Subject to completion of the mandatory standstill period, work is programmed to start in early October and is expected to last around 8 weeks subject to weather conditions.
Cabinet Secretary for Transport, Infrastructure and Connectivity, Michael Matheson said: "As part of the Scottish Government's commitment within the £315 million Inverness and Highland City-Region Deal, we are taking forward our plans to improve the traffic bottleneck at Longman in the Highland capital.
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"Having let the public see and comment on the preferred option for the scheme in June, we are continuing to push forward with the design of the preferred option in greater detail, with a view to publishing draft Orders next year.
"These ground investigations will provide the detailed information needed to help inform the ongoing development and assessment of the preferred option."
A Transport Scotland spokesperson said: "Some of this work will take place on or near the live carriageway and in order to ensure the safety of road workers and road users we will need to introduce traffic management arrangements. Road users and local communities will be kept informed of our plans and we will endeavour to ensure that any disruption is kept to a minimum."
(MH/JG)
