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 eastbound within J20 | Eastbound | Congestion
Tue, 28 Apr 2026 07:29:22 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound at junction J20 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 08:30 and 08:45 on 28 April 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 eastbound at the Heston services between J3 and J2 | Eastbound | Congestion
Tue, 28 Apr 2026 07:22:00 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 09:00 and 09:15 on 28 April 2026. Delay : There are currently delays of 10 minutes against expected traffic. Earlier Reason : Caused by the earlier broken down vehicle.

M4 eastbound between J6 and J5 | Eastbound | Broken down vehicle
Tue, 28 Apr 2026 07:00:25 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J6 and J5 . Lane Closures : The hard shoulder, lanes 1 and 2 are closed. Reason : Broken down vehicle. Status : Currently Active. Time To Clear : The event is expected to clear between 08:30 and 08:45 on 28 April 2026. Lanes Closed : There are two of four lanes closed.

M4 J3 eastbound exit | Eastbound | Broken down vehicle
Tue, 28 Apr 2026 07:12:04 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound exit slip at junction J3 . Reason : Broken down vehicle. Status : Currently Active. Time To Clear : The event is expected to clear between 08:45 and 09:00 on 28 April 2026. Return To Normal : Normal traffic conditions are expected between 08:45 and 09:00 on 28 April 2026. Lanes Closed : There are lane closures.

M4 eastbound between J22 and J21 | Eastbound | Congestion
Tue, 28 Apr 2026 07:08:43 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J22 and J21 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 08:15 and 08:30 on 28 April 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