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
Thu, 23 Apr 2026 08:12:40 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 09:15 and 09:30 on 23 April 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 J8 westbound exit | Westbound | Broken down vehicle
Thu, 23 Apr 2026 07:41:40 GMT
M4 Current Traffic Incidents
Location : The M4 westbound exit slip at junction J8 . Lane Closures : Lane one is closed. Reason : Broken down vehicle. Status : Currently Active. Time To Clear : The event is expected to clear between 09:15 and 09:30 on 23 April 2026. Return To Normal : Normal traffic conditions are expected between 09:15 and 09:30 on 23 April 2026. Lanes Closed : There is one of two lanes closed.

M4 westbound between J15 and J16 | Westbound | Road Works
Thu, 23 Apr 2026 06:14:06 GMT
M4 Roadworks
Location : The M4 westbound between junctions J15 and J16 . Reason : Roadworks are planned. Status : Pending. Schedule : From 07:00 on 30 April 2026 to 17:00 on 30 April 2026.

M4 westbound between J4B and J5 | Westbound | Accident
Thu, 23 Apr 2026 06:31:05 GMT
M4 Current Traffic Incidents
Location : The M4 westbound between junctions J4B and J5 . Lane Closures : Lane four is closed. Reason : Road traffic collision. Status : Currently Active. Time To Clear : The event is expected to clear between 08:30 and 08:45 on 23 April 2026. Return To Normal : Normal traffic conditions are expected between 08:30 and 08:45 on 23 April 2026. Lanes Closed : There is one of four lanes closed.

M4 J11 eastbound exit | Eastbound | Congestion
Thu, 23 Apr 2026 07:20:37 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound exit slip at junction J11 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 08:15 and 08:30 on 23 April 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