Fences designed to keep kangaroos off the Tuggeranong Parkway have been installed alongside the northern third of the road.
The specially designed animal-proof fencing now stretches beyond Cotter Road, one of the busiest overpasses along the route.
Works are continuing along the southern two-thirds of the road from Cotter Road to Sulwood Drive, funded through the federal government's Black Spot Program.
Due to earlier upgrades completed last year, the first part of construction was also the cheapest, costing just under $270,000.
The stretch between Cotter Road and Hindmarsh Drive will cost $748,000, while the final stage between Hindmarsh and Sulwood Drive will be the most expensive at $1.15 million.
The Tuggeranong Parkway, which passes several nature strips with high macropod populations, is listed by the ACT government as one of the hotspots for kangaroo-car collisions in the territory.
Hindmarsh Drive is listed as an exceptional hotspot for the collisions.
In addition to the animal-proof fencing, the upgrades include the installation of LED lighting, warning signs and traffic control devices to help mitigate risks from wild animals as well as other collisions.
When the project was first announced, federal Infrastructure Minister Darren Chester said it was designed to make the parkway safer for both motorists and animals.
"The improvements will restrict access for animals, such as kangaroos, to the parkway," he said. "The program is a crucial part of the Australian government's commitment to reduce crashes on our roads."
ACT Transport and Municipal Services Minister Meegan Fitzharris said the works would improve safety and reduce ongoing maintenance costs.
"The LED lights appear brighter, consume less energy and therefore cost less to run," she said. "They should also not require maintenance for 10 years, rather than the four years expected for the existing high pressure sodium street lights, further adding to savings."
The ongoing roadworks will not lead to closures, but could continue to result in reduced speed limits along the parkway.
Motorists who see an animal on the road are urged to brake, but not swerve, to avoid a collision.
A veterinarian or wildlife rescue centre should be called if the animal is still alive.