Political opponents of the Baird government have seized on the release of more than 9000 pages of information about a controversial Melbourne toll road to argue the NSW government should make similar disclosures about Sydney's WestConnex motorway.

The new Labor government in Victoria this week released volumes of documents relating to the East West Link motorway, a project

The documents reveal multiple issues with the motorway that had not been disclosed by the previous state Coalition government in Victoria, including doubts about its financing and analysis showing it would cause traffic delays on other routes through Melbourne.

NSW Greens MLC Mehreen Faruqi, whose own analysis of the WestConnex project argues the government will struggle to raise its estimated $14 billion construction cost, said the similarities between the two toll roads were "uncanny".

"Both have extremely high construction costs, toll revenues that leave a massive funding gap and very dubious claimed benefits," Dr Faruqi said.