Appin residents only have two more days to have their say on the state government's proposed options for stage two of the Outer Sydney Orbital project.
The major roadway will form a link between the Hume Highway and the Illawarra region stretching through Appin towards Menangle and Douglas Park.
The community consultation period was originally supposed to end on December 14, however it was extended until Friday, January 29.
Many Appin locals are concerned one of the options would not only destroy their homes but have a negative impact on the Appin township as a whole.
Life-long Appin resident Linda Seeney said while some people were against both options, the 'yellow option' posed the biggest risk to people's health and safety.
"Most of us know that we need another road in Appin because Appin Road is like a car park on weekends," she said.
"There are a lot of residents against the yellow option because it would destroy so many people's homes.
"It comes so close to the Appin township itself and would also destroy a heritage listed building which has been around since the 1800s."
The 'yellow option' for the proposed road extends from the stage one corridor at the Hume Motorway, crosses the Nepean River, then follows Macquariedale Road and connects to Appin Road.
Ms Seeney and her fellow residents have formed the Appin Orbital Motorway Support Group to advocate against the 'yellow option'.
"The yellow option is going to affect everyone in Appin," Ms Seeney said.
"It comes so close to the town, the preschool and the primary school.
"The emissions, pollution, vibrations and noise would affect the entire town."
The 'blue option' also 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.
Both options avoid the Appin township, however Ms Seeney said the 'blue option' was the better choice.
"We hope they make a decision quickly and adopt the blue option - we don't want them to leave residents in limbo," she said.
Campbelltown MP Greg Warren said he had advocated to both the planning and transport ministers on behalf of Appin residents.
"This is a major piece of infrastructure and will be a significant transport corridor to outer Sydney," he said.
"We would like to see the project go ahead, however we need to make sure the community's concerns are heard.
"I support residents concerns about the yellow option, even the data and documents appear to support these concerns."
Mr Warren said it was important for Appin locals to have their say on the plan.
"All too often Appin is overlooked, so I hope this project is given the consideration it deserves," he said.
"I often have people from Appin coming to me to ask for support on road issues, for help saving the koalas, to advocate for better infrastructure - and I am happy to support the community here."
Transport for NSW would not confirm how many properties may be affected by either option when asked by the Advertiser in December last year.
"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."
Community consultation will close on Friday, January 29.