Like to have a beer with Duncan? Perhaps don't drink at the Town And Country.

The St Peters pub, immortalised in the Slim Dusty song Duncan, faces an uncertain future because of the government's – and Roads Minister Duncan Gay's – plan for the WestConnex motorway.

"It would stuff our business, of course," pub owner Brandon Lynch said.

"And being Slim Dusty's pub, we can't have that happen, can we? You know – iconic pub."