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5D Processing

5D Processing. Blueprinting Work Group Status Update: 5.9.2013. How is 5D Helpful to CONNECT?. Approach that can be applied to the entire geographic area A means to offer feedback on the relative performance between growth scenarios A process that is responsive to the established schedule

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5D Processing

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  1. 5D Processing Blueprinting Work Group Status Update: 5.9.2013

  2. How is 5D Helpful to CONNECT? • Approach that can be applied to the entire geographic area • A means to offer feedback on the relative performance between growth scenarios • A process that is responsive to the established schedule • An approach that integrates with the CommunityViz platform

  3. Why is this process important? • Most regional travel models do a poor job of estimating walk/bike/transit trips • Responsive to desired transportation indicators • Minimizes the need to construct complicated transit networks in the TDM • The process captures traditionally unaccounted travel characteristics • 5D results give you the option of reporting additional transportation MOEs related to mode choice and trip reduction

  4. Travel Models Don’t Recognize a Difference between Places Rural Living Suburban Centers • Suburban Commercial Center • Suburban Hotel • Suburban Office Center • Regional Employment Center • Light Industrial Center • Heavy Industrial Center • Parks & Open Space • Working Farm • Rural Living • Rural Crossroads Suburban Neighborhoods • Parks & Open Space • Mobile Home Park • Large-Lot Residential • Shade Tree Residential • Small-Lot Residential • Multifamily Residential • Mixed-Density Residential

  5. Travel Models Don’t Recognize a Difference between Places Urban Districts Special Places • Town Center • Metropolitan Center • TOD District – Tier 1 • TOD District – Tier 2 • TOD District – Tier 3 • Airport • Civic & Institutional • Healthcare Campus • University Campus Urban Neighborhoods • Parks & Open Space • Urban Neighborhood • High-Rise Residential • Commercial Center • Mixed-Use Neighborhood • Mixed-Use Center

  6. Introducing the Five D’s Density • Population density • Employment density Design • CONNECT Community Types Distance • Distance to transit stops (existing and proposed) Diversity • Income Destination • Grid size

  7. Process • Grid cells earn a point value from 0 to 10 for each D • A grid cell can earn a maximum of 50 points • Point values equate to trip reductions for each zone • Results are thematically reported and/or fed back into the travel model Sample Trip Reduction Table

  8. Identifying the Spectrum of Ranges This is where we are in the process…

  9. Population Density Transit Activity Centers & Urban Core Low Medium High Rural Living & Suburban Neighborhoods Mixed Residential Neighborhoods & Walkable Centers

  10. Employment Density Mixed Use, Town Centers, and Urban Core Low Medium High Agricultural, Rural Crossroads, & Industrial Suburban Office and Retail Centers

  11. Design Low Medium High High degree of connectivity with dedicated facilities for bike and ped Disconnected network with segregated land uses Some connectivity with enhanced accommodations for walking and biking

  12. Distance to Transit • ¼ Mile High • ½ Mile Medium • > ½ mile Low

  13. Diversity (of income) • < $30,000 = 10 • $30,000 TO $50,000 = 5 • > $50,000 = 0 • Things we know: • Income influences mode choice • In some places there are strong correlations between income and transit ridership

  14. Destination– Grid cell size • 2 mile grids = Low • ½ mile – 1 mile grids = Medium • ¼ mile to 1/8 mile grids = High • Things we know: • The more congested a place, the more important trip choices become • Grid size reflects street connectivity, mixed use development, and mode split

  15. Model Integration Applying the math…

  16. Process • Grid cells earn a point value from 0 to 10 for each D • A grid cell can earn a maximum of 50 points • Point values equate to trip reductions for each zone • Results are thematically reported and/or fed back into the travel model Sample Trip Reduction Table

  17. Results: Scenario Comparison • Trip Reduction by Zones • Present Difference • Trip allocation by zone • Can be integrated with TDM • Can be integrated with CommunityViz Report Card • TDM will be run for Trend and Preferred Scenario

  18. Traditional Four Step Process Mode Choice + 5D • Travel Demand Models (TDM) consist of four key Steps • Trip Generation • Trip Distribution • Mode Choice • Assignment • 5D Process allows for additional refinement after the “mode choice” Step • Traditional trip generation provides us with person trips produced and attracted within the model.

  19. Integration with TDM Trip Generation 5D components (mixed use, income level, transit stop) Trip Distribution Person Trips Traditional Four Step Model Process Additional 5D Process Allocate trips Internal/External Allocate Trip Type (Walk, Bike, Drive) Mode Choice Traffic / Transit Assignment

  20. Final Results of Combined Approach Scenario tool, not meant to replace existing calibrated mode choice Provides decision makers with detailed information for each Scenario. We have the potential to identify: • Vehicle miles traveled • Vehicle hours traveled • Roadway delay • % of roadways that are congested • Value of time lost • Gallons of fuel wasted • Breakdown of trip types (walk, bike, drive) • Transit ridership • Total trip reduction with development types • Additional lane miles needed

  21. Discussion Stephen.stansbsery@kimley-horn.com

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