An investigation was today under way after a lorry working on the Aberdeen Western Peripheral Route tipped into a ditch.
The incident happened while the vehicle was working on the bypass construction site near Blackdog yesterday.
It is believed the vehicle toppled over due to a mechanical fault while it was lifting its load.
The incident comes just days after safety fears were raised when two construction vehicles tipped over in the space of 48 hours.
A Transport Scotland spokesman today said: “Aberdeen Roads Limited is aware of an incident which occurred on site. “We and our contractors regard safety as paramount.
“An investigation is under way and the contractor will ensure any lessons are learned and appropriate action taken.”
Councillor Paul Johnstone, who represents the Blackdog area, said: “It’s one of Scotland’s largest construction projects.
“It’s a major site and they’re up against it to do the work within the time.”
Cllr Johnstone added that while the incident was concerning, it was reassuring that it happened on a construction site with no risk to the public.
He said: “At least it’s confined to the site.
“What would concern me greatly is if these accidents were happening off the site on main roads.”
The incidents last month were completely separate from each other.
In one incident at Kirkhill, Dyce, a large rear-tipping dump truck, which would have weighed several tonnes, ended up on its side.
The incident was thought to have happened on the morning of Friday, June 23.
And the following day, a 35-year-old had to be taken to hospital when an excavator tipped over near Craibstone.
The multi-million pound project is due to open by the end of this year, and is expected to drastically reduce journey times around the city.