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 J17 and J16 | Eastbound | Road Works
Thu, 26 Mar 2026 13:03:25 GMT
M4 Roadworks
Location : The M4 eastbound between junctions J17 and J16 . Lane Closures : The hard shoulder is closed. Reason : Barrier repairs. Status : Currently Active. Period : expect disruption until 16:00 on 26 March 2026.

M4 eastbound between J4 and J3 | Eastbound | Congestion
Thu, 26 Mar 2026 11:04:31 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J4 and J3 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 11:00 and 11:15 on 26 March 2026. Delay : There are currently delays of 15 minutes against expected traffic.

M4 eastbound between J4 and J3 | Eastbound | Congestion
Thu, 26 Mar 2026 10:14:49 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J4B and J3 . Reason : Congestion. Status : Currently Active. Delay : There are currently delays of 10 minutes against expected traffic.

M4 J4 eastbound access | Eastbound | Congestion
Thu, 26 Mar 2026 10:23:16 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound entry slip at junction J4 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 10:15 and 10:30 on 26 March 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 westbound between J8 and J10 | Westbound | Broken down vehicle
Thu, 26 Mar 2026 10:38:42 GMT
M4 Current Traffic Incidents
Location : The M4 westbound between junctions J8 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 11:15 and 11:30 on 26 March 2026. Return To Normal : Normal traffic conditions are expected between 11:15 and 11:30 on 26 March 2026. Lanes Closed : There is one of four lanes closed.

Map of M4 Motorway Junctions

West M4

East M4

How Do I Find M4 Traffic News?

Latest M4 News