On Wednesday morning, two trucks were set alight on the N12 highway near Daveyton in Ekurhuleni.
Two trucks were set alight on the R59 near Albertsdal in Gauteng – one just before midnight and the other after 01:00 on Thursday.
According to police spokesperson Lieutenant Colonel Brenda Muridili, in one incident, the driver was shot and is in a critical condition in hospital.
“Allegations are that both trucks were set alight by a group of six men driving a Hyundai H100,” Muridili said. “Both trucks at the time had stopped along the R59,” she added.