Carl, who is the older sibling to Blade Runner Oscar, broke several bones, lacerated his liver and his heart while on his way back from a business trip on Friday.
OSCAR PISTORIUS INVOLVED IN NIGHTCLUB FIGHT OVER COURT CASE
According to the 29-year-old's family, he is now 'out of danger' despite the serious nature of his injuries.
Carl was travelling from Polokwane to Pretoria, a three hour journey, when he was hit head on by a car that swerved into his lane.
OSCAR PISTORIUS TWEETS FOR FIRST TIME SINCE COURT CASE
Oscar's brother has been a constant presence at the murder trial currently underway in Pretoria, to establish if the Paralympian killed his girlfriend, Reeva Steenkamp, in cold blood.
Lawyers are expected to give their closing speeches next week, before the judge retires to consider her verdict.
WHAT VERDICTS DOES OSCAR PISTORIUS FACE?
Oscar denies the murder of his girlfriend Reeva, claiming that he shot her after mistaking her for an intruder in his home.