M4 J15 traffic

No incidents reported at M4 J15 right now.

Updated 03:28 UK time · at J15 and the stretches either side

View on the live map All M4 traffic

Right now

Nothing reported at M4 J15 at the moment.

Roadworks now

Eastbound J15–J14until 06:001 of 4 lanes closedM4 eastbound lane 3 closure (121/9 to 121/1)
Eastbound J15–J22until 06:001 of 4 lanes closedM4 both directions Jct 15 to 22 - mobile lane closure
Eastbound J15–J14until 06:00Exit slip road closedM4 eastbound Membury Services exit slip road closure
Eastbound J15–J14until 06:00Entry slip road closedM4 eastbound Membury Services entry slip road closure

Closures tonight

Eastbound J15–J1420:42–06:00Exit slip road closedM4 eastbound Membury Services exit slip road closure
Eastbound J15–J1420:42–06:00Entry slip road closedM4 eastbound Membury Services entry slip road closure

Planned closures: next 7 days

Tuesday 3 November

Eastbound J15–J1421:00–06:00Exit slip road closedM4 eastbound Membury Services exit slip road closure
Eastbound J15–J1421:00–06:00Entry slip road closedM4 eastbound Membury Services entry slip road closure

Wednesday 4 November

Westbound J14–J1521:00–06:00Exit slip road closedM4 westbound Membury Services exit slip road closure
Westbound J1521:00–06:00Entry slip road closed

Thursday 5 November

Westbound J14–J1521:00–06:00Exit slip road closedM4 westbound Membury Services exit slip road closure

Friday 6 November

Eastbound J1521:00–06:00Entry slip road closed

The last 90 days

Incidents

Collisions

Road closed

9times

Typical time to clear

59 minmedian of 46

Busiest time

16:00–17:00

Recent incidents

M4 closed J15–J16 westbound27 Oct 2026 23:51 · cleared after 5 h 59 min
M4 closed J15–J16 westbound27 Oct 2026 21:36 · cleared after 2 h 5 min
M4 closed J15–J16 westbound27 Oct 2026 20:10 · cleared after 50 min
M4 reported crash J15–J14 eastbound25 Oct 2026 07:05 · cleared after 1 h 28 min
M4 crash J15–J14 eastbound18 Oct 2026 18:24 · cleared after 1 h 36 min
M4 reported crash J15–J16 westbound18 Oct 2026 01:38 · cleared after 55 min
M4 closed J14–J15 westbound16 Oct 2026 21:09 · cleared after 2 h 5 min
M4 reported crash J15–J16 westbound10 Oct 2026 12:09 · cleared after 1 h 5 min
M4 reported crash J15–J14 eastbound9 Oct 2026 19:27 · cleared after 43 min
M4 reported crash J14–J15 westbound7 Oct 2026 14:02 · cleared after 46 min
M4 closed J15–J16 westbound6 Oct 2026 20:53 · cleared after 7 h 12 min
M4 closed J15–J16 westbound5 Oct 2026 20:18 · cleared after 7 h 48 min
M4 closed J15–J16 westbound30 Sept 2026 19:54 · cleared after 10 h 35 min
M4 closed J15–J16 westbound28 Sept 2026 22:40 · cleared after 5 h 37 min
M4 closed J15–J16 westbound27 Sept 2026 20:01 · cleared after 8 h 46 min

Junctions either side

Every M4 junction

Common questions

Is the M4 closed at junction 15 right now?

No incidents have closed it right now.

Is M4 J15 closed tonight?

National Highways has 2 closures planned here tonight: eastbound J15–J14 exit slip road closed 20:42–06:00; eastbound J15–J14 entry slip road closed 20:42–06:00.

How many crashes have there been at M4 J15?

6 collisions reported at or either side of J15 in the last 90 days, the latest on 25 Oct 2026 at 07:05.

Includes incidents at J15 and on the stretches either side of it. Sources: National Highways, TomTom, TfL and Traffic Wales. Times are UK time.