Two men died while two women were left in a critical condition after a vehicle collided with a boulder on Frikkie Meyer Boulevard in Vanderbijlpark on Tuesday morning.
When paramedics and the Fire Department arrived at the scene they found the four occupants believed to be in their 20s trapped in the vehicle.
The two men who were in the front seat were declared dead on arrival.
The two women who were in the back seat were removed from the vehicle by the Fire Department using the Jaws Of Life.
The women were treated before they were transported to the nearest hospital.
The South African Police Service (SAPS) were on the scene for further investigations.