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 within J5 | Westbound | Broken down vehicle
Mon, 23 Feb 2026 16:28:57 GMT
M4 Current Traffic Incidents
Location : The M4 westbound at junction J5 . Lane Closures : Lane three is closed. Reason : Broken down vehicle. Status : Currently Active. Time To Clear : The event is expected to clear between 17:30 and 17:45 on 23 February 2026. Return To Normal : Normal traffic conditions are expected between 17:30 and 17:45 on 23 February 2026. Lanes Closed : There is one of three lanes closed.

M4 westbound between J5 and J6 | Westbound | Spillage
Mon, 23 Feb 2026 16:23:19 GMT
M4 Current Traffic Incidents
Location : The M4 westbound between junctions J5 and J6 . Lane Closures : The hard shoulder, lanes 1 and 2 are closed. Reason : Load spillage. Status : Currently Active. Time To Clear : The event is expected to clear between 18:15 and 18:30 on 23 February 2026. Return To Normal : Normal traffic conditions are expected between 18:15 and 18:30 on 23 February 2026. Lanes Closed : There are two of four lanes closed.

M4 eastbound at the Heston services slip road between J3 and J2 | Eastbound | Road Works
Mon, 23 Feb 2026 14:15:44 GMT
M4 Roadworks
Location : The M4 eastbound entry slip at Heston Services. Reason : Emergency barrier repairs are planned. Status : Pending. Schedule : From 22:00 on 23 February 2026 to 05:00 on 24 February 2026. Lanes Closed : All lanes will be closed.

M4 eastbound at the Heston services slip road between J3 and J2 | Eastbound | Road Works
Mon, 23 Feb 2026 14:15:45 GMT
M4 Roadworks
Location : The M4 eastbound exit slip at Heston Services. Reason : Emergency barrier repairs are planned. Status : Pending. Schedule : From 22:00 on 23 February 2026 to 05:00 on 24 February 2026. Lanes Closed : All lanes will be closed.

M4 J2 eastbound access | Eastbound | Road Works
Mon, 23 Feb 2026 14:15:44 GMT
M4 Roadworks
Location : The M4 eastbound entry slip at junction J2 . Reason : Emergency barrier repairs are planned. Status : Pending. Schedule : From 22:00 on 23 February 2026 to 05:00 on 24 February 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