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 westbound between J12 and J13 | Westbound | Road Works
Fri, 13 Mar 2026 11:43:02 GMT
M4 Roadworks
Location : The M4 westbound between junctions J12 and J13 . Lane Closures : Lanes 1 and 2 will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : From 20:00 on 13 March 2026 to 06:00 on 14 March 2026. Lanes Closed : There will be two of three lanes closed.

M4 J2 westbound exit | Westbound | Congestion
Fri, 13 Mar 2026 10:47:19 GMT
M4 Current Traffic Incidents
Location : The M4 westbound exit slip at junction J2 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 10:45 and 11:00 on 13 March 2026.

M4 eastbound between J15 and J14 | Eastbound | Broken down vehicle
Fri, 13 Mar 2026 10:37:28 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J15 and J14 . 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 11:30 and 11:45 on 13 March 2026. Return To Normal : Normal traffic conditions are expected between 11:30 and 11:45 on 13 March 2026. Lanes Closed : There is one of three lanes closed.

link road from M25 J15 clockwise to M4 J4B eastbound | Eastbound | Flooding
Fri, 13 Mar 2026 10:43:30 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound entry slip at junction J4B from the M25 clockwise. Reason : Flooding. Status : Currently Active. Time To Clear : The event is expected to clear between 12:00 and 12:15 on 13 March 2026. Lanes Closed : There are lane closures.

M4 westbound within J2 | Westbound | Congestion
Fri, 13 Mar 2026 10:42:51 GMT
M4 Current Traffic Incidents
Location : The M4 westbound between junctions J1 and J2 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 10:45 and 11:00 on 13 March 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