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Rotorua police are threatening to introduce a quota system which will require officers to give tickets to a set number of drivers every day for not wearing seatbelts.
The threat follows a campaign in which police stopped 250 cars and found about 100 people - half of them drivers - not wearing seatbelts.
They also found 55 out of 163 children were either unrestrained or not properly restrained.
Fines worth a total of $15,000 were issued over four days.
Bay of Plenty road policing manager Inspector Ed Van Den Broek told the Daily Post in Rotorua that officers were horrified by the results.
He said police might have to introduce a quota system to raise compliance levels.
Another campaign was planned before Christmas.