A secret police sting on hundreds of boy racers gathering in Hamilton at the weekend issued 200 infringement notices and impounded nine cars.
About 50 police officers from Waikato, Bay of Plenty and Counties Manukau districts gatecrashed the illegal street gathering of about 500 on Saturday night.
Waikato road policing manager inspector Jeff Penno said police took a zero-tolerance approach to the gatherings and focused on dangerous and illegal driving, compliance with driver licence conditions and vehicle safety standards.
The operation was planned after police learned hundreds of illegal street racers planned to meet in Waikato on Friday and Saturday nights.