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 J18 and J19 | Westbound | Road Works
Fri, 27 Mar 2026 21:13:10 GMT
M4 Roadworks
Location : The M4 westbound between junctions J18 and J19 . Reason : Roadworks. Status : Currently Active. Period : from 21:12 on 27 March 2026 to 06:00 on 28 March 2026. Lanes Closed : All lanes are closed.

M4 westbound within J20 | Westbound | Congestion
Fri, 27 Mar 2026 18:18:29 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 18:15 and 18:30 on 27 March 2026. Delay : There are currently delays of 10 minutes against expected traffic.

link road from M5 J15 to M4 J20 westbound | Westbound | Congestion
Fri, 27 Mar 2026 16:57:25 GMT
M4 Current Traffic Incidents
Location : The M4 westbound entry slip at junction J20 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 17:00 and 17:15 on 27 March 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 J19 westbound exit | Westbound | Congestion
Fri, 27 Mar 2026 17:36:21 GMT
M4 Current Traffic Incidents
Location : The M4 westbound exit slip at junction J19 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 17:30 and 17:45 on 27 March 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 eastbound between J3 and J2 | Eastbound | Congestion
Fri, 27 Mar 2026 18:16:24 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 18:15 and 18:30 on 27 March 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