A9 Kincraig to Dalraddy

RPS acted as lead designer for Transport Scotland on this DBO project. This scheme is part of the wider A9 Dualling Programme to improve the A9 between Perth and Inverness and is the first section of the overall programme to be dualled. The project comprised 7.5km dual carriageway, 7.5km non-motorised user route, and six large underpass structures.

Key details

Project name

  • A9 Kincraig to Dalraddy


  • Transport Scotland


  • Scotland

Services provided

  • Detailed design
  • Preliminary design
  • Building Information Modelling (BIM) Level 2
  • Structural engineering
  • Transport planning
  • Vehicle Restraint Systems (VRS)
  • Traffic Signage and Road Marking


The A9 project presented a number of challenges to our team. The proposed route ran through the Cairngorms National Park in the Highlands of Scotland and also crosses through Alvie Site of Special Scientific Interest and a tributary of the River Spey Special Area of Conservation. This presented significant challenges to our design and ecological teams.

Other project challenges included relocating the non-motorised user route off-line in order to reduce the width of the underpass structures and introducing sections of split-level carriageway to maximise the utilisation of site won fill material.

Kincraig-Dalraddy A9 upgrade - Project image.jpg


RPS delivered for Transport Scotland design elements, developed on a BIM platform to include:

  • 5km of D2AP carriageway with two lay-bys
  • 8km of WS2+1 carriageway reduced to S2 carriageway with one lay-by
  • 5km of non-motorised user route
  • Two major / minor left in / left out priority junctions
  • Six underpass structures, to accommodate private access tracks, watercourses and non-motorised user routes with one culvert structure
  • Vehicle restraint systems
  • Earthworks, including dealing with peat, rock engineering and other geotechnical measures
  • Drainage works, SUDS, new culverts and culvert extensions/upgrades
  • Traffic signing and road marking
  • Accommodation works, including access tracks
  • Undertakers works and Private Apparatus Works
  • Landscaping and environmental mitigation works

RPS also provided ecological monitoring services which involved monitoring environmental compliance of the scheme and developing good practice, working closely with on-site teams and external regulators.

Project statistics

£35 million
Kilometres of dual carriageway
Kilometres of non-motorised user route

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