The chairwoman of Sanral, Tembakazi Mnyaka, has resigned with immediate effect, the transport ministry said on Thursday.

"Transport Minister Ms. Dipuo Peters has received a letter of resignation from the chairperson of the board of directors of the South African National Roads Agency Limited [Sanral], Ms. Tembakazi Mnyaka," spokesman Tiyani Ponto-Rikhotso said in a statement.

"In a letter addressed to the minister, Ms. Mnyaka has indicated that the resignation takes effect immediately, citing personal reasons for her decision."

Peters accepted Mnyaka's resignation and wished her well in her future endeavours.

"I wish to thank Ms. Mnyaka for her efforts in ensuring that Sanral continues to discharge its mandate of building and maintaining South Africa's national road network," Peters said.