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 J10 and J8 | Eastbound | Broken down vehicle
Sun, 08 Mar 2026 23:52:24 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J10 and J8 . 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 00:30 and 00:45 on 9 March 2026. Return To Normal : Normal traffic conditions are expected between 00:30 and 00:45 on 9 March 2026. Lanes Closed : There is one of four lanes closed.

M4 westbound between J4B and J5 | Westbound | Broken down vehicle
Sun, 08 Mar 2026 13:50:25 GMT
M4 Current Traffic Incidents
Location : The M4 westbound between junctions J4B and J5 . 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 14:30 and 14:45 on 8 March 2026. Return To Normal : Normal traffic conditions are expected between 14:30 and 14:45 on 8 March 2026. Lanes Closed : There is one of four lanes closed.

connector at M4 J4/M4 spur (Heathrow) | Eastbound | Congestion
Sun, 08 Mar 2026 07:35:27 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound exit slip at junction J4 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 07:30 and 07:45 on 8 March 2026.

M4 westbound between J8 and J10 | Westbound | Road Works
Sun, 08 Mar 2026 07:44:41 GMT
M4 Roadworks
Location : The M4 westbound between junctions J8 and J10 . Lane Closures : The hard shoulder and lane 1 are closed. Reason : Emergency barrier repairs. Status : Currently Active. Period : from 07:42 on 8 March 2026 to 12:00 on 8 March 2026. Lanes Closed : There is one of four lanes closed.

M4 J4 eastbound access | Eastbound | Broken down vehicle
Sun, 08 Mar 2026 12:23:25 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound entry slip at junction J4 . 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 13:00 and 13:15 on 8 March 2026. Return To Normal : Normal traffic conditions are expected between 13:00 and 13:15 on 8 March 2026. Lanes Closed : There is one of two lanes closed.

Map of M4 Motorway Junctions

West M4

East M4

How Do I Find M4 Traffic News?

Latest M4 News