The older brother of South African Paralympian Oscar Pistorius is in hospital after being injured in a road crash, his family has said.

Carl Pistorius, 29, "was badly hurt but we are thankful that he is out of danger," the family said in a statement after the accident on South Africa's main highway yesterday evening.

His car was hit head-on by a vehicle that swerved from the opposite side of the expressway into the oncoming traffic around 120km northwest of Pretoria.

Police spokesman for Limpopo province Hangwani Mulaudzi described the accident as "very bad" and said Mr Pistorius and the driver of the other car had to be extracted using hydraulic rescue tools known as "the jaws of life".

Carl Pistorius was acquitted in May last year of culpable homicide and reckless driving over a fatal crash in 2008 in which his vehicle collided with a motorbike driven by a woman who died in hospital a few days later.

His brother Oscar, 27, is on trial accused of murdering his model girlfriend Reeva Steenkamp in the early hours of Valentine's Day in 2013.

He has said he shot Ms Steenkamp four times through a locked bathroom door in his apartment after mistaking her for an intruder.

His trial is set to resume on 7 August for closing arguments.