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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link road from M25 J15 to M4 J4B eastbound | Eastbound | Congestion
Wed, 10 Jun 2026 21:19:17 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound entry slip at junction J4B . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 22:15 and 22:30 on 10 June 2026.

M4 westbound between J4 and J4B | Westbound | AuthorityOperation
Wed, 10 Jun 2026 21:03:35 GMT
M4 Current Traffic Incidents
Location : The M4 westbound between junctions J4 and J4B . Reason : Police incident. Status : Currently Active. Time To Clear : The event is expected to clear between 23:15 and 23:30 on 10 June 2026. Return To Normal : Normal traffic conditions are expected between 23:15 and 23:30 on 10 June 2026. Lanes Closed : There are lane closures.

M4 westbound within J19 | Westbound | Road Works
Wed, 10 Jun 2026 20:21:10 GMT
M4 Roadworks
Location : The M4 westbound between junctions J18 and J19 . Lane Closures : Lanes 2 and 3 will be closed. Reason : Roadside drains works are planned. Status : Pending. Schedule : Expect disruption everyday between 21:00 and 06:00 from 17 June 2026 to 19 June 2026. Lanes Closed : There will be two of three lanes closed.

M4 eastbound between J10 and J8 | Eastbound | Road Works
Wed, 10 Jun 2026 20:25:43 GMT
M4 Roadworks
Location : The M4 eastbound between junctions J10 and J8 . Lane Closures : Lanes 1 and 2 will be closed. Reason : Roadside drains works are planned. Status : Pending. Schedule : From 21:00 on 17 June 2026 to 06:00 on 18 June 2026. Lanes Closed : There will be two of four lanes closed.

M4 eastbound between J4B and J4 | Eastbound | AuthorityOperation
Wed, 10 Jun 2026 21:03:34 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J4B and J4 . Reason : Police incident. Status : Currently Active. Time To Clear : The event is expected to clear between 23:15 and 23:30 on 10 June 2026. Return To Normal : Normal traffic conditions are expected between 23:15 and 23:30 on 10 June 2026. Lanes Closed : There are lane closures.

Map of M4 Motorway Junctions

West M4

East M4

How Do I Find M4 Traffic News?

Latest M4 News