Greens MP Michael Berkman wants Queensland children to travel on public transport for free in a multimillion-dollar plan to bust congestion.

The member for Maiwar has called on the Queensland government to consider a Greens proposal to introduce free public transport for all children aged under 18.

Greens MP Michael Berkman is calling for public transport to be free for Queensland children. Credit:Fairfax Media.

"Free public transport for every kid in Queensland, from Brisbane to Cairns, would cost just $56 million per year," he said.

"Just for context, the government will spend $2.5 billion just this year on roads."