M25, JUNCTION 16-17


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 alongside the M25 – the best location is on the site of Warren Farm where an on-line MSA can be provided within an extensive, well contained and attractively landscaped area

Further Information

A significant public safety risk exists on the Western M25

The Public Safety Role of MSAs

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

Future Emissions Reduction Measures

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

Extra's Approach

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

A Significant Public Safety Need

Finding a suitable location.
Extra has undertaken an extensive search of potential

M25, Junction 16-17

Significant social and environmental benefits for the local area

Working with the Local Community

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

Where is the Safety Risk on the M25?

Spatial sketch of Extra's land interest and the potential footprint of an MSA

M25 West (Warren Farm)

Motorway Service Area

£1.5 million in annual rates; 340 permanent jobs

Economic Benefits