Seven people were killed in a multiple-vehicle crash on the N3 Toll Route near Van Reenen's Pass in KwaZulu-Natal, while five others died in an accident near Nelshoogte Pass in Mpumalanga on Saturday morning.
In the KwaZulu-Natal accident, three minibus taxis, three cars and one truck were involved in a crash that occurred at around 04:45.
According to the Road Traffic Management Corporation (RTMC), bad weather conditions contributed to the fatal crash.