Ground works are to take place at Longman roundabout in Inverness, as part of a traffic bottleneck upgrade project.
Causeway Geotech has secured a contract for investigation works, which are due to commence in early September and take four weeks to complete.
Cabinet Secretary for Transport, Infrastructure and Connectivity Michael Matheson said: "This ground investigation contract will help inform the design work for this much-needed upgrade having let the public see and provide their views on five possible options for the junction in May.
"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."
(CM/LM)
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