APA_WA Conference: RDI Presentation
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Transcript of APA_WA Conference: RDI Presentation
Transportation Connectivity
American Planning Association - Washington Chapter
2009 Conference – Vancouver, Washington
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 Directness Index (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 .58
New Shared-Use Paths
Shared-Use Path
Connections
Average RDI Score: Fair / Good .66 14 % improvement
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