M25 overnight closures affect 14 junctions from 17 August
National Highways advises drivers to plan ahead for five nights of roadworks on London’s orbital motorway.
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Drivers on the M25 will face overnight closures at 14 junctions for five consecutive nights starting Monday 17 August. National Highways confirmed the works will begin at 10 pm each evening and end at 5.30 am the following morning, affecting both clockwise and anti-clockwise carriageways, slip roads and link roads.
Which junctions are closed and when
M25 overnight closures this weekend force diversions at 11 junctions
National Highways advises drivers to check routes before travelling between 14 and 17 August
On Monday night, the clockwise carriageway between junctions 15 and 16 will close, including the M4 eastbound and westbound link roads to the M25 anti-clockwise. The same stretch will close again on Tuesday, Wednesday and Thursday nights. This section serves Heathrow Airport and the M4 corridor.
In Barnet, the anti-clockwise carriageway between junctions 13 and 11 will close every night from Monday to Thursday. Junction 13 connects to the M1 and A1(M), while junction 11 links to the A10 and A406 North Circular. Residents travelling to or from Enfield, Hertfordshire or central London will need to use alternative routes.
Other recurring closures include the clockwise carriageway between junctions 25 and 27 in Enfield, and the anti-clockwise carriageway between junctions 25 and 24. Junction 25 connects to the A10, a key route for commuters between Enfield and central London. Slip roads at junctions 25 and 26 will also close on multiple nights.
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The full list of closures for each night was published by National Highways and reported by This Is Local London. No closures are planned for Friday night into Saturday morning, marking the end of the scheduled works.
Advice for drivers
National Highways urged drivers to allow extra time for overnight journeys and to check their routes before setting off. Diversions will be in place while the closures are active, but no specific diversion routes have been published. Drivers can use real-time traffic apps or the National Highways website for updates.
The closures are part of routine maintenance on the M25, though National Highways has not specified the exact nature of the works. No further overnight closures are scheduled beyond 21 August, but additional works may be announced later in the year.
What happens next
The final night of closures will end at 5.30 am on Friday 21 August. National Highways has not indicated whether similar overnight works will take place in the coming weeks. Drivers can sign up for email alerts on the National Highways website or follow @HighwaysSEAST on X for updates.
Questions this report answers
+Which M25 junctions in Barnet will close overnight?
The anti-clockwise carriageway between junctions 13 and 11 will close each night from 10 pm to 5.30 am, 17 to 20 August. Junction 13 links to the M1 and A1(M), while junction 11 connects to the A10 and North Circular. Diversions will be in place.
+How long will the M25 closures last each night?
Each closure will start at 10 pm and finish at 5.30 am the following morning. The works are scheduled for five consecutive nights, from Monday 17 August to Friday 21 August. No closures are planned after 5.30 am on 21 August.
+What should drivers do if their route is affected?
National Highways advises drivers to check their routes before travelling and allow extra time for journeys. Diversions will be in place, but no specific routes have been published. Real-time updates are available on the National Highways website or traffic apps.
+Will there be more M25 closures after 21 August?
No further overnight closures are scheduled after 5.30 am on 21 August. National Highways may announce additional works later in the year, but no details have been provided. Drivers can sign up for email alerts for future updates.
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