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 J12 and J13 | Westbound | Road Works
Sun, 07 Jun 2026 20:08:40 GMT
M4 Roadworks
Location : The M4 westbound between junctions J12 and J13 . Lane Closures : Lane three is closed. Reason : Emergency barrier repairs. Status : Currently Active. Period : from 21:07 on 7 June 2026 to 06:00 on 8 June 2026. Lanes Closed : There is one of three lanes closed.

M4 eastbound between J13 and J12 | Eastbound | Road Works
Sun, 07 Jun 2026 20:05:35 GMT
M4 Roadworks
Location : The M4 eastbound between junctions J13 and J12 . Lane Closures : Lane three is closed. Reason : Emergency barrier repairs. Status : Currently Active. Period : from 21:04 on 7 June 2026 to 06:00 on 8 June 2026. Lanes Closed : There is one of three lanes closed.

M4 westbound between J12 and J13 | Westbound | RoadOrCarriagewayOrLaneManagement
Sun, 07 Jun 2026 18:58:19 GMT
M4 Current Traffic Incidents
Location : The M4 westbound between junctions J12 and J13 . Lane Closures : Lane three is closed. Reason : Road Management. Status : Currently Active. Time To Clear : The event is expected to clear between 21:00 and 21:15 on 7 June 2026. Return To Normal : Normal traffic conditions are expected between 21:00 and 21:15 on 7 June 2026. Lanes Closed : There is one of three lanes closed.

M4 eastbound between J13 and J12 | Eastbound | Congestion
Sun, 07 Jun 2026 19:21:22 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J13 and J12 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 20:15 and 20:30 on 7 June 2026. Delay : There are currently delays of 30 minutes against expected traffic.

M4 eastbound between J8 and J7 | Eastbound | Resurfacing
Sun, 07 Jun 2026 20:01:14 GMT
M4 Roadworks
Location : The M4 eastbound between junctions J8 and J7 . Lane Closures : Lanes 3 and 4 are closed. Reason : Emergency resurfacing. Status : Currently Active. Period : from 21:00 on 7 June 2026 to 06:00 on 8 June 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