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CH A P T E R 2 <br />Design Considerations <br />Adiscussion of residential street design should consider a broad <br />range of factors that relate to the specifications of align- <br />ments, configurations, and construction details. The considera- <br />tions extend to criteria, specification standards, and performance <br />experience. This chapter focuses on current practices in residen- <br />tial street design consistent with the principles outlined in the <br />Introduction. <br />Street Classification System <br />Streets fall into a four - category hierarchy that, in descending or- <br />der, includes arterial, collector, subcollector, and access streets <br />(Figure 2-1). Residential streets may fit into any of these categories <br />except arterials. The functional descriptions of each of these <br />classes follow: <br />Arterial. An arterial is a high - volume street that should have no <br />residences on it (Figure 2-2). Its function is to conduct traffic <br />between communities and activity centers and to connect com- <br />munities to major state and interstate highways. <br />Collector. As the principal traffic artery within residential or <br />commercial areas, the collector carries relatively high traffic vol- <br />umes and conveys traffic from arterial streets to lower -order <br />streets (Figure 2-3). Its function is to promote the free flow of <br />traffic; as such, communities should not encourage parking or <br />residences along a collector. The collector's secondary function is <br />25 <br />Page 5 <br />