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This graph of the combined arterial, collector and residential streets reflects the recommended <br />treatment needs for the overall street system and indicates the insufficient funding for residential <br />streets.n <br />overlay <br />The projected $182 million backlog in 10 years represents a majority of streets in the high-end <br />overlay ranges. Arterial, collector, and residential streets benefitting from past rehabilitations <br />may only require minimal work such as a thin-lift overlay; much lower in cost then overlay costs <br />used for the current analyses. <br />19 <br /> <br />