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M4 J4B traffic

Right now at M4 J4B: 1 broken-down vehicle.

Updated 03:27 UK time · at J4B and the stretches either side

View on the live map All M4 traffic

Right now

M4 eastbound · J4B–J4

Broken-down vehicle

since 01:23 (2 h 4 min)

Motorway signs ×2
Timeline · 5 updates
1. 00:58 Motorway signs: “REPORT OF OBSTRUCTION”
2. 01:29 Motorway signs: “STRANDED VEHICLE”
3. 01:53 Motorway signs no longer show “REPORT OF OBSTRUCTION”
4. 02:53 Motorway signs: “REPORT OF OBSTRUCTION” (reported again)
5. 02:53 Motorway signs no longer show “STRANDED VEHICLE”

Closures tonight

No closures planned at J4B tonight.

Planned closures: next 7 days

Saturday 7 November

Clockwise J4B22:00–05:30Link road closed

Sunday 8 November

Clockwise J4B22:30–05:30Link road closed

The last 90 days

Incidents

87

Collisions

5

Road closed

1time

Typical time to clear

45 minmedian of 81

Busiest time

14:00–15:00

Recent incidents

M4 crash J4B–J5 westboundThu 07:13 · cleared after 41 min
M4 crash J4B–J5 westbound22 Oct 2026 09:55 · cleared after 4 h 33 min
M4 crash J4 eastbound17 Oct 2026 23:21 · cleared after 2 h 11 min
M4 reported crash J4–J4B westbound16 Oct 2026 05:29 · cleared after 1 h 21 min
M4 stopped traffic J4–J4B westbound14 Oct 2026 06:51 · cleared after 2 h 54 min
M4 crash J4–J4B westbound25 Sept 2026 08:09 · cleared after 447 h 52 min

Junctions either side

Every M4 junction

Common questions

Is the M4 closed at junction 4B right now?

No incidents have closed it right now.

Is M4 J4B closed tonight?

No closures are planned at J4B tonight. 2 are planned over the next 7 days (listed above).

How many crashes have there been at M4 J4B?

5 collisions reported at or either side of J4B in the last 90 days, the latest on 29 Oct 2026 at 07:13.

Includes incidents at J4B and on the stretches either side of it. Sources: National Highways, TomTom, TfL and Traffic Wales. Times are UK time.