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 J12 eastbound access | Eastbound | AuthorityOperation
Mon, 01 Jun 2026 19:39:29 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound entry slip at junction J12 . Reason : Police incident. Status : Currently Active. Time To Clear : The event is expected to clear between 22:00 and 22:15 on 1 June 2026. Return To Normal : Normal traffic conditions are expected between 22:00 and 22:15 on 1 June 2026. Lanes Closed : All lanes are closed.

M4 eastbound between J15 and J14 | Eastbound | Road Works
Mon, 01 Jun 2026 19:35:59 GMT
M4 Roadworks
Location : The M4 eastbound between junctions J15 and J14 . Lane Closures : Lane one will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : From 20:00 on 8 June 2026 to 06:00 on 9 June 2026. Lanes Closed : There will be one of three lanes closed.

M4 eastbound within J7 | Eastbound | Congestion
Mon, 01 Jun 2026 18:00:20 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound at junction J7 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 19:00 and 19:15 on 1 June 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 eastbound between J12 and J11 | Eastbound | AuthorityOperation
Mon, 01 Jun 2026 18:44:30 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J12 and J11 . Reason : Police incident. Status : Currently Active. Time To Clear : The event is expected to clear between 21:00 and 21:15 on 1 June 2026. Return To Normal : Normal traffic conditions are expected between 21:00 and 21:15 on 1 June 2026. Lanes Closed : All lanes are closed.

M4 J12 eastbound exit | Eastbound | Congestion
Mon, 01 Jun 2026 19:13:55 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound exit slip at junction J12 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 20:15 and 20:30 on 1 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