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 J19 westbound access | Westbound | Congestion
Thu, 21 May 2026 22:08:22 GMT
M4 Current Traffic Incidents
Location : The M4 westbound entry slip at junction J19 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 23:00 and 23:15 on 21 May 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 eastbound between J14 and J13 | Eastbound | AuthorityOperation
Thu, 21 May 2026 21:47:20 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J14 and J13 . Reason : Police incident. Status : Currently Active. Time To Clear : The event is expected to clear between 00:00 and 00:15 on 22 May 2026. Return To Normal : Normal traffic conditions are expected between 00:00 and 00:15 on 22 May 2026. Lanes Closed : There are lane closures.

M4 westbound within J22 | Westbound | Congestion
Thu, 21 May 2026 20:52:26 GMT
M4 Current Traffic Incidents
Location : The M4 westbound at junction J22 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 21:45 and 22:00 on 21 May 2026. Delay : There are currently delays of 10 minutes against expected traffic.

connector at A408/M4 J4/M4 spur (Heathrow) | Eastbound | Road Works
Thu, 21 May 2026 21:15:01 GMT
M4 Roadworks
Location : The M4 eastbound. Lane Closures : Lane three will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : From 22:00 on 28 May 2026 to 05:30 on 29 May 2026. Schedule : From 23:00 on 29 May 2026 to 06:00 on 30 May 2026. Lanes Closed : There will be one of three lanes closed.

M4 J19 westbound access | Westbound | Congestion
Thu, 21 May 2026 21:36:28 GMT
M4 Current Traffic Incidents
Location : The M4 westbound entry slip at junction J19 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 22:45 and 23:00 on 21 May 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