National will overturn the coalition Government's regional fuel tax if it gets into power in 2020, leader Simon Bridges says.

In his first economic speech as leader, Bridges also said he would get rid of the $3 billion Regional Development Fund led by Shane Jones.

Labour announced plans earlier this month to introduce a fuel tax of between 9c and 12c per litre over three to four years to pay for its 10-year transport plan. It is set to come into force in July.

Bridges said this morning the tax was an unfair measure and would cost a typical Auckland family $700 a year.

"Regional fuel taxes are unfair on New Zealanders. They are regressive, and hit poorer New Zealanders the hardest," he said.

His party would instead fund new infrastructure through the national budget.