Four motorists were arrested while 16 others were fined for speeding, Johannesburg metro police said.
"Three motorists were arrested on Saturday at the N1 south bound near the Grasmere tollgate," said spokesperson Wayne Minnaar.
The three were later released on R1 500 bail while on Thursday a Saxonwold teen was also arrested.
The 19-year-old was caught speeding at 133km per hour in a 60km per hour zone. He was also released on R1 500 bail.
"We have revived our law enforcement against speeding motorist," Minnaar said. - Sapa