 The evaluation was based on a sample of 254 projects and found that the program had generated returns of around $4 to the Australian economy for every dollar spent.In 2001, the Bureau released its second evaluation of the program, which found that overall the Black Spot Program had been highly effective in reducing casualty crashes—calculating an urban benefit-cost ratio of over 18, and a regional benefit-cost ration of around 10.When the Australian National Audit Office audited DOTARS' administration of the program in 2006–07, it made nine recommendations, including three addressing governance arrangements and six focused on addressing shortcomings it had identified in program administration.