M4 Roadworks
This page brings together the latest M4 roadworks — lane closures, overnight closures, contraflows and speed restrictions along the M4 motorway, from London through Bristol and across the Severn into South Wales. Roadworks are one of the most common causes of M4 delays, so it’s worth a quick check here before you travel.
Latest M4 roadworks
9 matching items - showing 1-9 of 9 total available news items
Hardshoulder closure
08:0016 Sept 2026reported just now
- 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 July 2027
M4 Westbound Jct 4B exit slip road lane 1 closure
08:0016 Sept 2026reported just now
- Location
- link road from M4 J4B westbound to M25 J15
- Direction
- Westbound
- Lanes closed
- Slip road closed
- Reason
- Roadworks
- Schedule
- 22:00 Wed 16 Sept 2026 → 05:30 Thu 17 Sept 2026
Forecast - not confirmed
M4 eastbound Jct 22 to Jct 21 lane closure 195/1-192/1
08:0016 Sept 2026reported just now
- Location
- M4 eastbound between J22 and J21
- Direction
- Eastbound
- Lanes closed
- Lane closures
- Reason
- Maintenance work
- Schedule
- 20:00 Wed 16 Sept 2026 → 06:00 Thu 17 Sept 2026
Forecast - not confirmed
lane 1 closure
08:0016 Sept 2026reported just now
- Location
- M4 eastbound between J18 and J17
- Direction
- Eastbound
- Lanes closed
- Lane closures
- Reason
- Tree and vegetation cutting work
- Schedule
- 08:00 Wed 16 Sept 2026 → 15:00 Wed 16 Sept 2026
Forecast - not confirmed
single lane running
08:0016 Sept 2026reported just now
- Location
- M4 eastbound between J19 and J18
- Direction
- Eastbound
- Lanes closed
- Restriction
- Reason
- Maintenance work
- Schedule
- 20:00 Wed 16 Sept 2026 → 06:00 Thu 17 Sept 2026
Forecast - not confirmed
M4 eastbound Jct 10 exit slip road closure
08:0016 Sept 2026reported just now
- Location
- link road from M4 J10 eastbound to A329(M)
- Direction
- Eastbound
- Lanes closed
- Carriageway closed
- Reason
- Maintenance work
- Schedule
- 21:00 Wed 16 Sept 2026 → 06:00 Thu 17 Sept 2026
Forecast - not confirmed
M4 eastbound lane 1 and 2 closure (59/3 to 57/3)
08:0016 Sept 2026reported just now
- Location
- M4 eastbound between J11 and J10
- Direction
- Eastbound
- Lanes closed
- Lane closures
- Reason
- Maintenance work
- Schedule
- 21:00 Wed 16 Sept 2026 → 06:00 Thu 17 Sept 2026
Forecast - not confirmed
M4 both directions Jct 15 to 22 - mobile lane closure
08:0016 Sept 2026reported just now
- Location
- M4 eastbound between J18 and J17
- Direction
- Both directions
- Lanes closed
- Lane closures
- Reason
- Maintenance work
- Schedule
- 20:00 Wed 16 Sept 2026 → 06:00 Thu 17 Sept 2026
Forecast - not confirmed
M4 eastbound lane 1 closure (99/4 to 95/4)
08:0016 Sept 2026reported just now
- Location
- M4 eastbound between J14 and J13
- Direction
- Eastbound
- Lanes closed
- Lane closures
- Reason
- Maintenance work
- Schedule
- 20:00 Wed 16 Sept 2026 → 06:00 Thu 17 Sept 2026
Forecast - not confirmed
Updated 08:02 Wed 16 Sept 2026
Powered by National Highways’ Transport Data Feeds.
Planning around M4 roadworks
Major M4 works — including smart-motorway sections and Severn-area maintenance — often run overnight, when lanes or whole sections may be closed and diversions put in place. Where you can, check the affected junctions, allow extra time, or plan an alternative route. For live updates across the whole motorway see our Latest M4 Traffic News page, and use the M4 junction map to find your junction.
Why M4 roadworks and lane closures happen at night
Why is so much M4 motorway work done in the small hours, and why do the same roadworks take so many nights? The Department for Transport’s hourly M4 traffic counts answer it.
11,543
M4 traffic, busiest hour
past junction 4 at 7am, both directions — 192 vehicles a minute. Closing an M4 lane at that hour removes capacity the traffic cannot make up.
8,717
in the quietest hour
and even the quietest counted daytime hour on the M4 is 145 a minute. There is no daylight window quiet enough to close an M4 lane without causing delays.
11,167
lorries a day at Bristol
on the M4 at the M4/M5 interchange. Overnight M4 roadworks keep that freight moving to South Wales and the South West during the day, when it has to be somewhere.
81
M4 count points
monitor this motorway end to end, which is how National Highways decide where and when M4 lane closures cause least disruption.
So the M4 roadworks you see coned off at two in the morning with nobody in them are usually the safest and least disruptive way to do the job. The alternative is not fewer M4 roadworks — it is the same roadworks at four in the afternoon. The latest M4 roadworks and lane closure updates for today are on this page, refreshed through the day.
Hourly figures are from the Department for Transport’s own M4 count point beside junction 4, counted on 3 September 2025, published 20 May 2026. Daily figures are Average Annual Daily Flow for 2025.