Johannesburg - Three motorbike riders and a traffic officer were injured in a series of accidents on the N3 towards Pietermaritzburg in Cato Ridge on Sunday morning, ER24 said.
Spokesperson Werner Vermaak said in the first accident paramedics found motorbike debris scattered over several lanes of the highway and three riders seriously injured after crashing into each other.
A traffic officer and a colleague were sent to cordon off the area and alert traffic, but apparently an articulated truck came bearing down on them.
The driver of the traffic vehicle managed to get away in time, but not the passenger.
The truck crushed her inside the vehicle and it took fire and rescue services about 40 minutes to get the seriously injured woman out of the wreckage.
The truck driver was not injured.
The motorcyclists were taken to hospital for further treatment.