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 within J4B | Eastbound | Congestion
Tue, 07 Apr 2026 11:41:30 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound at junction J4B . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 12:45 and 13:00 on 7 April 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 eastbound between J17 and J16 | Eastbound | Broken down vehicle
Tue, 07 Apr 2026 11:28:11 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J17 and J16 . 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 13:30 and 13:45 on 7 April 2026. Lanes Closed : There is one of three lanes closed.

M4 eastbound between J10 and J8 | Eastbound | Broken down vehicle
Tue, 07 Apr 2026 07:31:47 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 09:15 and 09:30 on 7 April 2026. Return To Normal : Normal traffic conditions are expected between 09:15 and 09:30 on 7 April 2026. Lanes Closed : There is one of four lanes closed.

connector at M4 J4/M4 spur (Heathrow) | Eastbound | Congestion
Tue, 07 Apr 2026 08:10:23 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound exit slip at junction J4 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 09:15 and 09:30 on 7 April 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 westbound between J2 and J3 | Westbound | Road Works
Tue, 07 Apr 2026 10:13:47 GMT
M4 Roadworks
Location : The M4 westbound between junctions J2 and J3 . Lane Closures : Lanes 1 and 2 will be closed. Reason : Emergency barrier repairs are planned. Status : Pending. Schedule : From 22:00 on 13 April 2026 to 05:30 on 14 April 2026. Lanes Closed : There will be two of three lanes closed.

Map of M4 Motorway Junctions

West M4

East M4

How Do I Find M4 Traffic News?

Latest M4 News