APA Washington RDI Presentation
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APA Washington RDI Presentation



APA Washington RDI Presentation

APA Washington RDI Presentation



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APA Washington RDI Presentation APA Washington RDI Presentation Presentation Transcript

  • American Planning Association - Washington Chapter
    2009 Conference – Vancouver, Washington
    Transportation Connectivity
  • What is RDI?
    • RDI is the Route Directness Index and is calculated by dividing crow’s flight travel distances A by actual travel distances B.
    • RDI is a superior and meaningful measure of transportation connectivity.
  • Why is RDI Important?
    • The Route DirectnessIndex (RDI) can be used to quantify how well a street network connects destinations.
    • The RDI can be measured separately for motorized and non-motorized travel, taking into account non-motorized shortcuts, such as paths that connect cul-de-sacs, and barriers such as highways and streets that lack sidewalks.
    • A high RDI may indicate that streets are well connected with good sidewalks and blocks are likely relatively small so that people can travel more directly to destinations.
    • A low RDI may indicate that the street network has many unconnected dead-ends and blocks are large so people must travel farther to reach destinations.
  • How Can RDI be Applied? - Examples
    • Neighborhood Design
    • Growth Management
    • Non-Motorized Concurrency and Quality of Service
  • How Can RDI Be Applied? - Examples
    • Bike Access to LRT Station
  • How Can RDI Be Applied? - Examples
    • Access to Commuter Rail Station
  • How Can RDI Be Applied? - Examples
    • Pedestrian Access to LRT Station
  • Why Is RDI Relevant to Planning?
    Cities are exploring many transportation, land use, energy, environmental and sustainability policy issues and considering new measurement techniques:
    • Complete Streets Policy
    • Concurrency Program Refinements
    • VMT and GHG per Capita Reduction
    • Multi-Modal Level-of-Service (LOS)
    • Street Connectivity Policies
  • Why The Need For A Software Solution?
    • RDI is a simple calculation, however when applied to larger area with multiple origins and destinations, performing the calculations manually is nearly impossible.
    • Evaluating the benefits and effects of proposed pathways and sidewalk improvements is also impractical without software.
    • Existing proxy measures are inherently flawed and do not provide the accuracy and validity of an RDI analysis.
  • What Is The Value of RDIdesktop?
    • Our RDI solutions and services provide cities, counties, transit agencies and MPO’s superior methods and measurements to make better policy decisions.
  • Making Better Decisions
    • Based on the results of an RDI analysis you can identify areas of poor connectivity and test the effect of proposed improvements quantitatively in a fast and easy manner.
  • Existing Conditions
    Shared-Use Path Connections
    Average RDI Score:
    Poor / Fair
  • New Shared-Use Paths
    Shared-Use Path Connections
    Average RDI Score:
    14 % improvement
    Fair / Good
  • RDI – “Before & After” Delta
    Shared-Use Path Connections
  • More Information
    • Contact:
    Andy Mortensen: 503.313.6946
    Hicham Chatila: 206.499.8618
    Brent Turley: 208.585.1895
    Patrick Lynch: 206.979.3040