Working closely with the scheme designers and the contractor, we checked over 1200 separate design packages to facilitate the signing of over 900 design check certificates in a timely manner.
Ed Warren

Edward Warren

Technical Director
Ferrovial Lagan JV


Roughan & O’Donovan acted as independent design checker on this ambitious project to upgrade the core of Scotland’s motorway network between Glasgow and Edinburgh.


We were responsible for the detailed check of all disciplines from the stabilisation of historic mine workings through to intelligent transport systems (ITS).

Key elements included:

  • 16km of improvements to the existing motorway network
  • 12km of new build motorway
  • Upgrades to 12 existing motorway junctions
  • New build or modifications of 5 bridges over operational railways
  • The 2,000 tonne Braehead Railway Bridge
  • Several 3 and 4 span steel composite bridges
  • 70m clear span crossing of the environmentally designated North Calder Water
  • Extensive mineworkings, subsurface voids and remediation measures
  • Extensive earthworks including steepened earthworks, soft ground, made ground and contaminated land
  • Pavement design and assessment
  • ITS including lane, speed and variable message signals, vehicle detection, CCTV, journey time and weigh-in-motion monitoring
  • 5km of new pedestrian and cycle routes
  • Working with Roughan & O'Donovan has been a pleasure.

    Fernando Gutierrez

    Design Manager, Ferrovial-Lagan JV


The presence of significant areas of mineworkings throughout the scheme presented a challenge to our geotechnical team. Together with our mineworkings specialist, Mason Evans, we developed independent geologic interpretations and assessments of shallow mining and instability to identify areas and depths of remediation. This included extensive probe holes and grout remediation.


Sliding Braehead Railway Bridge, a 2,000 tonne rail over road bridge, into place under an operational railway represented a significant project highlight. 



Read about our latest work on the A6 in Northern Ireland