M4 Traffic News
Latest M4 Traffic News and Updates
M4 Roadworks Information
M4 Traffic Delays M4 Accidents
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.
-
M4 eastbound Jct 19 to Jct 18 lane 3&2 leading to hardshoulder running (179/7 to 175/4)
Time now: Monday, 20 July 2026, 21:2021:1920 Jul 2026reported just now
- Location
- M4 eastbound between J19 and J18
- Direction
- Eastbound
- Lanes closed
- Hard shoulder closed
- Reason
- Roadworks
- Schedule
- 20:05 Mon 20 Jul → 06:00 Tue 21 Jul
⏳Expected to clear in ~8h 39m HA planned end: 06:00 Tue 21 Jul
The next planned roadworks scheduled on the M4.
-
M4 eastbound Jct 11 to Jct 10 carriageway closure
Time now: Monday, 20 July 2026, 21:2021:1920 Jul 2026reported just now
- Location
- M4 eastbound within J11
- Direction
- Eastbound
- Lanes closed
- Carriageway closed
- Reason
- Roadworks
- Schedule
- 21:00 Mon 20 Jul → 06:00 Tue 21 Jul
Forecast — not confirmed
🚧HA scheduled: 21:00 Mon 20 Jul → 06:00 Tue 21 Jul underway until 06:00 Tue 21 Jul
Updated 21:20, Mon 20 Jul 2026
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