Transport Secretary Michael Matheson has been urged to ensure the cost of the £49.5 million Haudagain roundabout project does not spiral further.
North East Tory MSP Liam Kerr pointed out the budget had increased by £35m when he challenged Mr Matheson at Holyrood on Wednesday.
Mr Kerr pointed out the project costs were originally estimated at £14m and asked the Transport Secretary to “say here and now that it will not rise again?”
Mr Matheson said the cost included land purchase, utility diversions, advisory fees, preliminary work, geotechnical work and environmental surveys and accused the Tories of “talking down” Scotland.
Earlier Mr Matheson was challenged over a £65m payment made to the Aberdeen bypass contractor to settle a legal dispute. North East Lib Dem MSP Mike Rumbles accused the Transport Secretary of failing to inform parliament. But Mr Matheson argued Holyrood was told through the Rural Economy committee.