A key section of the Aberdeen bypass will open at the end of this week.
The new Charleston flyover will be open to traffic from Friday, with the current bridge soon to be demolished.
The eastbound carriageway of the bridge is expected to be accessible to motorists from about 8pm, when roads officials will permanently close the existing structure.
At the same time the current temporary northbound diversion will close and traffic will be re-routed over the new bridge.
A Transport Scotland spokesman said: “This is a key milestone in the AWPR/B-T project in this area. Northbound traffic leaving the A90 for the A956 will be able to use the new Charleston Junction Bridge for the first time from this weekend. Road users are beginning to see the project taking its final shape at this location and this will be underlined when the existing Charleston Bridge is demolished in the coming weeks.”
The merger between the A90 Aberdeen to Dundee road and Wellington Road is due to close for about six weeks to allow the demolition work to be carried out.
During this closure, drivers coming west on Wellington Road who want to travel north on the A90 will be diverted via the southbound route to Findon junction where they can rejoin and travel in the opposite direction.
Meanwhile, the southbound diversion will close over the weekend to allow its permanent replacement to be finished.
Southbound traffic wishing to go east on Wellington Road follow the A90 diversions to the Findon Junction, go northbound and come off at the new bridge.
The A90 will also be temporarily closed where it goes underneath the old flyover, details of this will be released in the coming weeks.
The spokesman added: “More information on this demolition, which will require the temporary closure of the A90, will be made available once the details are finalised.
“The new road layout will bring drivers into close proximity with road workers, so we would also like to encourage road users to apply more caution than usual when driving through or nearby this section of the A90 and the A956. Road users should also observe all road signage to enhance their safety, as well as the safety of others.
“We would like to thank road users for their continued patience and support during the construction of this major infrastructure project.”