Update: M25 junction 15 anticlockwise closures (8pm to 10am)
Connect Plus Services works on behalf of National Highways and Connect Plus to manage, operate and maintain the M25 and its linking roads, including the Dartford-Thurrock River Crossing.
I’m writing to let you know that we have postponed this weekend’s planned closure at M25 junction 15 due to forecast adverse weather conditions.
As a result, the M25 junction 15 anticlockwise carriageway will no longer be closed between 8pm on Saturday 24 October and 10am Sunday 25 October 2026.
Instead, we’ll need to use a contingency closure to complete this work the following weekend.   The M25 junction 15 anticlockwise carriageway, above the M4, is now scheduled to close: From 8pm Saturday 31 October until 10am Sunday 1 November 2026
The M25 junction 15 clockwise carriageway and all links between the M25 and M4 will remain open throughout the works.
Diversion route   During the closure, M25 anticlockwise traffic will need to exit at junction 15.   There will be a fully signed diversion route in place to rejoin the M25 anticlockwise carriageway after the closure: follow the M4 westbound to junction 5   turn around at M4 junction 5 (the Langley Interchange) return on the M4 eastbound to rejoin the M25 anticlockwise via M4 junction 4b

The route will be busier than usual, with residual delays expected on the M25 on Sunday after the closures have been removed.

If you must travel between these times Please plan ahead and allow extra time for your journey.   Travel earlier or later in the day – we’re expecting the busiest time around the M25/M4 interchange on Sunday mornings between 8am and midday.
Where possible   Consider alternatives to avoid severe delays, including alternative routes or public transport (i.e., for Heathrow Airport, Heathrow Express, Elizabeth Line).   We’ll complete some further works on weekday nights. These closures will take place between 10pm and 6am. During weekday nights, a diversion will be in place to M4 junction 4 and return.   M25 junction 15 anticlockwise weeknight closures diversion route map   You can find information about this work and updates on the scheme webpage.
https://nationalhighways.co.uk/roads-and-travel/road-projects/south-east/m25-junction-15-m4-junction-4b-bridge-repairs-near-heathrow-airport/

Please remember that closures can change at short notice. For the latest roadworks information, please visit www.nationalhighways.co.uk/travel-updates.   We sincerely apologise for any inconvenience and thank you for your patience and cooperation while we complete this essential work.   If you require any further information, please don’t hesitate to contact us:   By phone: 0300 123 5000 By email: info@nationalhighways.co.uk www.nationalhighways.co.uk   Kind regards   Ben Evans Scheme Communications Manager