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?

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M4 westbound between J19 and J20 | Westbound | Road Works
Thu, 18 Sep 2025 22:36:25 GMT
M4 Roadworks
Location : The M4 westbound between junctions J19 and J20 . Reason : Roadworks. Status : Currently Active. Period : from 23:35 on 18 September 2025 to 05:00 on 19 September 2025. Lanes Closed : All lanes are closed.

link road from M5 J16 northbound to M4 J20 eastbound | Eastbound | Road Works
Thu, 18 Sep 2025 22:33:22 GMT
M4 Roadworks
Location : The M4 eastbound entry slip at junction J20 from M5 north. Reason : Roadworks. Status : Currently Active. Period : from 23:32 on 18 September 2025 to 05:00 on 19 September 2025. Lanes Closed : All lanes are closed.

connector at M4 J4/M4 spur (Heathrow) | Eastbound | Congestion
Thu, 18 Sep 2025 21:15:24 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound exit slip at junction J4 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 22:15 and 22:30 on 18 September 2025.

link road from M5 J15 southbound to M4 J20 eastbound | Eastbound | Congestion
Thu, 18 Sep 2025 22:11:22 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound entry slip at junction J20 from M5 south. Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 23:15 and 23:30 on 18 September 2025. Delay : There are currently delays of 10 minutes against expected traffic.

M4 westbound within J20 | Westbound | Congestion
Thu, 18 Sep 2025 22:22:22 GMT
M4 Current Traffic Incidents
Location : The M4 westbound at junction J20 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 23:15 and 23:30 on 18 September 2025. 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