Johannesburg - Overpayment of close to R10bn by the South African National Roads Agency (Sanral) for the Gauteng Freeway Improvement Project (GFIP) should be accounted for, according to civil rights body the Organisation Undoing Tax Abuse.

At a press briefing held at the Gordon Institute of Business Science on Monday, Outa highlighted that the project which cost Sanral R17.9bn could have cost between R8bn and R9bn.

Outa chairperson Wayne Duvenage said that the civil rights body wants to see corrective action taken and will be writing letters to relevant ministers and engaging with Sanral's management to act in the best interests of the public.