Police have issued almost 150 infringement notices and a series of charges following an operation into a planned boy racer event.
Operation Swarm brought officers into Whanganui from across the district to disrupt anti-social road users.
Police said staff travelled from Taranaki, Ruapehu, Manawatu, Horowhenua and the Tararua district and worked alongside bailiffs from the Ministry of Justice and vehicle inspectors from VTNZ to target and disrupt a planned boy racer event.
Five people were charged with excess breath alcohol, one person was charged with failing to stop for police and another person was charged with breach of bail.
Seven people were either forbidden to drive or suspended from driving due to behaviour on the night or excess demerits.
Fifteen unsafe vehicles were written off the road, six cars were seized for overdue fines and reparation, a further four cars were impounded and one stolen car was recovered.
Police said almost 150 infringement notices were handed out and 500 people were breath tested.
Horizons Regional Council also provided support for the operation.
"We won’t tolerate the anti-social behaviour on our roads and we will continue to target people who are intent on offending," Whanganui Area Prevention Manager Inspector Neil Forlong said.
"Road policing is everyone's responsibility - that's why we brought staff in from different areas and from different work groups to conduct this operation, and why we're working with our partners to keep Whanganui's roads safe."