APA_WA Conference: RDI Presentation

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APA_WA Conference: RDI Presentation

  1. 1. American Planning Association - Washington Chapter<br />2009 Conference – Vancouver, Washington<br />Transportation Connectivity<br />
  2. 2. What is RDI?<br /><ul><li>RDI is the Route Directness Index and is calculated by dividing crow’s flight travel distances A by actual travel distances B.
  3. 3. RDI is a superior and meaningful measure of transportation connectivity.</li></li></ul><li>Why is RDI Important?<br /><ul><li>The Route DirectnessIndex (RDI) can be used to quantify how well a street network connects destinations.
  4. 4. 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.
  5. 5. 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.
  6. 6. 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.</li></li></ul><li>How Can RDI be Applied? - Examples<br /><ul><li> Neighborhood Design
  7. 7. Growth Management
  8. 8. Non-Motorized Concurrency and Quality of Service</li></li></ul><li>How Can RDI Be Applied? - Examples<br /><ul><li>Bike Access to LRT Station</li></li></ul><li>How Can RDI Be Applied? - Examples<br /><ul><li> Access to Commuter Rail Station</li></li></ul><li>How Can RDI Be Applied? - Examples<br /><ul><li> Pedestrian Access to LRT Station</li></li></ul><li>Why Is RDI Relevant to Planning?<br />Cities are exploring many transportation, land use, energy, environmental and sustainability policy issues and considering new measurement techniques:<br /><ul><li>Complete Streets Policy
  9. 9. Concurrency Program Refinements
  10. 10. VMT and GHG per Capita Reduction
  11. 11. Multi-Modal Level-of-Service (LOS)
  12. 12. Street Connectivity Policies</li></li></ul><li>Why The Need For A Software Solution?<br /><ul><li>RDI is a simple calculation, however when applied to larger area with multiple origins and destinations, performing the calculations manually is nearly impossible.
  13. 13. Evaluating the benefits and effects of proposed pathways and sidewalk improvements is also impractical without software.
  14. 14. Existing proxy measures are inherently flawed and do not provide the accuracy and validity of an RDI analysis. </li></li></ul><li>What Is The Value of RDIdesktop?<br /><ul><li>Our RDI solutions and services provide cities, counties, transit agencies and MPO’s superior methods and measurements to make better policy decisions. </li></li></ul><li>Making Better Decisions <br /><ul><li>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. </li></li></ul><li>Existing Conditions<br />Shared-Use Path Connections<br />Average RDI Score:<br />Poor / Fair<br />.58<br />
  15. 15. New Shared-Use Paths<br />Shared-Use Path Connections<br />Average RDI Score:<br />14 % improvement<br />Fair / Good<br />.66<br />
  16. 16. RDI – “Before & After” Delta<br />Shared-Use Path Connections<br />
  17. 17. More Information <br /><ul><li>Contact:</li></ul>Andy Mortensen: 503.313.6946<br />Hicham Chatila: 206.499.8618<br />Brent Turley: 208.585.1895<br />Patrick Lynch: 206.979.3040<br />

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