Ground investigation work is to take place between Tay Crossing and Ballinluig as part of the A9 Dualling programme.
In addition, further investigations will be carried out on the northern section between Tomatin and Moy.
Both sets of works will last around eight weeks and are scheduled to get underway on Monday, 05 February.
To carry out the work safely, traffic management will be in place including alternate single file traffic sections controlled by temporary traffic signals.
A spokesperson for Transport Scotland said: "This further ground investigation work is needed to get important information on the existing ground conditions in the vicinity of the A9 carriageway for two stretches of the route to be dualled between Tay Crossing and Ballinluig and further north between Tomatin and Moy.
"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."
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