Tasmania motoring organisation RACT have publicly welcomed the two parties commitment to the bridge but favour an alternative approach to traffic management.

"While we support a feasibility study and the securing of land for projects such as this new bridge, we believe that an agreed-upon mode shift target must be met before the construction of major infrastructure projects," RACT chief advocacy officer, Garry Bailey said.

Since the announcement on Thursday, Labor, Liberals and the Greens have criticised and attacked each others proposed plans for the long awaited bridge between Riverside and Newnham.

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Liberal election spokesperson Michael Ferguson described Labor's road plan as 'unaffordable' and 'undeliverable', highlighting the absence of funding for the project from the opposition.

"Despite promising an unaffordable and undeliverable billion dollar-plus roads spendathon, Labor has failed to commit to the much-needed new Tamar Bridge," he said.

"Under our plan, design, planning, approvals and procurement processes will commence in 2023, with construction to commence in 2025 and be completed by 2028."

As part of their roads policy, Labor have committed to completing a feasibility study and starting construction on the project if elected to government.

RELATED: Liberals announce their plans for proposed Tamar Bridge

The Liberal party have committed to providing $80 million to the project and asking the commonwealth to fund the remaining $320 million in their first 100 days of office if elected.

However, Labor infrastructure spokesman Shane Broad explained that the Tamar Bridge is part of a multi-faceted approach to traffic management in Launceston.

On Thursday, Mr Broad questioned the Liberal's handling of the Tamar Bridge project, with no construction commenced on the project and a feasibility study which arrived one week from the election.

"I haven't actually seen this so-called feasibility study that the government are talking about," he said.

"They just keep promising and promising every election and they never do."

The government confirmed that boats would be able to pass under the proposed Tamar Bridge after members of the public raised concerns the bridge would block the boat access.

West Tamar Council declined to comment on the proposed plans for the Tamar Bridge project.

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