Visitors to the popular Enchanted Forest are being warned of traffic delays en route to the site due to A9 dual carriageway works.
Tens of thousands of people are expected for the spectacular event in Pitlochry which runs from October 4 to November 4 this year.
However, Transport Scotland has announced it is to carry out ground investigations for the dualling of the A9 from Monday (October 1) in the Ballunluig area with temporary traffic lights to be put in place, controlling alternate single file traffic sections.
The work is set to last 10 weeks and could cause issues for tourists.
Transport Scotland apologised in advance of any delays and said it aims to keep delays to a minimum.
A Transport Scotland spokesman said: “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.
“As part of the ongoing design work we need to carry out further ground investigations to get important information on the existing ground conditions in the on the sections to be dualled.
“The first of these vital investigations starting next Monday are for the section between Tay Crossing and Ballinluig and in the coming weeks and months we will be announcing details of further ground works across the dualling programme.
“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.
“While we do not expect major disruption to traffic, we would ask drivers to plan their journeys in advance using the Traffic Scotland website, twitter feed or Traffic Scotland radio.”
Last year 73,000 people attended the sold-out Oir an Uisage show at the forest with similar numbers expected this time round.
This year’s theme will, Of The Wild, has been firmly rooted in nature. The theme is largely inspired by the mysteries of Faskally Wood – the show’s traditional home – after dark.
The creative team promises an engaging night-time walk, combining spectacular visuals, innovative technology, interactive special effects and an original music score.