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 J3 and J2 | Eastbound | Congestion
Thu, 16 Apr 2026 11:57:21 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J3 and J2 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 13:00 and 13:15 on 16 April 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 eastbound between J3 and J2 | Eastbound | Accident
Thu, 16 Apr 2026 12:00:00 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J3 and J2 . Lane Closures : Lane one is closed. Reason : Road traffic collision. Status : Currently Active. Time To Clear : The event is expected to clear between 14:00 and 14:15 on 16 April 2026. Return To Normal : Normal traffic conditions are expected between 14:00 and 14:15 on 16 April 2026. Lanes Closed : There is one of two lanes closed.

M4 westbound within J15 | Westbound | Road Works
Thu, 16 Apr 2026 11:52:33 GMT
M4 Roadworks
Location : The M4 westbound between junctions J14 and J15 . Reason : Roadside drains works are planned. Status : Pending. Schedule : From 21:00 on 17 April 2026 to 06:00 on 18 April 2026.

M4 J15 westbound exit | Westbound | Road Works
Thu, 16 Apr 2026 11:52:33 GMT
M4 Roadworks
Location : The M4 westbound exit slip at junction J15 . Lane Closures : Lanes 1 and 2 will be closed. Reason : Roadside drains works are planned. Status : Pending. Schedule : From 21:00 on 17 April 2026 to 06:00 on 18 April 2026. Lanes Closed : All lanes will be closed.

M4 eastbound within J22 | Eastbound | Road Works
Thu, 16 Apr 2026 11:53:12 GMT
M4 Roadworks
Location : The M4 eastbound at junction J22 . Lane Closures : Lanes 1 and 2 will be closed. Reason : Road repairs are planned. Status : Pending. Schedule : From 21:00 on 21 April 2026 to 06:00 on 22 April 2026. Lanes Closed : All lanes will be closed.

Map of M4 Motorway Junctions

West M4

East M4

How Do I Find M4 Traffic News?

Latest M4 News