We are currently working up smart motorway design options that would meet the aims of this scheme.
The government announced that the preferred solution was for a smart motorway with “All Lane Running” at J15 to J16 and also at J10, J11 and J12. This means the existing hard shoulder would be converted into a traffic lane providing five lanes for traffic at J15-J16 and four lanes elsewhere. Regular refuge areas are available in place of the hard shoulder for emergency use.
As part of this we will assess a wide range of information about the road to establish the nature of the current problems. This will help us develop an outline design concept and determine the Smart Motorway operating system best suited to this section of road. We aim to complete this first design stage by the end of May 2017.
We will also liaise with local authorities and technical stakeholders so we can take into account their views.
The next phase of design will begin in summer 2017.
|Government announces scheme||December 2014|
Why we need this scheme
The M25 J10-J16 has the highest traffic flows on the strategic road network with junctions 15 to 16 being a particular problem area being situated between two major motorways (the M40 and M4). Junctions 10 to 16 runs through areas of the Metropolitan Green Belt and several urban and suburban settlements. Junction 14 connects the M25 directly to London Heathrow Airport.
The two way vehicle flows on the section exceed 200,000 vehicles per day which results in frequent congestion and severe delay to road users.
A separate scheme is proposed for the interchange at junction 10.
A separate strategic study is looking at longer term options to improve the performance of the transport network between junctions 10 and 16 of the M25.
This scheme aims to:
- reduce congestion and delays
- improve journey time reliability
- maintain a high standard of safety
- support economic growth and job creation
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