First work to start on A9 average camera system
Work to build the infrastructure needed for a system of average speed cameras on part of the A9 will begin on Monday.
The construction project could last for about four months.
Transport Scotland said some lane closures would be required during the work, but added that this should not cause significant delays.
The new system between Inverness and Perth is opposed by campaign group A9 Average Speed Cameras Are Not the Answer.
It has called for action to tackle bad overtaking.