M4 westbound between J4 and J4B
Lane closedLane closures
Started: Expected to end: Source: National Highways
Thorney Interchange trafficM25 Junction 15 · M4 Junction 4B
ClosuresLive 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.
There are closures in place at Thorney Interchange right now. See the current incidents below for which carriageway, slip road or link road is affected.
Last updated:
Incidents and lane closures now
M25 Anti-clockwise Jct 16 to Jct 15 lane 4,3,2 closure
Other
Started: Expected to end: Source: National Highways
M4 Eastbound Jct 4B exit slip road closure
ClosedCarriageway closures
Started: Expected to end: Source: National Highways
M25 Anti-clockwise Jct 15 to Jct 14 Carriageway closure
ClosedCarriageway closures
Started: Expected to end: Source: National Highways
M4 Eastbound Jct 5 to Jct 4B lane 1,2 closure
Other
Started: Expected to end: Source: National Highways
M4 Westbound Jct 4B exit slip road lane 1 closure
Other
Started: Expected to end: Source: National Highways
M25 anti-clockwise between J16 and J15
ClosedM40 Eastbound and Westbound Jct 1A to M25 Clockwise and Anti-Clockwise Jct 16 Link Road Closure
Started: Expected to end: Source: National Highways
Active road signs
Messages on National Highways electronic signs at or about Thorney Interchange, grouped into one row per unique message.
M25 J20-J21A
CLOSED
On 3 signs
Showing since 21:55
M25 clockwise (J14, J15, J16)
M25 CLOSED
AFTER A41
HEMEL HEMPSTEAD
On 2 signs
Showing since 21:55
Shown across multiple roads:
- M4 eastbound (J4B, J5)
- M25 clockwise (J14, J15)
LANE CLOSURE
AHEAD[HCA3]
On 1 sign
Showing since 21:50
M4 westbound (J4, J4B)
WORKFORCE IN
ROAD - SLOW
On 2 signs
Showing since 21:52
M25 anticlockwise (J4B, J15, J16)
J17 7 MINS
J19 12 MINS
On 2 signs
Showing since 21:54
M25 clockwise (J15, J16)
WORKFORCE IN
ROAD[HCA3]
On 2 signs
Showing since 21:48
M4 westbound (J4, J4B)
ROADWORKS
AHEAD[HCA3]
On 1 sign
Showing since 21:46
M4 eastbound (J4B, J5)
END[HCA3]
On 1 sign
Showing since 21:46
M4 eastbound (J4B)
TO J13 STAINES
6 MILES
8 MINS
On 1 sign
Showing since 09:22
M25 anticlockwise (J15, J16)
J15 5 MINS
J14 6 MINS
On 1 sign
Showing since 21:42
M25 anticlockwise (J15, J16)
ROADWORKS[HCA3]
On 1 sign
Showing since 21:46
M4 eastbound (J4B)
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 16 to Jct 15 lane 4,3,2 closure
PlannedOther
- Thu 17 Sept, 22:00Fri 18 Sept, 05:30
- Fri 18 Sept, 23:00Sat 19 Sept, 06:00
Source: National Highways
M4 Westbound Jct 4B exit slip road lane 1 closure
PlannedOther
- Thu 17 Sept, 22:00Fri 18 Sept, 05:30
- Fri 18 Sept, 23:00Sat 19 Sept, 06:00
Source: National Highways
M25 Anti-clockwise Jct 15 to Jct 14 Carriageway closure
PlannedCarriageway closures
- Thu 17 Sept, 22:00Fri 18 Sept, 05:30
- Fri 18 Sept, 23:00Sat 19 Sept, 06:00
Source: National Highways
M4 Eastbound Jct 5 to Jct 4B lane 1,2 closure
PlannedOther
- Thu 17 Sept, 22:00Fri 18 Sept, 05:30
- Fri 18 Sept, 23:00Sat 19 Sept, 06:00
Source: National Highways
M4 Eastbound Jct 4B exit slip road closure
PlannedCarriageway closures
- Thu 17 Sept, 22:00Fri 18 Sept, 05:30
- Fri 18 Sept, 23:00Sat 19 Sept, 06:00
Source: National Highways
M25 Clockwise Jct 15 to Jct 16 Lane 1
PlannedOther
- Sat 19 Sept, 22:00Sun 20 Sept, 05:30
Source: National Highways
M4 Eastbound Jct 4B exit slip road lane 1 closure
PlannedOther
- Sat 19 Sept, 22:00Sun 20 Sept, 05:30
Source: National Highways
M4 Eastbound Jct 5 to Jct 4b Lane 1
PlannedOther
- Sat 19 Sept, 22:00Sun 20 Sept, 05:30
Source: National Highways
M4 Eastbound and Westbound Jct 4B to M25 Clockwise Jct 15 link road closure
PlannedCarriageway closures
- Sat 19 Sept, 22:00Sun 20 Sept, 05:30
Source: National Highways
M4 Westbound Jct 4B exit slip road lane 2 closure
PlannedOther
- Sat 19 Sept, 22:00Sun 20 Sept, 05:30
Source: National Highways
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
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
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?
There are closures in place at Thorney Interchange right now. See the current incidents below for which carriageway, slip road or link road is affected. 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.