Balfour Beatty has been chosen for the latest section of a £3bn dualling programme linking central and north-eastern Scotland.
Transport Scotland is set to appoint the contractor to widen a 9.5 km stretch on the A9 between Luncarty and Pass of Birnam, which is expected to cost £96m.
Balfour Beatty was chosen ahead of three other shortlisted bidders: Dragados SA, Wills Bros Civil Engineering and a joint venture between Farrans Construction and Roadbridge.
The procurement is now in a standstill period and will be officially awarded in the next two weeks.
Balfour Beatty will also construct four overbridges, widen one existing underbridge and deliver a new side road bridge, as well as providing cyclical maintenance for the road once completed.
The overall £3bn A9 dualling programme will see 129 km of road from Perth to Inverness converted from single to dual carriageway.
Work will be split into 11 construction packages, with the Luncarty to Pass of Birnam one of the earliest contracts to be let.
The first section of the programme was the £35m Kincraig-to-Dalraddy project, which was delivered by Wills Bros Civil Engineering and John Paul Construction JV and completed in September 2017.
The Scottish Government has pledged to complete the full £3bn programme by 2025.
Transport secretary Michael Matheson: “This marks another significant milestone in the timeline of this major transport infrastructure project for Scotland to upgrade 80 miles of single carriageway between Perth and Inverness.
“The dualling of the A9 will create hundreds of new jobs throughout the construction phases which will leave a lasting legacy of a highly skilled workforce, bolstering Scotland’s construction industry.”