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 J18 and J19 | Westbound | Road Works
Mon, 23 Mar 2026 09:16:15 GMT
M4 Roadworks
Location : The M4 westbound between junctions J18 and J19 . Lane Closures : Lane three will be closed. Reason : Barrier repairs are planned. Status : Pending. Schedule : From 21:00 on 26 March 2026 to 06:00 on 27 March 2026. Lanes Closed : There will be one of three lanes closed.

M4 eastbound at the Heston services between J3 and J2 | Eastbound | Congestion
Mon, 23 Mar 2026 08:11:28 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J3 and J2 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 08:15 and 08:30 on 23 March 2026. Delay : There are currently delays of 15 minutes against expected traffic.

M4 eastbound between J3 and J2 | Eastbound | Congestion
Mon, 23 Mar 2026 07:56:55 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J4 and J2 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 07:45 and 08:00 on 23 March 2026. Cause : Vehicle fire. Delay : There are currently delays of 20 minutes against expected traffic.

M4 eastbound between J3 and J2 | Eastbound | Vehicle Fire
Mon, 23 Mar 2026 07:56:59 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J3 and J2 . 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 08:30 and 08:45 on 23 March 2026. Return To Normal : Normal traffic conditions are expected between 09:30 and 09:45 on 23 March 2026. Delay : There are currently delays of 20 minutes against expected traffic. Lanes Closed : There are lane closures.

M4 J7 eastbound exit | Eastbound | Congestion
Mon, 23 Mar 2026 07:58:17 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound exit slip at junction J7 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 08:00 and 08:15 on 23 March 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