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 westbound between J5 and J6 | Westbound | Broken down vehicle
Sat, 02 May 2026 05:18:03 GMT
M4 Current Traffic Incidents
Location : The M4 westbound between junctions J5 and J6 . 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 07:00 and 07:15 on 2 May 2026. Return To Normal : Normal traffic conditions are expected between 07:00 and 07:15 on 2 May 2026. Lanes Closed : There is one of four lanes closed.

M4 eastbound within J3 | Eastbound | Congestion
Sat, 02 May 2026 01:25:23 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound at junction J3 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 02:30 and 02:45 on 2 May 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 eastbound within J6 | Eastbound | Road Works
Fri, 01 May 2026 20:17:42 GMT
M4 Roadworks
Location : The M4 eastbound at junction J6 . Lane Closures : Lanes 1 and 2 will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : From 21:00 on 8 May 2026 to 06:00 on 9 May 2026. Lanes Closed : There will be two of three lanes closed.

M4 eastbound between J17 and J16 | Eastbound | Road Works
Fri, 01 May 2026 20:21:32 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 : From 21:00 on 8 May 2026 to 06:00 on 9 May 2026. Lanes Closed : There will be one of three lanes closed.

M4 eastbound between J2 and J1 | Eastbound | Road Works
Fri, 01 May 2026 23:36:11 GMT
M4 Roadworks
Location : The M4 eastbound between junctions J3 and J1 . Reason : Roadworks. Status : Currently Active. Period : from 00:34 on 1 May 2026 to 06:00 on 2 May 2026. Lanes Closed : All lanes are closed.

Map of M4 Motorway Junctions

West M4

East M4

How Do I Find M4 Traffic News?

Latest M4 News