M25 Junctions 23-27: Smart Motorway

Project status:   Current


Start date:   February 2013
End date:  October-December 2014


Type:   Major Scheme
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Major Scheme

Part of our programme of improvements (value >10m)

Cost:  £188 million *


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Update - April 2014

The construction work between junctions 23 and 25 is now complete.

Work to remove the existing traffic management which has been inplace during construction is taking place over a number of nights and will be completed by the morning of Monday 14 April, when the temporary 50mps speed limit will be lifted and the new section of motorway will be fully open.

We have installed traffic management in the next phase, between junctions 25 and 27.  As part of the improvement works, we need to close sections of the motorway with various carriageway closures between junctions 25 and 27.  The closures are required in order to remove gantries spanning the carriageway and will take place between March, April and May.  Please see the Journey Impact tab for full details.

Drivers will benefit from the full completion of the scheme later this year.

Planned overnight carriageway closures

Gantry demolition 14 April to 16 April 2014

 Please note that work has now commenced on the M25 Smart Motorways Scheme between junctions 25-27.

As part of the works, we need to close sections over the motorway between junctions 25 and 27 on 3 separate occasions.  The closures are required in order to remove gantries spanning the carriageway. 

Monday 14 April - Wednesday 16 April 2014 inclusive

The clockwise carriageway will be closed between junctions 25 and 27. The diversion route will be along the A10, A406 and M11 and will be clearly signed.

Carriageway closures are required for this work for safety reasons.  Closures will take place between 10pm and 5:30am.

The opposite carriageway to the closure will remain open, with all of the machinery and equipment on the closed carriageway.

Please see the Journey Impact page for more details.

Publicity Campaign

The Project Team is conducting a publicity campaign to:

  • advise motorway traffic of the carriageway closures in advance
  • inform the local community of the closures and the diversion

We recognise that the closures affect both the travelling public and the local community and are therefore taking all possible steps to minimise disruption and inconvenience to all parties.

Should you have any questions regarding these plans, please contact our Contractor's Community Relations team on 01727 744933 or communityrelationsj2​3​-​2​7​.​m2​5​@​sbbjv.​co.​uk.

The M25 Managed Motorway Scheme  between junctions 23 and 27 is being carried out by Skanska Balfour Beatty Joint Venture for Connect Plus working on behalf of the Highways Agency.

All lane running

As part of our smart motorway initiative, the new road layout for this section of the M25 will involve “all lane running”. This means the hard shoulder is permanently converted into a traffic lane on these sections of the motorway.

Instead of the hard shoulder you will see regularly spaced emergency refuge areas, each one with an emergency telephone. We have also installed CCTV cameras to help us spot incidents and deal with them as fast as possible. Put your hazard lights on to help us.

If you can’t make it to an emergency refuge, the smart motorway technology lets us close any lane by displaying a red “X” on the gantries, moving traffic away from the incident and keeping it clear for emergency vehicles. Do not drive in a lane with a red “X” displayed over it.

All lane running increases the capacity of the motorway to reduce congestion and make your journey more reliable. It does this at a lower cost and with less disruption than a traditional road widening scheme.

Progress so far

So far we have:

  • repaired the existing drainage
  • widened the carriaegway in to the centre
  • installed a new, stronger concrete barrier
  • strengthened a number of bridges
  • repaired bridge decks
  • installed new lighting through junctions
  • installed portal and cantilever gantries
  • installed new technology systems with speed enforcement and driver information signs
  • installed new CCTV cameras and emergency telephones
  • installed permanent traffic management signs
  • constructed emergency laybys
  • resurfaced parts of the carriageway

What is happening?

We have developed proposals to provide smart motorway (previously known as managed motorways) on the M25 between junctions 23 and 27. Smart motorways help relieve congestion by using technology to vary speed limits. They also allow the hard shoulder to be used as a running lane to create additional capacity. They deliver these benefits at a significantly lower cost than conventional motorway widening and with less impact on the environment during construction.

Find out more about smart motorways.

When and where is this happening?

The scheme improvements will be made between junction 23 [A1(M) South Mimms] and junction 27 [M11(J5)] of the M25.

Construction work on this scheme commenced in February 2013.

Why is this happening and what will it cost?

The M25 is one of Europe's busiest motorways, handling around 200,000 vehicles every day. It is at the core of our network and is suffering from increasing congestion levels and journey times. We need to manage traffic flows better and to help achieve this we have already widened the carriageways from junctions 16 to 23, and from junctions 27 to 30, from 3 to 4 lanes in each direction.

The Secretary of State decided that this section of motorway could be improved by the introduction of a system to replace the hard shoulder with a fourth running lane (otherwise known as Smart Motorways - All Lanes Running).

Our aim is to provide the minimum amount of improvements necessary to deliver the safe operation of smart motorways.

