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A737 Dalry Bypass

  • Project Type Roads / Bridges
  • Client Transport Scotland
  • Company Involvement Roadbridge and Farrans formed a joint venture to complete the Design, Construction and Maintenance of the Dalry Bypass, the project was constructed on behalf of Transport Scotland.
  • Form of Contract Transport Scotland Bespoke Contract
  • Dates June 2017 - December 2019
  • Location Dalry, North Ayrshire, Scotland


The A737 Dalry Bypass route is approx 3.8km in length. It starts to the north-east of Highfield, approximately 1.5km north-east of Dalry and runs in a south-westerly direction crossing the B707, Blair Road, the Glasgow to Ayr railway line and the River Garnock re-joining the existing A737 approx 600m south of Dalry.


Key Features

  • 420,000m³ of Excavation
  • 366,000m³ of Fill to road and environmental bund embankments
  • 75,000m3 of peat replacement
  • Construction of a 250m Steel Viaduct spanning the River Garnock and Ayr/Glasgow Railway
  • Construction of 1 no. Overbridge at Blair Road
  • Construction of 1 no. Cattle Underpass
  • Installation of 7 no. Box culverts ranging in sizes
  • 42,000m of drilling and 12,000 tonnes of grout used to fill the mining cavities beneath the road alignment at Highfield
  • Online construction of new Roundabout and 500m of approach road at western end of the bypass
  • Encapsulation of an existing Scottish Gas Networks HP main