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 eastbound between J14 and J13 | Eastbound | Accident
Sat, 09 May 2026 21:36:06 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J14 and J13 . Lane Closures : Lanes 2 and 3 are closed. Reason : Road traffic collision. Status : Currently Active. Time To Clear : The event is expected to clear between 23:30 and 23:45 on 9 May 2026. Return To Normal : Normal traffic conditions are expected between 23:30 and 23:45 on 9 May 2026. Lanes Closed : There are two of three lanes closed.

M4 J18 eastbound exit | Eastbound | Congestion
Sat, 09 May 2026 16:45:27 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 17:45 and 18:00 on 9 May 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 eastbound between J10 and J8 | Eastbound | Broken down vehicle
Sat, 09 May 2026 16:04:42 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 17:45 and 18:00 on 9 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