Soil Engineering will start ground investigation on two adjoining sections of the A9 next week.
In the last of the latest series of ground investigation for the A9 Dualling programme, Soil Engineering will undertake the £2.6M contract for the Pitlochry to Killiecrankie and Killiecrankie to Glen Garry schemes totalling over 27km.
The work is expected to last around three months.
Incorporating a wide range of investigation techniques, including works on slopes and the use of sonic drilling, the investigations will be undertaken in a variety of settings, including verge works on the A9 itself, which will be coordinated with the road operator Bear Scotland.
A Transport Scotland spokesperson said: “The first dualling scheme between Kincraig and Dalraddy has now been operating for some time and construction of the Luncarty to Pass of Birnam section is due to begin in the coming weeks.
“At the same time, design work on the A9 dualling programme continues at pace with eight of the nine remaining dualling schemes being designed now at draft Order stage.
“The latest ground investigations starting next Monday for two schemes totalling over 27km along with other GI continuing on other sections is tangible evidence of the work going on to deliver this ambitious programme.
Soil Engineering was awarded the contract in December and has already completed three major Transport Scotland ground investigations this year - A9 Tay Crossing to Ballinluig, A720 Sherrifhall Junction, and A82 Tarbert to Inverarnan.