Appin residents are being urged to provide feedback on the state government's proposed options for stage two of the Outer Sydney Orbital project.
The public consultation process for the proposed route was opened on Monday with two potential options provided for the second stage of the orbital.
The 'blue option' extends from the proposed orbital stage one corridor at the Hume Motorway, crossing the Nepean River, before curving south at West Appin and connecting with Appin Road.
The 'yellow option' also extends from the stage one corridor at the Hume Motorway, crosses the Nepean River, then follows Macquariedale Road and connects to Appin Road.
Both options avoid the Appin township, however Transport for NSW would not confirm how many properties may be affected by either option.
"Both corridor options bypass the Appin township to connect to Appin Road, south of the village," a Transport for NSW spokeswoman said.
"As part of the consultation process, we are engaging with landowners on the proposed route options to help identify a suitable option that minimises impacts to landowners wherever possible."
The Transport for NSW documents state that these options were short-listed based on existing land uses, conservation, heritage, the existing landscape and geography, potential noise and vibration, transport planning needs and socio-economic impacts.
The Transport for NSW spokeswoman said the region's koala colonies and the endangered Cumberland Plain Woodland were also considered during the planning process.
"Transport for NSW has been working closely with the Department of Planning, Industry and Environment to ensure the corridor options avoid koala habitats and colonies," she said.
"In future, and before the OSO2 is built in the longer term, more detailed design work will be carried out to ensure the inclusion of mitigation measures for koala habitats and crossings.
"We have been working closely with the Department of Planning, Industry and Environment to also minimise impacts on the Cumberland Plain Woodland.
"The corridor options impact some of this area, but this will be further refined as part of the consultation process."
Wollondilly mayor Robert Khan encouraged locals to take a look at the plan and have their say.
"Wollondilly Council is supportive of infrastructure investment to improve transport connections for our residents and will thoroughly consider Transport for NSW's proposal for stage two of the Outer Sydney Orbital, particularly its impact on Koala populations and our local community," he said.
"This is a key piece of infrastructure linking two of Australia's largest regions (Illawarra and Sydney metro) and will serve as a critical link to Sydney's second airport to the south west, however it's critical that it's done right."
Wollondilly MP Nathaniel Smith said the government wanted to hear from the community about the best route.
"We know the greater Macarthur area is growing, so it is essential the NSW Government plans ahead to ensure the community has the good transport connections it will need in future to support housing and conveniently connect people with jobs, services and the other places they want to go," he said.
"This is an opportunity for our community to help shape transport links of the future, by providing feedback about which option is preferred.
"This feedback, along with ongoing technical investigations, will inform Transport for NSW's planning."
The Transport for NSW spokeswoman confirmed it would hold consultation meetings with the community in future.
"As a result of the Coronavirus pandemic, consultation is being carried out via online sessions, and the community is being notified of these sessions via social media, print media, and the project webpage," she said.
"Information packs are also being provided to local landowners with the opportunity to speak with members of the project team.
"Transport for NSW encourages the community to participate in the consultation to provide their local knowledge so the most suitable option is identified."
Community consultation will close on Monday, December 14.