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Latest M4 Traffic News and Updates
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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.
-
Hardshoulder closure
Time now: Tuesday, 14 July 2026, 18:1018:0014 Jul 2026reported 9 min ago
- Location
- M4 eastbound between J17 and J16
- Direction
- Eastbound
- Lanes closed
- Hard shoulder closed
- Reason
- Roadworks
- Schedule
- 23:59 Tue 27 Apr 2021 → 18:00 Fri 30 Jul 2027
⏳Long-term works — HA planned end: 18:00 Fri 30 Jul 2027.
The next planned roadworks scheduled on the M4.
-
M4 eastbound lane 1 closure (71/8 to 65/9) and exit slip
Time now: Tuesday, 14 July 2026, 18:1018:0014 Jul 2026reported 9 min ago
- Location
- M4 eastbound between J12 and J11
- Direction
- Eastbound
- Lanes closed
- Slip road closed
- Reason
- Maintenance work
- Schedule
- 20:00 Tue 14 Jul → 06:00 Wed 15 Jul
Forecast — not confirmed
🚧HA scheduled: 20:00 Tue 14 Jul → 06:00 Wed 15 Jul starts in about 2 hours · lasts ~10h 00m
Updated 18:10, Tue 14 Jul 2026
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