Delays are expected on the A9 as work starts on two stretches ahead of the dualling programme for the busy route.
Traffic restrictions will be imposed for two weeks between Kincraig and Dalraddy – the first section of the Inverness-Perth road due to be dualled.
A second stretch between Birnam and the Tay Crossing in Perthshire will also start on October 1, and is due to take around 15 weeks.
Both stretches of work are for ground investigations to get information on the existing carriageway and the adjacent land.
Ten new boreholes will be drilled between Kincraig and Dalraddy, while 50 are needed for the challenging stretch between Birnam and the Tay Crossing.
Traffic management arrangements will include short contra-flow sections controlled by temporary traffic signals.
A Transport Scotland spokeswoman apologised for any inconvenience caused by the works and thanked road users and local communities for their patience over the next four months.