More than 60 per cent of Parramatta voters say they would use other roads instead of paying the tolls on the WestConnex motorway, according to a phone survey sponsored by a group opposing the toll-road.

The ReachTel survey of 650 residents across the federal seat of Parramatta also shows that a majority of those surveyed would prefer to spend billions on public transport projects instead of the motorway.

"People in the west clearly don't want WestConnex," said Gavin Gatenby, a member of the NoWestconnex: Public Transport group that sponsored the survey.

"This poses the bigger question: why are Labor and the Liberals continuing to support the project?."