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 J6 westbound exit | Westbound | Congestion
Sun, 17 May 2026 03:54:21 GMT
M4 Current Traffic Incidents
Location : The M4 westbound exit slip at junction J6 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 04:45 and 05:00 on 17 May 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 westbound within J4 | Westbound | Broken down vehicle
Sat, 16 May 2026 22:24:10 GMT
M4 Current Traffic Incidents
Location : The M4 westbound at junction 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 00:00 and 00:15 on 17 May 2026. Return To Normal : Normal traffic conditions are expected between 00:00 and 00:15 on 17 May 2026. Lanes Closed : There is one of four lanes closed.

M4 westbound between J12 and J13 | Westbound | Vehicle Fire
Sat, 16 May 2026 13:44:10 GMT
M4 Current Traffic Incidents
Location : The M4 westbound between junctions J12 and J13 . Lane Closures : The hard shoulder, lanes 1 and 2 are closed. Reason : Vehicle fire. Status : Currently Active. Time To Clear : The event is expected to clear between 15:45 and 16:00 on 16 May 2026. Return To Normal : Normal traffic conditions are expected between 15:45 and 16:00 on 16 May 2026. Lanes Closed : There are two of three lanes closed.

M4 J12 eastbound exit | Eastbound | Congestion
Sat, 16 May 2026 16:41:15 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 17:45 and 18:00 on 16 May 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 westbound between J5 and J6 | Westbound | Accident
Sat, 16 May 2026 18:03:13 GMT
M4 Current Traffic Incidents
Location : The M4 westbound between junctions J5 and J6 . Lane Closures : The hard shoulder, lanes 1 and 4 are closed. Reason : Road traffic collision. Status : Currently Active. Time To Clear : The event is expected to clear between 20:00 and 20:15 on 16 May 2026. Return To Normal : Normal traffic conditions are expected between 20:00 and 20:15 on 16 May 2026. Lanes Closed : There are two of four lanes closed.

Map of M4 Motorway Junctions

West M4

East M4

How Do I Find M4 Traffic News?

Latest M4 News