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 at the Leigh Delamere services slip road between J17 and J18 | Westbound | Road Works
Mon, 15 Dec 2025 23:06:05 GMT
M4 Roadworks
Location : The M4 westbound exit slip at Leigh Delamere Services. Reason : Roadworks. Status : Currently Active. Period : from 23:05 on 15 December 2025 to 00:30 on 16 December 2025. Lanes Closed : All lanes are closed.

M4 eastbound between J5 and J4B | Eastbound | Broken down vehicle
Mon, 15 Dec 2025 22:16:25 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. Time To Clear : The event is expected to clear between 23:00 and 23:15 on 15 December 2025. Return To Normal : Normal traffic conditions are expected between 23:00 and 23:15 on 15 December 2025. Lanes Closed : There is one of five lanes closed.

M4 eastbound within J6 | Eastbound | Congestion
Mon, 15 Dec 2025 17:46:36 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound at junction J6 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 17:45 and 18:00 on 15 December 2025. Delay : There are currently delays of 10 minutes against expected traffic.

M4 eastbound between J20 and J19 | Eastbound | Broken down vehicle
Mon, 15 Dec 2025 18:16:27 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J20 and J19 . Lane Closures : The hard shoulder is closed. Reason : Broken down vehicle. Status : Currently Active. Time To Clear : The event is expected to clear between 19:00 and 19:15 on 15 December 2025. Return To Normal : Normal traffic conditions are expected between 19:00 and 19:15 on 15 December 2025.

M4 westbound between J1 and J2 | Westbound | Road Works
Mon, 15 Dec 2025 22:04:45 GMT
M4 Roadworks
Location : The M4 westbound between junctions J1 and J2 . Reason : Roadworks. Status : Currently Active. Period : from 22:04 on 15 December 2025 to 05:00 on 16 December 2025. Lanes Closed : All lanes are closed.

Map of M4 Motorway Junctions

West M4

East M4

How Do I Find M4 Traffic News?

Latest M4 News