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 J18 westbound exit | Westbound | Congestion
Wed, 01 Apr 2026 12:41:18 GMT
M4 Current Traffic Incidents
Location : The M4 westbound exit slip at junction J18 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 13:45 and 14:00 on 1 April 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 westbound between J4B and J5 | Westbound | Broken down vehicle
Wed, 01 Apr 2026 11:16:16 GMT
M4 Current Traffic Incidents
Location : The M4 westbound between junctions J4B 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 13:00 and 13:15 on 1 April 2026. Lanes Closed : There is one of four lanes closed.

M4 J6 westbound access | Westbound | Road Works
Wed, 01 Apr 2026 10:31:49 GMT
M4 Roadworks
Location : The M4 westbound entry slip at junction J6 . Lane Closures : Lanes 1 and 2 will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : From 21:00 on 13 April 2026 to 06:00 on 14 April 2026. Schedule : Expect disruption everyday between 21:00 and 06:00 from 28 April 2026 to 30 April 2026. Lanes Closed : All lanes will be closed.

M4 westbound between J6 and J7 | Westbound | Road Works
Wed, 01 Apr 2026 10:31:48 GMT
M4 Roadworks
Location : The M4 westbound between junctions J5 and J7 . Reason : Roadworks scheme is planned. Status : Pending. Schedule : From 20:00 on 13 April 2026 to 06:00 on 30 April 2026.

M4 westbound between J6 and J7 | Westbound | Road Works
Wed, 01 Apr 2026 10:31:49 GMT
M4 Roadworks
Location : The M4 westbound between junctions J6 and J7 . Lane Closures : Lanes 1, 2 and 3 will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : From 20:00 on 13 April 2026 to 21:01 on 14 April 2026. Schedule : Expect disruption everyday between 20:00 and 06:00 from 28 April 2026 to 30 April 2026. Lanes Closed : There will be three of four lanes closed.

Map of M4 Motorway Junctions

West M4

East M4

How Do I Find M4 Traffic News?

Latest M4 News