Widening of the M25 is one of the recommendations of the Orbit Multi Modal Study which reported in November 2002. The study was tasked with addressing the problems of the M25 motorway and the orbital transport corridor around London. The study involved widespread public consultation and looked at the current problems and potential solutions to them. The report recommended that most of the dual 3 lane sections of the M25 should generally be widened to dual 4 lanes. The other sections to be widened were:

M25 Jct 16 to 23 (M40 - A1 (M)) - 21.8 miles (35 kilometres) - CompletedM25 Jct 27 to 30 (M11 - Dartford) - 14.3 miles (23 kilometres) - CompletedM25 Jct 5 to 7 (Sevenoaks to Redhill) - 12.2 miles (16 kilometres)M25 Jct 1b to 3 (Dartford - M20) - 3.1 miles (5 kilometres) - Completed

* The estimated outturn cost of £195 million was approved by the Secretary of State in November 2012 prior to the start of construction. The current forecasted cost for this scheme is £188 million as at the end of May 2013.

How will the scheme be carried out?

A number of cameras, information signs and signals on gantries will be installed as part of the improvement scheme. As the scheme design progresses we will provide more information on the location of these features. Using our knowledge of operating the M42 and M6 managed motorway schemes we have developed the smart motorway concept. These developments include permanently converting the hard should to a running lane and developing the design so that schemes will have:

  • Fewer overhead gantries which span the whole motorway.
  • Fewer signals over each lane and more verge mounting signing.
  • Comprehensive CCTV cameras – although there will no longer be the need for the dedicated cameras and operating systems required for opening and closing the hard shoulder.

Signs and signals will still be used to inform drivers of conditions on the network and when variable speed limits are in place.

What are the benefits?

This project will relieve congestion and smooth the flow of the traffic, improving safety and journey times. These benefits will also support economic development in the region.

We already have evidence of the benefits that a smart motorway scheme can bring. The first smart motorway scheme opened to traffic on the M42 motorway in 2006. Recent analysis of the data gathered since opening has found that journey time reliability improved by 22 per cent and reduced emissions by up to 10 per cent due to traffic flowing more smoothly.

In addition, personal injury accidents have reduced by more than half (55.7%) since hard shoulder running was introduced. There was also an overall reduction in the severity of accidents with zero fatalities and fewer seriously injured.

How do I find out more information ?

More information will be posted on this project page as it becomes available. You can subscribe to be alerted when updates are made.

If you have any queries about this project you should contact the Highways Agency Information Line by emailing ha_​info@​highways.​gsi.​gov.​uk or calling 0300 123 5000.

Site office:

M25 Smart Motorway Improvement Works - Junctions 23 to 27
Sanska Balfour Beatty Joint Venture
London Colney, St Albans
Hertfordshire
AL2 1FF

Email: communityrelationsj2​3​-​2​7​.​m2​5​@​sbbjv.​co.​uk
Telephone: 01727 744933

 The office is opened between 0700 and 1900 Monday to Friday, and 0700 and 1300 on Saturday, closed on Sunday. 

Making Part 1 Claims

Once the notices are issued, Part 1 claims for the M25 Junctions 23 to 27 Smart Motorway Scheme will be processed by the National Part 1 Claims Team in Birmingham. Find out more about Part 1 claims.

Part 1 claims submitted in respect of the M25 Junctions 16 to 23 and Junctions 27 to 30 schemes are being managed by the Design Build Finance and Operate (DBFO) company Connect Plus. All requests for further information relating to Part I claims on these schemes should therefore be directed to Connect Plus who can be contacted at Connect Plus House, St Albans, South Mimms, Potters Bar EN6 3NP or by telephone on 02033 868500. The contact for Part I claims at Connect Plus is John Worsfold.

Details of scheduled roadworks are provided to help you plan your journey. Please note that works are weather- and resource- dependent and may need to be cancelled at short notice. This information is not updated in real time so please check Traffic England for current traffic conditions. Diversion timings are approximate and act as a guide only.

Will there be roadworks?

Yes, roadworks will be needed but three lanes of the M25 will be kept open in each direction at peak times during construction. We will close lanes at times of reduced traffic flow for essential night time works. These closures will be agreed in advance with local police and stake holders.

