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M9 Junction 1A Improvement

  • Contract Value: £31.2 Million
  • Contract Type: Design & Build (FIDIC Form)
  • Client: Transport Scotland
  • Start/End: July 2011 – February 2013
  • Company Involvement: Roadbridge Sisk JV was appointed as the Main Contractor for this project in July 2011. Jacobs Arup are the Engineers for the client. This project was completed six weeks ahead of schedule and opened to the public in February 2013.
  • Project Awards M9J1A achieved a score of 86.5% from CEEQUAL in 2013 and two Bronze Awards at the National Considerate Constructors Scheme Awards in 2013 and 2014.


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This project forms part of the overall Forth Replacement Crossing and involved the provision of new link roads between the M9 and the M9 Spur, including construction of over 800m of new link roads. The existing M9 was also widened over a length of approximately 1km, incorporating a new Westbound auxiliary and a new Eastbound lane. The ITS system included 17 overhead gantries, maintenance hard standings and carriageway traffic detectors.


Key Features

  • Construction of a new 3 span steel composite overbridge over the M9
  • Widening of the existing Overton Road and B9080 under bridges
  • Diversion of Swine Burn under link road
  • Significant traffic management on 3 lane motorway with 40,000 AADT
  • An Intelligent Transport System (ITS) with variable speed limits, including communications infrastructure, electrical work and variable message signs.