Paul Reynolds, the former chairman of Waka Kotahi the NZ Transport Agency, has resigned from the board.
Reynolds had been on the board only since February.
Cassandra Cowley has been appointed acting chairwoman.
Patrick Reynolds, also appointed to the board by the former Labour Government, has also resigned. Both names have gone from the Waka Kotahi website.
Transport Minister Simeon Brown told the Herald he had accepted both resignation.