Australians will have a clearer idea of what kind of tax they'll have to pay for driving on our roads in a mere matter of weeks following the federal government's productivity roundtable.

After three days of talks in Canberra, Treasurer Jim Chalmers said he was optimistic about the level of consensus and the appetite for reform, but any hopes of major, concrete policy emerging directly from the summit were dashed.

Instead, there was a list of 10 topics of consensus and eight priority areas where the government will seek to move quickly on reform, with Chalmers saying "a lot of the hard work begins now".

One of those areas is a road user charge, which Chalmers said "there was a lot of conceptual support for".

While a final model hasn't been settled on, state and territory tre

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