The road, which has been touted for the Queanbeyan-Jerrabomberra area for more than 10 years, would connect the rapidly growing suburbs with the ACT.

Labor has made promises to build the road before, including at the 2019 NSW state election. For the road to be built, the funding would need to be matched by the NSW government, the party says.

Queanbeyan-Palerang Council signed off on a preferred route in 2015, but a study estimated the road would cost $200 million to build, not including the purchase of land needed.

Upgrades on Old Cooma Road, also intended to support traffic in the area, are edging closer to completion.

Hoping to retain the seat after the retirement of popular local member Mike Kelly due to health reasons, the party's leader Anthony Albanese said infrastructure would be a major factor in the campaign.

"Growing regional communities like those in Googong and Jerrabomberra desperately need better infrastructure to ease traffic congestion and boost local jobs," he said.

The party's candidate, former Bega mayor Kristy McBain, said it was one of the major issues locals were bringing up with her.

"I've been listening to the people in and around Queanbeyan and they are making it clear the Dunns Creek Road project will make a real difference to commuting times," she said.

The byelection is set down for July 4, and by the end of the week the last of the major parties will have confirmed its candidate. After expletive-laden text messages between Nationals NSW leader John Barilaro and federal leader Michael McCormack were leaked over Mr Barilaro's aborted candidacy, local branches have decided to run a preselection process. Nominations will close on Tuesday afternoon, with a candidate to be chosen by Saturday.

Former candidate Sophie Wade won't run, but Ms Wade said multiple members wanted to put their hands up to ensure regional voices were heard in the byelection.

Voters across the large marginal electorate will face a long ballot paper, with 10 candidates already declaring their intention to run, before the close of nominations on June 9. The Greens announced Bega Valley councillor Cathy Griff as their candidate on the weekend.

Matthew Stadtmiller will run for the Shooters, Fishers and Farmers Party, potentially creating headaches for the Nationals and Liberals through preference deals, although the party said it was yet to make preference decisions.

On Monday Mr Stadtmiller said he was running for the "forgotten people" and that the minor party had showed it could keep parties accountable in NSW state parliament.