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 J12 and J13 | Westbound | Accident
Sun, 22 Mar 2026 04:51:37 GMT
M4 Current Traffic Incidents
Location : The M4 westbound between junctions J12 and J13 . Lane Closures : The hard shoulder and lane 1 are closed. Reason : Road traffic collision. Status : Currently Active. Time To Clear : The event is expected to clear between 05:45 and 06:00 on 22 March 2026. Return To Normal : Normal traffic conditions are expected between 05:45 and 06:00 on 22 March 2026. Lanes Closed : There is one of three lanes closed.

M4 westbound between J1 and J2 | Westbound | Broken down vehicle
Sun, 22 Mar 2026 04:03:35 GMT
M4 Current Traffic Incidents
Location : The M4 westbound between junctions J1 and J2 . Reason : Broken down vehicle. Status : Currently Active. Time To Clear : The event is expected to clear between 04:45 and 05:00 on 22 March 2026. Return To Normal : Normal traffic conditions are expected between 04:45 and 05:00 on 22 March 2026. Lanes Closed : All lanes are closed.

link road from M25 J15 clockwise to M4 J4B eastbound | Eastbound | Road Works
Sat, 21 Mar 2026 22:17:10 GMT
M4 Roadworks
Location : The M4 eastbound entry slip at junction J4B from the M25 clockwise. Lane Closures : Lane one will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : From 22:00 on 28 March 2026 to 05:30 on 29 March 2026. Schedule : From 22:30 on 29 March 2026 to 05:30 on 30 March 2026. Lanes Closed : All lanes will be closed.

link road from M25 J15 clockwise to M4 J4B westbound | Westbound | Road Works
Sat, 21 Mar 2026 22:17:10 GMT
M4 Roadworks
Location : The M4 westbound entry slip at junction J4B from M25 clockwise. Lane Closures : Lane one will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : From 22:00 on 28 March 2026 to 05:30 on 29 March 2026. Schedule : From 22:30 on 29 March 2026 to 05:30 on 30 March 2026. Lanes Closed : All lanes will be closed.

M4 eastbound between J19 and J18 | Eastbound | Accident
Sun, 22 Mar 2026 02:24:35 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J19 and J18 . Reason : Road traffic collision. Status : Currently Active. Time To Clear : The event is expected to clear between 03:30 and 03:45 on 22 March 2026. Return To Normal : Normal traffic conditions are expected between 03:30 and 03:45 on 22 March 2026. Lanes Closed : There are lane closures.

Map of M4 Motorway Junctions

West M4

East M4

How Do I Find M4 Traffic News?

Latest M4 News