The organisation has now published Road Orders for the stretch of the route between Luncarty and Pass of Birnam.
Work is scheduled to start towards the end of 2017.
Cabinet Secretary for the Economy, Jobs and Fair Work Keith Brown said: "The publication today of Road Orders for the next section to be dualled between Luncarty and the Pass of Birnam is a clear signal of that commitment and we expect to start the procurement process for the main construction contract for this project next year with work starting on the ground towards the end of 2017.
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"Next summer will see the first section to be dualled between Kincraig and Dalraddy open to traffic and with design work ongoing across the programme, we have now identified preferred routes for over 36 miles of the 80 miles to be dualled – meaning that nearly half of the route to be dualled is at preferred route status."
The A9 Dualling programme is on schedule for completion in 2025.
(LM)
