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.

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M4 eastbound within J15 | Eastbound | Road Works
Thu, 21 May 2026 19:19:08 GMT
M4 Roadworks
Location : The M4 eastbound at junction J15 . Reason : Roadside drains works are planned. Status : Pending. Schedule : From 20:00 on 28 May 2026 to 06:00 on 29 May 2026.

M4 eastbound between J14 and J13 | Eastbound | Road Works
Thu, 21 May 2026 19:26:28 GMT
M4 Roadworks
Location : The M4 eastbound between junctions J14 and J13 . Lane Closures : Lane one will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : From 20:00 on 28 May 2026 to 06:00 on 29 May 2026. Lanes Closed : There will be one of three lanes closed.

M4 eastbound between J20 and J19 | Eastbound | Accident
Thu, 21 May 2026 17:41:55 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J20 and J19 . Lane Closures : Lanes 2 and 3 are closed. Reason : Road traffic collision. Status : Currently Active. Lanes Closed : There are two of three lanes closed.

M4 eastbound within J20 | Eastbound | Congestion
Thu, 21 May 2026 17:46:43 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound at junction J20 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 18:45 and 19:00 on 21 May 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 westbound within J1 | Westbound | Congestion
Thu, 21 May 2026 18:41:22 GMT
M4 Current Traffic Incidents
Location : The M4 westbound at junction J1 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 19:45 and 20:00 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