Crash View

M4 road closures today & tonight

Updated . The live feeds are checked every five minutes.

No live incident closures on the M4 right now, but 3 roadworks are currently in force.

6 closures are scheduled tonight (18:00 to 06:00).

Is the M4 closed? Live updates from National Highways and Traffic Wales: accidents and emergency closures happening today, overnight closures tonight, roadworks in force and planned closures for the week ahead, filterable by direction.

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Live incident
Active roadworks
Planned
Cleared
Hover or tap markers for full details

Filter M4 closures by direction

M4 closures tonight

Closures starting between 18:00 on Thursday 15 October and 06:00 the next morning (UK time), including any already in force.

No closures in this direction tonight.

M4 roadworks in force now

None in this direction right now.

Recently cleared on the M4

M4 closure history: the last 12 months

Since 15 October 2025, 2,260 closures have been recorded on the M4: 2,260 planned roadworks and 0 unplanned incidents. 93% started overnight (18:00 to 06:00), and a typical closure lasted 8 hours 45 minutes. The busiest stretch was J22 to J23 (178 closures), and Tuesday was the busiest day of the week.

Roadworks & planned closures
2,260
Unplanned incidents
0
Started overnight
93%
Typical duration
8 hours 45 minutes
Average 8 hours 15 minutes

Busiest M4 sections

  1. J22 to J23 178
  2. J17 to J18 175
  3. J16 to J17 164
  4. J18 to J19 151
  5. J12 to J13 115

When closures happen

Busiest day
Tuesday
Busiest month
July 2026 (291)
Overnight closures
2,099

Busiest months: July 2026 (291), August 2026 (265), September 2026 (230).

Closures by direction

Eastbound
2,019
Westbound
201
Clockwise
40

M4 crash history

1,152 injury collisions were recorded on the M4 between 2021 and 2025: 36 fatal, 171 serious and 945 slight, involving 1,746 casualties. The Department for Transport publishes STATS19 once a year, so 2025 is the latest year available and today's crashes appear above as live incidents instead.

Collisions
1,152
Fatal
36
Serious
171
Slight
945
M4 crash history: map & every recorded collision

M4 closures: your questions answered

Is the M4 closed today?

Yes. As of 20:01 UK time the M4 has 3 roadworks in force, including roadworks (eastbound, J8); roadworks (eastbound, J11 to J12). Check the list above for each closure and its expected reopening time.

Is the M4 closed tonight?

Yes, 6 closures on the M4 are scheduled to start between 18:00 on Thursday 15 October and 06:00 the next morning, including roadworks (eastbound, J8) from 20:00; roadworks (westbound, J16 to J17) from 20:00; roadworks (eastbound, J11 to J12) from 20:00.

Why is the M4 closed?

Current M4 closures are for maintenance work, sweeping of road, construction work. Over the last 12 months, 100% of the 2,260 closures recorded on the M4 were planned roadworks and none were unplanned incidents; 93% started overnight.

Where does this data come from?

Live M4 closures come from the National Highways road closure feed for England's motorways and major A roads and from Traffic Wales, checked every five minutes. Closure history is built from that feed's archive. Collision figures come from the Department for Transport's STATS19 road safety data, which is published once a year, so recent crashes appear here as live incidents long before they reach the official statistics.

Get an email when the M4 closes

An instant alert for incidents, plus a short note each afternoon if closures are planned overnight. Free for one road.

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All live closures M4 closure archive M4 crash history