ER24 paramedics arrived on the scene at 9:20am to find a single vehicle on its roof in the middle of the road and medics from other private services already treating several patients, ER24 spokesman Ross Campbell said.

"They were all adults, male and female. A 30-year-old female was found to have suffered critical injuries, was treated using advanced life support interventions, and transported to Metsimaholo Hospital for further care."

The local fire and traffic department services, as well as the South African Police Service (SAPS), were also on the scene, Campbell said.

ANA