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 between J13 and J14 | Westbound | Congestion
Sun, 26 Apr 2026 09:50:12 GMT
M4 Current Traffic Incidents
Location : The M4 westbound between junctions J13 and J14 . Reason : Congestion. Status : Currently Active. Delay : There are currently delays of 15 minutes against expected traffic.

M4 eastbound between J10 and J8 | Eastbound | Broken down vehicle
Sun, 26 Apr 2026 08:47:03 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J10 and J8 . 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 10:30 and 10:45 on 26 April 2026. Return To Normal : Normal traffic conditions are expected between 10:30 and 10:45 on 26 April 2026. Lanes Closed : There is one of four lanes closed.

M4 J14 westbound access | Westbound | Accident
Sun, 26 Apr 2026 02:36:26 GMT
M4 Current Traffic Incidents
Location : The M4 westbound entry slip at junction J14 . Reason : Road traffic collision. Status : Currently Active. Time To Clear : The event is expected to clear between 06:30 and 06:45 on 26 April 2026. Lanes Closed : All lanes are closed.

M4 eastbound between J4B and J4 | Eastbound | Broken down vehicle
Sun, 26 Apr 2026 04:22:02 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J4B and J4 . 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 06:00 and 06:15 on 26 April 2026. Return To Normal : Normal traffic conditions are expected between 06:00 and 06:15 on 26 April 2026. Lanes Closed : There is one of five lanes closed.

M4 J12 eastbound exit | Eastbound | Congestion
Sun, 26 Apr 2026 08:49:23 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound exit slip at junction J12 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 09:45 and 10:00 on 26 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