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 J19 westbound exit | Westbound | Congestion
Mon, 30 Mar 2026 15:58:31 GMT
M4 Current Traffic Incidents
Location : The M4 westbound exit slip at junction J19 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 17:00 and 17:15 on 30 March 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 J3 eastbound exit | Eastbound | Broken down vehicle
Mon, 30 Mar 2026 15:58:45 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound exit slip at junction J3 . 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 30 March 2026. Return To Normal : Normal traffic conditions are expected between 17:30 and 17:45 on 30 March 2026. Lanes Closed : There is one of three lanes closed.

M4 westbound between J19 and J20 | Westbound | Road Works
Mon, 30 Mar 2026 14:29:43 GMT
M4 Roadworks
Location : The M4 westbound between junctions J19 and J20 . Lane Closures : Lanes 2 and 3 will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : From 21:00 on 14 April 2026 to 06:00 on 15 April 2026. Lanes Closed : There will be two of three lanes closed.

M4 eastbound between J16 and J15 | Eastbound | Vehicle Recovery
Mon, 30 Mar 2026 14:56:01 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J16 and J15 . Lane Closures : The hard shoulder and lane 1 are closed. Reason : Vehicle tyre change. Status : Currently Active. Time To Clear : The event is expected to clear between 16:30 and 16:45 on 30 March 2026. Lanes Closed : There is one of three lanes closed.

M4 J13 eastbound access | Eastbound | Congestion
Mon, 30 Mar 2026 15:58:31 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound entry slip at junction J13 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 17:00 and 17:15 on 30 March 2026. Delay : There are currently delays of 10 minutes against expected traffic.

Map of M4 Motorway Junctions

West M4

East M4

How Do I Find M4 Traffic News?

Latest M4 News