Road Works

DateDurationDetailsAllow an Extra
17 to 21 April 2014 inclusiveN/AThere are no planned closures.N/A
23 to 24 April inclusiveOvernight 10pm to 5:30amM25 clockwise carriageway between junctions 25 to 27 will be closed for gantry works. The diversion route is via the A10, A406 and M11. There will be no entry from junction 26 to the clockwise carriageway.Anticipated delay approximately 30 minutes.
22 April 2014Overnight 10pm to 5:30amM25 clockwise carriageway junctions 22 to 24 - 2 lanes closed.Anticipated delay approximately 10 minutes.
22 April 2014Overnight 10pm to 5:30amM25 anti-clockwise carriageway junctions 24 to 23 - 2 lanes closed.Anticipated delay approximately 10 minutes.
22 April 2014Overnight 10pm to 5:30amM25 anti-clockwise carriageaway junctions 26 to 25 - 2 lanes closed.Anticipated delay approximately 10 minutes.
22 April 2014Overnight 10pm to 5:30amM25 Junction 26 clockwise carriageway entry slip road closed - diversion via junction 25.Anticipated delay approximately 10 minutes.
23 April 2014Overnight 10pm to 5:30amM25 jucntion 25 to 24 anti-clockwise carriageway - 2 lanes closed.Anticipated delay approximately 10 minutes.
23 April 2014Overnight 10pm to 5:30amM25 junctions 26 to 25 anti-clockwise carriageway - 2 lanes closed.Anticipated delay approximately 10 minutes.
24 April 2014Overnight 10pm to 5:30amM25 junctions 26 to 25 anti-clockwise carriageway - 2 lanes closed.Anticipated delay approximately 10 minutes.
24 April 2014Overnight 10pm to 5:30amM25 junctions 22 to 24 clockwise carriageway - 2 lanes closed.Anticipated delay approximately 10 minutes.
25 April 2014Overnight 11pm to 6amM25 junctions 25 to 26 clockwise carriageway - 2 lanes closed.Anticipated delay approximately 10 minutes.
25 April 2014Overnight 11pm to 6amM25 junction 25 clockwise carriageway - entry slip road closed. Diversion via junction 24.Anticipated delay approximately 10 minutes.
25 April 2014Overnight 11pm to 6amM25 junction 22 to 24 clockwise carriageway - 2 lanes closed.Anticipated delay approximately 10 minutes.
26 April 2014Overnight 10pm to 6amM25 junctions 25 to 26 clockwise carriageway - 2 lanes closed.Anticipated delay approximately 10 minutes.
26 April 2014Overni;ght 10pm to 6amM25 junction 25 clockwise entry slip road closed. Diversion via junction 24.Anticipated delay approximately 10 minutes.
27 April 2014Overnight 10pm to 6amM25 junctions 22 to 23 clockwise carriageway - 2 lanes closed.Anticipated delay approximately 10 minutes.
27 April 2014Overnight 10pm to 6amM25 junctions 28 to 27 anti-clockwise carriageway - 2 lanes closed.Anticipated delay approximately 10 minutes.
ADVANCE NOTICE
29 April to 2 May 2014 inclusiveOvernight 10pm to 5:30amM25 anti-clockwise carriageway between junctions 27 to 25 will be closed for gantry works. The diversion route is via the M11, A406 and A10 - there will be no entry from junction 26 to the anti-clockwise carriageway.Anticipated delay approximately 30 minutes.

How will you manage traffic?

During construction CCTV cameras will be installed on the motorway to support the management of incidents. The CCTV team will promptly identify incidents and notify our vehicle recovery teams to assist stranded motorists. A free vehicle recovery service will be provided within the roadworks.

We will provide facilities for stranded motorists where they can make arrangements to continue their onward journeys.

Will there be diversions?

Clearly signed diversions will be in place when road closures are necessary.

ActivityDate
Public Information Exhibition12 & 13 October 2012
Public Consultation3 December 2012 to 21 January 2013
Start of worksFebruary 2013
Start of work on Central ReserveMid July 2013
CompletionBetween October & December 2014

Business Case

M25 Junctions 23 to 27 Managed Motorways - Business Case
Business Case - Information correct as at December 2010

Leaflet

M25 Junctions 23-27 Smart Motorway - Smart Motorways Leaflet
M25 Junctions 23-27 Smart Motorway - Get smart know your motorways
M25 Junctions 23-27 Managed Motorways - Closure Information Leaflet
M25 Junctions 23-27 Managed Motorways - Closure Information Leaflet - March 2013

Legal

Newsletter

M25 Junctions 23-27 Managed Motorways Newsletter No 2
Welcome to our second newsletter. Since our last update, work to convert junctions 23 – 27 to a managed motorway has seen significant progress and is on target.
M25 Junctions 23-27 Managed Motorways Newsletter No 1
Welcome to the first report on progress to convert the M25 to a managed motorway between junctions 23 – 27.

Other

M25 Junctions 23-27 Smart Motorways - Safety Project Control Framework Products
Safety Plan, Hazard Log Report and Safety Report for the M25 Junctions 23-27 Smart Motorways scheme.

Report

M25 Junctions 23 to 27 Managed Motorways - Summary of Consultation Responses
Summary of Consultation Responses Managed Motorways – All Lanes Running M25 J23 to J27
M25 Junctions 23-27 Managed Motorways - Environmental Assessment Report
For a copy of the Environmental Assessment Report for this scheme please email the team at:M25J23toJ27MM@highways.gsi.gov.uk