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Multnomah County Design and Construction Manual<\/SPAN><\/P>

1.1.1 Roadway Functional Classification <\/SPAN><\/P>

The Multnomah County Comprehensive Framework Plan\u2019s Policy 34: Trafficways and the Functional Classification of Trafficways Map, includes nine roadway functional classifications, four within the broad arterial classification (principal, major, minor, and rural), three within the collector classification (major, neighborhood, and rural), and two within the local street classification (urban and rural). A brief description of each classification is presented in this section. In addition, a range of design treatments that can be accommodated within each functional classification will be described in subsection 1.1.2 of this manual. For a more detailed description of each functional classification, see Policy 34: Trafficways and the Functional Classification of Trafficways Map. <\/SPAN><\/P>

Arterial streets comprise the regional roadway network, and provide for travel between communities in the County, and between counties. Arterial streets accommodate the full array of travel modes including the regional bikeway system, fixed-route transit network, goods delivery and higher volume automobile traffic than collector streets. Principal Arterial Streets connect to freeways and highways that serve travelers without an origin or destination in the County. This interstate and interregional traffic, including trucks, is in addition to regional traffic traveling between cities and counties, and traffic generated by intensive and higher density land uses along the arterial corridor. The ability to move auto, truck, and regional bicycle traffic is preserved. Major Arterial Streets carry high volumes of traffic between cities in the County as part of the regional trafficway system. Priority may be given to transit- and pedestrian-oriented land uses by way of regional boulevard design treatments. Design and management of major arterial streets emphasizes preservation of the ability to move auto and transit traffic by limiting accesses while also accommodating regional bikeways and pedestrian movements. Minor Arterial Streets are the lowest order arterial facility in the urban regional street network. They typically carry less traffic volume than principal and major arterial streets, but have a high degree of connectivity between communities. Minor arterial streets provide major links in the regional road and bikeway networks; provide for truck mobility and transit corridors; and may serve as significant links in the local pedestrian system, especially where they are designed as community boulevards. Rural Arterial Roads are the primary means of access into the County\u2019s large rural districts, and often connect between counties to accommodate through movements. Rural arterial roads connect to freeways or highways, and link rural collector and local roads to the urban area and other regions. Rural arterial roads carry greater traffic volumes than rural collector roads, including commuters and other homebased trips, natural resources involving trucks, and recreational trips involving autos, bicycles, and equestrians. Multnomah County Design Standards Part I \u2013 Design Manual 1 - 2 <\/SPAN><\/P>

Collector streets distribute traffic between local streets and the arterial street network. They are not intended to serve trips without an origin or destination inside the County. Collector streets provide for automobile, bicycle and pedestrian circulation, and basic transit service. Major Collector Streets serve several purposes including linking neighborhoods to the regional system of bicycle and automobile streets, and basic transit service. They typically provide direct access between residential and commercial developments, schools, and parks. Neighborhood Collector Streets provide access primarily to residential land uses and link neighborhoods to higher order roads. They generally have higher traffic volumes than local streets but through or nonlocal traffic is discouraged. Rural Collector Roads distribute automobile traffic over large areas and generally connect to urban streets or rural arterial roads. They may also provide for recreational trips by auto, bicycle, and equestrian. Local Streets Local streets provide access to abutting land uses and do not serve through traffic. Local streets may be further classified by adjacent land use, such as residential, commercial, and industrial. Their primary purpose is to serve local pedestrian, bicycle, and automobile trips in urban areas. In rural areas, local roads serve automobile and farm circulation, as well as local pedestrian, bicycle, and equestrian uses. 1.1.2 Roadway Design Treatments Metro\u2019s Regional Transportation Policy\u2019s \u201cRegional Street Design Goals and Objectives,\u201d provides design guidelines for streets in the region. The County\u2019s roadway design treatments have incorporated Metro\u2019s Street Design Guidelines. (For detailed description of each treatment, see Metro\u2019s \u201cStreet Design Guidelines for 2040\u201d and the Regional Street Design map in the current Regional Transportation Plan.)<\/SPAN><\/P>

Boulevards serve the multi-modal travel needs of the region\u2019s most intensely developed activity centers, including regional centers, station communities, town centers and some main streets. Boulevards are the continuation of the regional street network within more intensively developed activity centers. Boulevards are designed with special amenities that promote pedestrian, bicycle, and public transportation travel in the districts they serve. Boulevards are classified as regional and community scale designs. Regional boulevards are designated on specific major arterial roadways while community boulevards are designated on specific minor arterial roadways. Regional and community boulevards are located within the most intensely developed activity centers with development oriented to the street. These are primarily regional centers, town centers, station Multnomah County Design Standards Part I \u2013 Design Manual 1 - 3 communities and some main streets. Regional boulevards consist of four or more vehicle lanes, balanced multi-modal function, and a broad right of way. Features highly desirable on regional boulevards include on-street parking, bicycle lanes, narrower travel lanes than throughways, more intensive land use oriented to the street, wide sidewalks, and landscaped medians. Community boulevards consist of four or fewer vehicle travel lanes, balanced multi-modal function, narrower right of way than a regional boulevard, landscaped medians, no on-street parking, narrower travel lanes than throughways, more intensive land use oriented to the street, and wide sidewalks. <\/SPAN><\/P>

Streets serve the multi-modal travel needs of corridors, inner and outer residential neighborhoods and some main streets. Streets typically are more vehicle-oriented and less pedestrian-oriented than boulevards, providing a multi-modal function with an emphasis on vehicle mobility. Streets are classified as regional and community designs. Regional streets are designated on specific major arterial roadways, while the community streets are designated on specific minor arterial roadways. Regional streets consist of four or more vehicle travel lanes, balanced multi-modal function, broad right of way, limited on-street parking, wider travel lanes than boulevards, land use set back from the street, sidewalks with pedestrian buffering from street, and a raised landscaped median or, usually a continuous two way left turn lane. Community streets consist of two to four travel lanes, balanced multi-modal function, narrower right of way than regional streets, on-street parking, narrower or fewer travel lanes than regional streets and residential neighborhood and corridor land use set back from the street. Community streets provide a higher level of local access and street connectivity than regional streets. Community streets have the greatest flexibility in cross sectional elements. Depending on the intensity of adjacent land use and site access needs, community streets can have three different median conditions; center two way left turn lane, narrow landscaped median, or no median. <\/SPAN><\/P>

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