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It drew on the city's documents and impact assessments and on interviews. The audit office found that the payment rate had gone from around 50% to 90% in 2022 since the scan cars came into use. The city aims for 90%. The audit office also found that the city tests the plate reader by its confidence scores, which stand at just over 99%. It credits the rise to the scan cars and does not separate the plate reader from the decision tree or from the officers' checks. 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