The biggest road project ever delivered in Western Australia's South West will be named after the area's Traditional Owners.

The Bunbury Outer Ring Road will be known as the Wilman Wadandi Highway upon opening, after consultation with local Aboriginal and Heritage advisory groups, the community and local government.

The joint state and federal project - 86 per cent complete and likely opening later this year - has been an economic powerhouse for the WA economy, injecting $588 million to almost 370 businesses.

Almost $50million of that has flowed to Indigenous suppliers, while more than 190 local First Nations people have received on-the-job training through the project's award-winning Yaka Dandjoo program, with 131 gaining full-time employment as a result.

The Wilman Wadandi Highway, a 27km, four-lane road connecting Forrest Highway north of Bunbury, to Bussell Highway south of Bunbury, will make the commute to and from the South West faster and safer for thousands of families by removing vehicles travelling from local Bunbury roads, with 18 minutes expected to be saved in travel time from Perth.

"The Wilman Wadandi Highway is the biggest transport infrastructure project ever planned and executed for the South West, which has created significant local economic and job opportunities," federal infrastructure, transport and regional development minister Catherine King said.

"Recognising and integrating a Noongar name for such an important route, honours the Wilman and Wadandi people and their connection to the land."

WA Transport Minister Rita Saffioti said the Wilman Wadandi Highway would alleviate congestion on local Bunbury roads by removing vehicles that previously used the local road network to reach nearby Busselton, Dunsborough and Margaret River towns.

"It's fitting the name of the road will recognise the Traditional Owners, given the incredible outcomes we have seen through the project's award winning Yaka Danjoo program," she said.

WA Lands Minister John Carey said the naming of the Wilman Wadandi Highway highlighted the importance of Aboriginal place naming in WA.

"We acknowledge and respect the long history and ongoing contribution of Aboriginal people in the region," he said.

"This naming adds to other approved Aboriginal place names in the state, including Bunuba National Park in the Kimberley region and Ngirntaka Point in our Goldfields-Esperance region."