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 J19 and J18 | Eastbound | Vehicle Fire
Sat, 18 Apr 2026 06:00:00 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J19 and J18 . Lane Closures : The hard shoulder and lane 1 are closed. Reason : Vehicle fire. Status : Currently Active. Time To Clear : The event is expected to clear between 07:30 and 07:45 on 18 April 2026. Return To Normal : Normal traffic conditions are expected between 07:30 and 07:45 on 18 April 2026. Lanes Closed : There is one of three lanes closed.

M4 J19 westbound access | Westbound | Congestion
Fri, 17 Apr 2026 21:52:21 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 22:45 and 23:00 on 17 April 2026. Delay : There are currently delays of 10 minutes against expected traffic.

link road from A329(M) eastbound to M4 J10 eastbound | Eastbound | Road Works
Fri, 17 Apr 2026 21:25:24 GMT
M4 Roadworks
Location : The M4 eastbound entry slip at junction J10 . Reason : Roadworks. Status : Currently Active. Period : from 22:24 on 17 April 2026 to 06:00 on 18 April 2026. Lanes Closed : All lanes are closed.

M4 westbound between J8 and J10 | Westbound | Broken down vehicle
Fri, 17 Apr 2026 21:37:59 GMT
M4 Current Traffic Incidents
Location : The M4 westbound between junctions J8 and J10 . 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 23:15 and 23:30 on 17 April 2026. Return To Normal : Normal traffic conditions are expected between 23:15 and 23:30 on 17 April 2026. Lanes Closed : There is one of four lanes closed.

link road from M4 J10 eastbound to A329(M) | Eastbound | Road Works
Fri, 17 Apr 2026 21:32:17 GMT
M4 Roadworks
Location : The M4 eastbound exit slip at junction J10 . Reason : Roadworks. Status : Currently Active. Period : from 22:31 on 17 April 2026 to 06:00 on 18 April 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