WA Main Roads denies sign destruction

Main Roads has denied removing signs protesting the proposed $1.6 billion Perth Freight Link from private property.

Fremantle MLA Simone McGurk said she had received reports a government worker had torn down a sign from a Palmyra home, which stated `save our castle'.

A Main Roads spokeswoman said officers had not removed the sign in question but confirmed six campaign signs had been removed from road reserves, bridges and trees in the area, after being deemed distracting to motorists.

"Main Roads does not condone the unauthorised removal of Rethink the Link campaign signs," the spokeswoman said.

Greens MP Lynn MacLaren called for the urgent suspension of the Freight Link and will table a petition containing more than 1400 signatures in parliament later on Tuesday.

Several groups have voiced their opposition to the federally-funded project including the Maritime Union of Australia, Member for Perth Alannah MacTiernan, environment groups and residents who have been warned their homes may be resumed to make way for the road.

Separately on Tuesday, opposition spokeswoman Rita Saffioti told reporters the Transport Department's director-general had refused to give the Senate documents it had requested regarding the project, including the business case used to justify it.

She said it showed more "secrecy" by the state government, and taxpayers had a right to know where their money was going.