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 J7 eastbound exit | Eastbound | Congestion
Fri, 29 May 2026 16:30:45 GMT
M4 Current Traffic Incidents
Location : The junction of the M4 J7 and the A4 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 17:30 and 17:45 on 29 May 2026. Delay : There are currently delays of 10 minutes against expected traffic.

link road from M5 J15 to M4 J20 westbound | Westbound | Congestion
Fri, 29 May 2026 16:24:46 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 17:15 and 17:30 on 29 May 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 J18 eastbound exit | Eastbound | Congestion
Fri, 29 May 2026 14:56:52 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound exit slip at junction J18 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 16:00 and 16:15 on 29 May 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 J4 westbound exit | Westbound | Broken down vehicle
Fri, 29 May 2026 15:00:41 GMT
M4 Current Traffic Incidents
Location : The M4 westbound exit slip at junction J4 . Reason : Broken down vehicle. Status : Currently Active. Time To Clear : The event is expected to clear between 16:30 and 16:45 on 29 May 2026. Lanes Closed : There are lane closures.

link road from M5 J15 to M4 J20 westbound | Westbound | Congestion
Fri, 29 May 2026 15:02:22 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 16:00 and 16:15 on 29 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