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Appendix A: Definitions of types of streets <br />The City's Transportation Element of the Comprehensive Plan defines the street functional <br />classifications. For the sake of this program, only residential local streets and collector arterials <br />are eligible for NTCP treatments. Streets in commercial areas or which are classified as principal <br />or minor arterials are not eligible for treatments under this program. Traffic calming on principal <br />and minor arterials is very different than on residential streets, requiring substantial design, <br />permitting, environmental approval, and budget in order to construct. These calming projects are <br />developed into standalone capital improvement projects. <br />Local streets (typical speed limit 25 mph) serve local circulation needs for motor vehicles, <br />bicycles, and pedestrian traffic and provide access to residences and some businesses. Local <br />streets are not intended to carry significant volumes of through traffic. Sixty to 80 percent of <br />the roadway network is considered local streets. <br />Collector arterials (typical speed limit 30-35 mph) are typically streets that provide access <br />between local service streets or from local streets to thorough -fares. Collectors often carry <br />some through traffic. Collectors in residential areas are eligible for NTCP treatments whereas <br />collectors in commercial areas are not. Five to 10 percent of the roadway network is classified <br />as collector arterials. <br />Minor arterials (typical speed limit 30-40 mph) are streets which are typically wider and <br />may have more lanes than collectors which connect the smaller arterial streets to destinations <br />or to the regional roadway network. Minor arterials carry a large percentage of through traffic <br />as well as traffic from the local area. Ten to 20 percent of the streets in network are minor <br />arterials. <br />Principal arterials (typical speed limit 35-50 mph) are major streets and highways that <br />provide regional connections between major destinations. Speeds are higher, access and <br />traffic control favors providing fast and smooth movement on the arterial over the lower <br />classified streets. Five to 10 percent of a roadway network is classified as principal arterials. <br />35 <br />