No incidents or lane closures reported at Thorney Interchange.
Thorney Interchange trafficM25 Junction 15 · M4 Junction 4B
ClearLive traffic and incident news for Thorney Interchange. Find out which lanes are closed and when, and keep moving through one of the busiest junctions on the M25.
Thorney Interchange is open, with no incidents or lane closures reported right now.
Last updated:
Incidents and lane closures now
Active road signs
Messages on National Highways electronic signs at or about Thorney Interchange, grouped into one row per unique message.
M4 CLOSED
AFTER A329M
READING (E)
On 5 signs
Showing since 07:36 · last set 12:13
M4 westbound (J4, J4B, J5)
M4 J10-J11
CLOSED
On 3 signs
Showing since 05:20 · last set 12:47
Shown across multiple roads:
- M25 anticlockwise (J15, J16) · 2 signs
- M25 clockwise (J14, J15)
M4 CLOSED J10-J11
M1 DELAYS J10-J11A
On 1 sign
Showing since 12:56
M25 clockwise (J14, J15)
M1 J10-J11A
LONG DELAYS
On 2 signs
Showing since 12:44
M25 clockwise (J15, J16)
QUEUE
CAUTION
On 2 signs
Showing since 12:55
Shown across multiple roads:
- M25 anticlockwise (J15, J16)
- M25 clockwise (J15, J16)
M25 DELAYS J13-J11
M1 DELAYS J10-J11A
On 1 sign
Showing since 12:56
M4 eastbound (J4B, J5)
M25 J13-J11
20 MINS DELAY
On 1 sign
Showing since 12:57
M4 eastbound (J4B, J5)
M1 J10-J11A
35 MINS DELAY
On 1 sign
Showing since 12:56
M4 eastbound (J4B, J5)
REPORT OF
COLLISION
On 3 signs
Showing since 12:43
M25 anticlockwise (J4B, J15)
J17 8 MINS
J19 12 MINS
J21 16 MINS
On 1 sign
Showing since 12:43
M25 clockwise (J15, J16)
J17 8 MINS
J19 12 MINS
J21 17 MINS
On 1 sign
Showing since 12:56
M25 clockwise (J15, J16)
Only messages a sign was set for today are shown. A sign left up from an earlier date may not reflect current conditions and is hidden here — always follow the signs and signals on the road itself.
Planned lane closures and roadworks
Scheduled closures at M25 J15 and M4 J4B over the next 7 days, with the times each one is in place.
M25 Anti-clockwise Jct 15 to M4 Eastbound and Westbound Jct 4B exit slip road and link road closure
PlannedCarriageway closures
- Tue 22 Sept, 22:00Wed 23 Sept, 05:30
- Wed 23 Sept, 22:00Thu 24 Sept, 05:30
- Thu 24 Sept, 22:00Fri 25 Sept, 05:30
- Fri 25 Sept, 23:00Sat 26 Sept, 06:00
Source: National Highways
M25 Anti-clockwise Jct 16 to Jct 15 lane 1,2 closure
PlannedOther
- Tue 22 Sept, 22:00Wed 23 Sept, 05:30
- Wed 23 Sept, 22:00Thu 24 Sept, 05:30
- Thu 24 Sept, 22:00Fri 25 Sept, 05:30
- Fri 25 Sept, 23:00Sat 26 Sept, 06:00
Source: National Highways
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Keep moving through Thorney Interchange
- Check before you set off. A single lane closure between M25 J14 and J16 can back traffic up onto the M4 link roads within minutes.
- Watch for overnight closures. Roadworks at the interchange are usually overnight. If you travel late, check the planned closures above for link road and slip road closures and their diversions.
- Allow extra time for Heathrow. Airport traffic joins and leaves at M25 J14 and M4 J4, either side of Thorney, so delays here often affect journeys to the terminals.
- Follow the overhead signs. A red X means the lane is closed. Variable speed limits are mandatory. The signs on the road always take priority over this page.
About Thorney Interchange
Thorney Interchange joins the M25 London Orbital and the M4 west of London, between West Drayton, Iver and Heathrow Airport. It is signed as M25 Junction 15 and M4 Junction 4B, and its free-flowing link roads carry traffic between the two motorways without a roundabout. With Heathrow on one side and the M40 a junction away, the M25 around Thorney is one of the busiest stretches of motorway in the UK.
| Nearby junction | For |
|---|---|
| M25 J14 | A3113 for Heathrow Terminals 4 and 5 |
| M25 J16 | M40 for Oxford and the A40 |
| M4 J4 | Heathrow Terminals 2 and 3, Hayes |
| M4 J5 | A4 for Colnbrook and Langley |
Thorney Interchange FAQs
Is Thorney Interchange closed today?
Thorney Interchange is open, with no incidents or lane closures reported right now. This page checks National Highways every few minutes.
Where is Thorney Interchange?
Thorney Interchange is where the M25 meets the M4, west of London near West Drayton, Iver and Heathrow Airport. It links M25 Junction 15 with M4 Junction 4B using free-flowing link roads, so traffic can change motorway without stopping at a roundabout.
Which junction numbers make up Thorney Interchange?
Thorney Interchange is M25 Junction 15 and M4 Junction 4B. Road signs, traffic reports and National Highways notices usually refer to it by these junction numbers rather than by name.
When are the lane closures at Thorney Interchange?
Planned lane closures and roadworks are usually scheduled overnight, when traffic is lightest. This page lists every scheduled closure window at Thorney Interchange for the next 7 days, with start and end times, so you can plan around them.
Where does this traffic information come from?
Incidents, lane closures and planned roadworks come from National Highways open data: the Road and Lane Closures feed, travel alerts, and the text shown on electronic motorway signs. Occasionally we add an update by hand when a closure is known but not yet published.