But it does believe both are important pieces of infrastructure for Perth�s future.
WA Treasurer Mike Nahan said that after more than $20 million worth of planning since 2008, Roe 8 � the first stage of the |$1.6 billion effort to link Roe Highway to Fremantle Port � was good to go.
�We have a design, we have a route, we have EPA approval and now we have Commonwealth contribution to it and we�re getting on with the business,� he said.
Fremantle MLA Simone McGurk, among others, has called for the freight link to be scrapped and work to begin on the outer harbour.
�I think the better solution is to get on and start planning the outer harbour and to take freight away from communities and into an industrial area. That�s a solution for the 21st century. That�s where we should be putting our infrastructure dollars,� she said.
Mr Nahan said a new harbour could cost between $3-$5 billion.
Transport minister Dean Nalder said there were serious environmental concerns associated with a potential harbour in Cockburn Sound.
�People are thinking the environmental work has been done. I had it confirmed (Tuesday) � with the EPA that it would be a minimum of three years of environmental work that needs to be undertaken,� he said.
�The estimated time I�ve had on construction from my department is it would take six to seven years to construct the outer harbour.
�So we�re talking a minimum of 10 years.�
Mr Nalder said Fremantle Port could accommodate doubling freight movements but the outer �overflow� harbour would be needed.
Cockburn Mayor Logan Howlett said a container park at Latitude 32 in Wattleup was a better option than the freight link.
He said he had support from Fremantle and East Fremantle councils.
�The intermodal facility at Latitude 32 is essential and the outer harbour can flow from that,� he said.