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 J11 and J12 | Westbound | Road Works
Sun, 28 Jun 2026 04:16:49 GMT
M4 Roadworks
Location : The M4 westbound between junctions J11 and J12 . Lane Closures : The hard shoulder, lanes 1 and 2 are closed. Reason : Emergency road repairs. Status : Currently Active. Period : from 05:05 on 28 June 2026 to 10:00 on 28 June 2026. Lanes Closed : There are two of four lanes closed.

M4 westbound between J2 and J3 | Westbound | Vehicle Fire
Sun, 28 Jun 2026 00:10:40 GMT
M4 Current Traffic Incidents
Location : The M4 westbound between junctions J2 and J3 . Lane Closures : The hard shoulder and lane 1 are closed. Reason : Vehicle fire. Status : Currently Active. Time To Clear : The event is expected to clear between 02:00 and 02:15 on 28 June 2026. Return To Normal : Normal traffic conditions are expected between 02:00 and 02:15 on 28 June 2026. Lanes Closed : There is one of three lanes closed.

M4 eastbound between J18 and J17 | Eastbound | Congestion
Sat, 27 Jun 2026 14:11:32 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J18 and J17 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 15:15 and 15:30 on 27 June 2026. Delay : There are currently delays of 20 minutes against expected traffic.

M4 eastbound between J3 and J2 | Eastbound | Congestion
Sat, 27 Jun 2026 14:51:27 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 15:45 and 16:00 on 27 June 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 eastbound between J6 and J5 | Eastbound | Broken down vehicle
Sat, 27 Jun 2026 18:00:40 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J6 and J5 . 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 19:30 and 19:45 on 27 June 2026. Return To Normal : Normal traffic conditions are expected between 19:30 and 19:45 on 27 June 2026. Lanes Closed : There is one of four lanes closed.

Map of M4 Motorway Junctions

West M4

East M4

How Do I Find M4 Traffic News?

Latest M4 News