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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link road from M5 J16 northbound to M4 J20 eastbound | Eastbound | Congestion
Tue, 12 May 2026 15:36:38 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound entry slip at junction J20 from M5 north. Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 16:30 and 16:45 on 12 May 2026. Delay : There are currently delays of 10 minutes against expected traffic.

connector at M4 J4/M4 spur (Heathrow) | Eastbound | Congestion
Tue, 12 May 2026 13:59:21 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 15:00 and 15:15 on 12 May 2026.

M4 eastbound within J11 | Eastbound | Road Works
Tue, 12 May 2026 08:12:56 GMT
M4 Roadworks
Location : The M4 eastbound at junction J11 . Lane Closures : Lanes 1, 2 and 3 will be closed. Reason : Road repairs are planned. Status : Pending. Schedule : From 22:00 on 12 May 2026 to 06:00 on 13 May 2026. Lanes Closed : All lanes will be closed.

M4 J14 eastbound exit | Eastbound | Congestion
Tue, 12 May 2026 08:36:29 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound exit slip at junction J14 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 09:30 and 09:45 on 12 May 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 eastbound between J10 and J8 | Eastbound | Broken down vehicle
Tue, 12 May 2026 12:59:06 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J10 and J8 . Lane Closures : The hard shoulder and lane 1 are closed. Reason : Broken down vehicle. Status : Currently Active. Time To Clear : The event is expected to clear between 14:30 and 14:45 on 12 May 2026. Return To Normal : Normal traffic conditions are expected between 14:30 and 14:45 on 12 May 2026. Lanes Closed : There is one of four lanes closed.

Map of M4 Motorway Junctions

West M4

East M4

How Do I Find M4 Traffic News?

Latest M4 News