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?

Simply type the search words in the search facility towards the top right of this page and click "search".

M4 J12 eastbound exit | Eastbound | Congestion
Tue, 30 Dec 2025 03:51:17 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 03:45 and 04:00 on 30 December 2025. Delay : There are currently delays of 10 minutes against expected traffic.

M4 eastbound between J6 and J5 | Eastbound | Accident
Tue, 30 Dec 2025 02:10:44 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 : Road traffic collision. Status : Currently Active. Time To Clear : The event is expected to clear between 04:00 and 04:15 on 30 December 2025. Return To Normal : Normal traffic conditions are expected between 04:00 and 04:15 on 30 December 2025. Lanes Closed : There are two of four lanes closed.

M4 eastbound at the Heston services slip road between J3 and J2 | Eastbound | Road Works
Mon, 29 Dec 2025 22:17:08 GMT
M4 Roadworks
Location : The M4 eastbound entry slip at Heston Services. Reason : Road repairs are planned. Status : Pending. Schedule : Expect disruption everyday between 22:00 and 05:30 from 5 January 2026 to 9 January 2026. Schedule : From 23:00 on 9 January 2026 to 06:00 on 10 January 2026. Lanes Closed : All lanes will be closed.

link road from M25 J15 anti-clockwise to M4 J4B westbound | Westbound | Road Works
Mon, 29 Dec 2025 22:21:57 GMT
M4 Roadworks
Location : The M4 westbound entry slip at junction J4B from the M25 anti-clockwise. Lane Closures : Lane one will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : From 22:00 on 5 January 2026 to 05:30 on 6 January 2026. Schedule : Expect disruption everyday between 22:00 and 05:30 from 7 January 2026 to 9 January 2026. Schedule : From 23:00 on 9 January 2026 to 06:00 on 10 January 2026. Schedule : Expect disruption everyday between 22:00 and 05:30 from 12 January 20...

link road from M25 J15 anti-clockwise to M4 J4B eastbound | Eastbound | Road Works
Mon, 29 Dec 2025 22:21:57 GMT
M4 Roadworks
Location : The M4 eastbound entry slip at junction J4B from the M25 anti-clockwise. Lane Closures : Lanes 1 and 2 will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : From 22:00 on 5 January 2026 to 05:30 on 6 January 2026. Schedule : Expect disruption everyday between 22:00 and 05:30 from 7 January 2026 to 9 January 2026. Schedule : From 23:00 on 9 January 2026 to 06:00 on 10 January 2026. Schedule : Expect disruption everyday between 22:00 and 05:30 from 12 Janua...

Map of M4 Motorway Junctions

West M4

East M4

How Do I Find M4 Traffic News?

Latest M4 News