The A9 Dualling Programme will see approximately 80 miles of upgraded road being delivered between Perth and Inverness by 2025.
Work has already begun on the five-mile £35m section between Kincraig and Dalraddy and is being carried out by a joint venture of Wills Bros Civil Engineering and John Paul Construction.
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Traffic management and a 40mph speed limit are to be rolled out on the A9 as work gets underway.
The restrictions will come into force from Monday, 21 September.
A Transport Scotland spokesperson said: "As part of the A9 Dualling works traffic management and a 40 mph speed limit is required to ensure that the works are carried out safety for the benefit of road users and the workforce."
(LM/MH)
