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M25, JUNCTION 16-17


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MSAs are not ‘footloose’, they can only be built alongside the Motorway that they serve. In this area the M25 runs through the London Green Belt. The means that the only way that the public safety and welfare need can be met is through development in the Green Belt.


Government Policy has a clear preference for ‘on-line’ MSAs ie not connected to the local road network or not located at a Junction. This is because they are more attractive to drivers on the Motorway and do not add traffic to the existing road network.


The number of potential on-line locations is constrained by the need to have a safety gap of typically 2km between the end of any slip road and the nearest next slip road.


Extra has undertaken an extensive search of potential alternative sites along the western side of the M25. Extra have previously proposed a MSA on the west side of the M25 between J16 and J17. Following a Public Inquiry, Extra have considered issues raised by the Planning Inspector & sought ways to address them. As a result of this, it is now proposed to locate the main MSA buildings on the east of the M25

Further Information

The Public Safety Role of MSAs

A significant public safety risk exists on the Western M25

Future Emissions Reduction Measures

Supporting the roll out of zero emissions vehicles - addressing the challenges of recharging anxiety' on the Motorway network

Extra & Their Approach

Considering any new site holistically, taking account of all aspects of development

A Significant Public Safety Need

A matter of urgency if fatigue related accidents are to be reduced

M25, Junction 16-17

Finding a suitable location.

Extra has undertaken an extensive search of potential

Working with the Local Community

Significant social and environmental benefits for the local area

Where is the Safety Risk on the M25?

A new MSA located between Junctions 16 and 17 would fill the largest number of safety gaps

Chiltern Chalfont Services

Extra has identified a site of under 40 hectares which focuses on the eastern side of the Motorway between Junctions 16 and 17

Economic Benefits

£1.8 million in annual rates; 310 permanent jobs

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