The company building the Aberdeen bypass will be responsible for maintaining it for 30 years.
Aberdeen Roads Limited (ARL) is in the process of constructing the route, which is expected to be completed next year.
Once the Aberdeen Western Peripheral Route (AWPR) is in operation the maintenance of it will be down to ARL.
A Transport Scotland spokesman said: “The contract is to design, build, finance and operate it.
“ARL is not only responsible for the construction, but will operate and maintain it for the next 30 years after completion.
“They will have their own depot and run their own gritters.”
After the 30 years are up, Transport Scotland will take over the maintenance.
The spokesman added: “ARL is obligated to hand over the road in a good condition.”
The road, set to be completed by winter 2017, will stretch from the A90 at Stonehaven and Charleston in the south to Blackdog in the north.