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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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The most recent accident or incident on the M4 that we are aware of.
Roadworks live on the M4 right now.
The next planned roadworks scheduled on the M4.
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M4 both directions Jct 15 to 22 - mobile lane closure
Time now: Monday, 13 July 2026, 17:2517:1813 Jul 2026reported 6 min ago
- Location
- M4 eastbound between J18 and J17
- Direction
- Both directions
- Lanes closed
- Lane closures
- Reason
- Maintenance work
- Schedule
- 20:00 Mon 13 Jul → 06:00 Tue 14 Jul
Forecast — not confirmed
🚧HA scheduled: 20:00 Mon 13 Jul → 06:00 Tue 14 Jul starts in about 3 hours · lasts ~10h 00m
Updated 17:25, Mon 13 Jul 2026
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