By Providence AyanfeoluwaLAGOS: Former Managing Director of the Nigerian Ports Authority, NPA, Hadiza Bala Usman, has called for a comprehensive review of Nigeria’s port tariff structure, warning that high and unpredictable charges are undermining the competitiveness of the nation’s seaports.Usman, who is Special Adviser to President Bola Ahmed Tinubu on Policy Coordination and Head of the Central Delivery Coordination Unit, said port modernisation should not be measured by the amou