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 J18 eastbound exit | Eastbound | Congestion
Tue, 09 Jun 2026 00:13:18 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound exit slip at junction J18 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 01:15 and 01:30 on 9 June 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 eastbound between J4 and J3 | Eastbound | Congestion
Mon, 08 Jun 2026 21:40:17 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J4 and J3 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 22:45 and 23:00 on 8 June 2026. Delay : There are currently delays of 10 minutes against expected traffic.

link road from M5 J16 northbound to M4 J20 eastbound | Eastbound | Road Works
Mon, 08 Jun 2026 20:38:32 GMT
M4 Roadworks
Location : The M4 eastbound entry slip at junction J20 from M5 north. Lane Closures : Lanes 1 and 2 will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : From 21:00 on 15 June 2026 to 06:00 on 16 June 2026. Lanes Closed : All lanes will be closed.

M4 J14 eastbound access | Eastbound | Road Works
Mon, 08 Jun 2026 20:42:48 GMT
M4 Roadworks
Location : The M4 eastbound entry slip at junction J14 . Reason : Roadworks are planned. Status : Pending. Schedule : From 21:00 on 15 June 2026 to 06:00 on 16 June 2026. Lanes Closed : All lanes will be closed.

M4 eastbound between J4 and J3 | Eastbound | Road Works
Mon, 08 Jun 2026 21:17:15 GMT
M4 Roadworks
Location : The M4 eastbound between junctions J4B and J3 . Lane Closures : Lanes 1, 2, 3, 4 and 5 will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : From 22:00 on 15 June 2026 to 05:30 on 16 June 2026. Lanes Closed : All lanes will be closed.

Map of M4 Motorway Junctions

West M4

East M4

How Do I Find M4 Traffic News?

Latest M4 News