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 J8 and J7 | Eastbound | Broken down vehicle
Wed, 25 Mar 2026 14:37:41 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J8 and J7 . 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 15:15 and 15:30 on 25 March 2026. Return To Normal : Normal traffic conditions are expected between 15:15 and 15:30 on 25 March 2026. Lanes Closed : There is one of four lanes closed.

M4 westbound between J5 and J6 | Westbound | Accident
Wed, 25 Mar 2026 14:38:43 GMT
M4 Current Traffic Incidents
Location : The M4 westbound between junctions J5 and J6 . 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 15:45 and 16:00 on 25 March 2026. Return To Normal : Normal traffic conditions are expected between 15:45 and 16:00 on 25 March 2026. Lanes Closed : There is one of four lanes closed.

M4 eastbound between J11 and J10 | Eastbound | Broken down vehicle
Wed, 25 Mar 2026 12:52:24 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J11 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 13:30 and 13:45 on 25 March 2026. Return To Normal : Normal traffic conditions are expected between 13:30 and 13:45 on 25 March 2026. Lanes Closed : There is one of four lanes closed.

link road from M25 J15 anti-clockwise to M4 J4B westbound | Westbound | Accident
Wed, 25 Mar 2026 13:37:41 GMT
M4 Current Traffic Incidents
Location : The M4 westbound entry slip at junction J4B from the M25 anti-clockwise. Reason : Road traffic collision. Status : Currently Active. Time To Clear : The event is expected to clear between 14:30 and 14:45 on 25 March 2026. Return To Normal : Normal traffic conditions are expected between 14:30 and 14:45 on 25 March 2026. Lanes Closed : There are lane closures.

M4 eastbound between J5 and J4B | Eastbound | Broken down vehicle
Wed, 25 Mar 2026 14:34:49 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J5 and J4B . Lane Closures : The hard shoulder and lane 1 are closed. Reason : Broken down vehicle. Status : Currently Active. Lanes Closed : There is one of five lanes closed.

Map of M4 Motorway Junctions

West M4

East M4

How Do I Find M4 Traffic News?

Latest M4 News