Two massive 131-tonne transformers will be transported from Dundee to Highland Perthshire at 10mph at the weekend as part of the Beauly to Denny power line project.
The electrical transformers, built in Portugal, were shipped to the port in Dundee and due to their size they will be taken on 12-axle trailers that can move around obstacles.
Police will accompany the transformers for the entire length of their journey, travelling in convoy.
Scottish Hydro Electric Transmission has finalised plans to arrange delivery of two further 131-tonne electrical transformers, as part of the Beauly to Denny network reinforcement project, this time delivering the components between the docks at Dundee and a new substation at Tummel Bridge.
It will take two days to move the giant electrical transformers, with them leaving Dundee at around 8am and being taken up the A9 to Ballinluig on Saturday, and then on Sunday from there to Tummel Bridge.
Similar transformers have already been delivered and installed in Beauly and Fort Augustus.
Police Scotland are warning drivers that delays will be inevitable.
A spokesman said: “Police Scotland is advising members of the public of a number of abnormal loads containing electrical transformers that are to be moved from Dundee Harbour to Tummel Bridge, Perthshire.
“The abnormal loads will moved from Dundee Harbour on to A92 A991- A85 A90 A9 at Ballinluig on Saturday.
“On Sunday, the transformers will be transported from Ballinluig on to A827 on to unclassified road Strathtay B846 to Tummel Bridge.
“The loads will be extremely slow moving and Police Scotland will try and minimise disruption to other road users as much as possible.
“Police Scotland would like to thank the public in advance for their patience during the movement of these abnormal loads.”