9 April 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 J22 westbound access | Westbound | Road Works
Thu, 09 Apr 2026 20:17:15 GMT
M4 Roadworks
Location : The M4 westbound entry slip at junction J22 . Reason : Roadworks are planned. Status : Pending. Schedule : From 21:00 on 16 April 2026 to 06:00 on 17 April 2026. Lanes Closed : All lanes will be closed.

M4 eastbound between J17 and J16 | Eastbound | Road Works
Thu, 09 Apr 2026 20:13:58 GMT
M4 Roadworks
Location : The M4 eastbound between junctions J17 and J16 . Lane Closures : Lane one will be closed. Reason : Horticultural works are planned. Status : Pending. Schedule : Expect disruption everyday between 21:00 and 06:00 from 16 April 2026 to 18 April 2026. Lanes Closed : There will be one of three lanes closed.

M4 eastbound between J16 and J15 | Eastbound | Road Works
Thu, 09 Apr 2026 20:30:35 GMT
M4 Roadworks
Location : The M4 eastbound between junctions J16 and J15 . Lane Closures : Lane one will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : From 21:00 on 16 April 2026 to 06:00 on 17 April 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