The Road Traffic Management Corporation (RTMC) has arrested five more officials in Lephalale, Limpopo, on charges of fraud and corruption.
The charges relate to the irregular issuing of roadworthy certificates.
The development came hours after six vehicle testing station employees from the same station were arrested on Monday for fraud and corruption.
"The five officials aged between 23 and 62, amongst them three examiners and two cashiers, were arrested in an ongoing investigation by the RTMC's National Traffic Anti-Corruption Unit, the Hawks and the Special Investigation Unit," the corporation said in a statement on Tuesday.
The officials are alleged to have used the identity particulars of unsuspecting victims to authorise roadworthy certificates for vehicles that were never physically subjected to the mandatory tests.
"The suspects are expected to make their first appearance at Lephalale Magistrate's Court on Wednesday to face fraud and corruption charges, along with the group that was arrested on Monday," the RTMC said.
More arrests can be expected in the coming weeks as the agencies seek to end the culture of impunity and wrongdoing at licensing centres, testing stations and on the road.
Members of the public are urged to report incidents of fraud and corruption on 0861 400 800.