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 J4 eastbound exit | Eastbound | Congestion
Wed, 17 Jun 2026 07:29:41 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 08:30 and 08:45 on 17 June 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 J4 eastbound exit | Eastbound | Congestion
Wed, 17 Jun 2026 06:48:30 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 07:45 and 08:00 on 17 June 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 J4 eastbound exit | Eastbound | Congestion
Wed, 17 Jun 2026 06:20:26 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 07:15 and 07:30 on 17 June 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 eastbound between J5 and J4B | Eastbound | Broken down vehicle
Wed, 17 Jun 2026 06:22:33 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J5 and J4B . 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 08:00 and 08:15 on 17 June 2026. Return To Normal : Normal traffic conditions are expected between 08:00 and 08:15 on 17 June 2026. Lanes Closed : There is one of five lanes closed.

M4 eastbound between J6 and J5 | Eastbound | Congestion
Wed, 17 Jun 2026 06:41:28 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J6 and J5 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 07:45 and 08:00 on 17 June 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