Raeburn Drilling and Geotechnical will be starting ground investigations for the section of the A9 Dualling programme which includes the section past Aviemore and the remote Slochd summit.
From Monday 19 November Raeburn will be undertaking the £5M contract expected to take 17 weeks.
This section of the A9 dualling includes the second highest point on the A9 at over 396m above sea level is part of the challenging 24km Dalraddy to Slochd stretch of the route.
A Transport Scotland spokesperson said: “The first dualling scheme between Kincraig and Dalraddy opened to traffic in September last year and following the appointment of the contractor for the Luncarty to Pass of Birnam project, preparatory works are already underway with on-site activity expected to increase from early 2019.
“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 the 24km section between Dalraddy and Slochd includes the section past Aviemore and the challenging Slochd summit – the second highest point on the A9.
“We apologise for any inconvenience these works will cause and would thank road users and local communities in advance for their patience during the works. The contractor will closely monitor the operation of the traffic management measures to ensure that delays are kept to a minimum.”
Raeburn was awarded the contract last month.