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Seattle Center City Streetcar Workshop

Seattle Center City Streetcar Workshop. July 20, 2007. Evaluation Criteria for Seattle Streetcars. Transit Plan - Goal . … Transit every 15 minutes … 18 hours a day … 7 days a week …. Existing and Future Transit. Seattle Candidate Streetcar Corridors.

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Seattle Center City Streetcar Workshop

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  1. Seattle Center City Streetcar Workshop July 20, 2007

  2. Evaluation Criteria for Seattle Streetcars

  3. Transit Plan - Goal … Transit every 15 minutes … 18 hours a day … 7 days a week …

  4. Existing and Future Transit

  5. Seattle Candidate Streetcar Corridors • All UVTN routes are initial candidates for streetcar service. • Today: • Criteria Evaluation • Mapping Exercise

  6. Screening Criteria • Grade • Street Geometry • Physical Barriers • Possible Terminal Location • Utilities • Volume/Capacity Ratio • Duplication of Service • Transit-Supportive Land Uses • Industrial Zoning

  7. Grade • Grades inhibit streetcar operations • 0% to 6% - acceptable • 6% to 10% - if all other screening criteria are met • > 10% - eliminated

  8. Street Geometry • Interchanges • Turning movements (<90° unacceptable) • Weaving or curvature needs • Exclusive right-of-way needs • Transit priority needs (bridges, underpasses) • Wheel noise

  9. Other Physical Barriers • Low bridges or skyways • >14’ of vertical clearance • < 14’ of vertical clearance – fatal flaw • Narrow streets • Lane widths narrower than 10 ft is a fatal flaw • At-grade freight railroad crossing • Requires difficult approval process – fatal flaw

  10. Terminal Location • Needs reasonable location to terminate and connect to other transit: • No strong connection to transit hub is treated as a fatal flaw

  11. Utilities • Relocation of major utilities (water, storm or sanitary) may be too costly: • >6 ft from trackway • 3-6 ft from trackway • <3 ft from trackway

  12. Speed and Reliability • Traffic congestion inhibits successful streetcar • Corridor or segments with volume/lane ratios greater than the average plus one standard deviation is treated as a fatal flaw(unless exclusive ROW)

  13. Duplication of Service • Corridors that directly compete for riders with existing or programmed LRT service should be eliminated.

  14. Land Use Types

  15. Land Use Types, cont’d • “Low” transit-supportive land use: • Residential density < 10 units/acre • Industrial • Low-scale commercial development • No significant mixed-use development

  16. Industrial Zoning • Streetcar garage needs to be located on track connected to main alignment: • No industrial zoning within ½ mile of corridor is treated as a fatal flaw.

  17. Summary • Physical Barriers • Low bridges or skyways • >14’ vertical clearance • < 14’ vertical clearance • Lane widths narrower than 10 ft • At-grade freight railroad crossing • Possible Terminal Location • No strong connection to transit hub is treated as a fatal flaw • Grade • 0% to 6% - acceptable • 6% to 10% - if all other screening criteria are met • > 10% - eliminated • Street Geometry • Interchanges • Turning movements (<90° unacceptable) • Weaving or curvature needs • Exclusive right-of-way needs • Transit priority needs • Wheel noise

  18. Summary, Cont’d • Duplication of Service • Corridors that directly compete for riders with existing or programmed LRT • Transit-Supportive Land Uses • See list • Industrial Zoning • No industrial zoning within ½ mile of corridor • Utilities • >6 ft from trackway • 3-6 ft from trackway • <3 ft from trackway • Volume/Capacity Ratio • Volume/lane ratios greater than the average plus one standard deviation

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