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This data provides a high-level measure of the Route Directness Index (RDI) associated with potential roadway crossing activities in population centers. The data has been developed for generalized locations along Washington State highways. This RDI data provides planners and designers with a general, but objective measure of out of direction travel requirements for a reference trip. The data is best suited for analysis of pedestrian and bicyclist trip making at regional or statewide scales. This layer uses available network input data and does not capture all potential crossing locations or evaluate the suitability of a given crossing for active travel. |
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This data provides a high-level measure of the Route Directness Index (RDI) associated with potential roadway crossing activities in population centers. The data has been developed for generalized locations along Washington State highways. This RDI data provides planners and designers with a general, but objective measure of out of direction travel requirements for a reference trip. The data is best suited for analysis of pedestrian and bicyclist trip making at regional or statewide scales. This layer uses available network input data and does not capture all potential crossing locations or evaluate the suitability of a given crossing for active travel. |
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Washington State Department of Transportation |
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5000 |
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<DIV STYLE="text-align:Left;"><P STYLE="font-size:16ptmargin:0 0 11 0;"><SPAN STYLE="font-size:12pt">This feature class represents the routes that were used for the Route Directness Index calculation. These routes were generated by submitting the begin and end points of each RDI_Transect to the Esri routing service using the Walking Distance parameter. The service returns a route of the shortest pedestrian path between the two points. The search tolerance for the routing service was set to 400 feet, so that if there was no valid walking destination within 400 feet of the begin or end point, no route was calculated. The routing service is dependent on the Esri network data available when the service was accessed in January 2025. </SPAN></P><P STYLE="font-size:16ptmargin:0 0 11 0;"><SPAN STYLE="font-size:12pt">The Route Directness Index (RDI) is a ratio that compares the straight-line (crow-flies) distance from one point to another across a barrier to the actual distance imposed by the network of paths available to a traveler. RDI data is particularly relevant to pedestrian and/or bicyclist trips due to the extra time, physical energy, and exposure to weather that out of direction travel creates. A complete discussion of route directness, including potential applications to decision making, can be found in the Washington State Multimodal Permeability Pilot Report, August 2021 [</SPAN><A href="https://wsdot.wa.gov/sites/default/files/2021-11/MultimodalPermeabilityPilotReport-Aug2021.pdf" STYLE="text-decoration:underline;"><SPAN STYLE="font-size:12pttext-decoration:underline;">https://wsdot.wa.gov/sites/default/files/2021-11/MultimodalPermeabilityPilotReport-Aug2021.pdf</SPAN></A><SPAN STYLE="font-size:12pt">]. </SPAN></P><P STYLE="font-size:16ptmargin:0 0 11 0;"><SPAN STYLE="font-size:12pt">RDI can be analyzed at different scales. A high-level analysis of RDI can address questions that compare population centers across the state or consider whether the RDI values are generally similar within a given population center or tend to vary in different portions of a population center. High level data could be combined with other statewide data such as crash data, transit stops, level of traffic stress data, destination data, etc. to analyze potential correlations. High level RDI data is less useful for analyzing a particular crossing location or recommending solutions to address high RDI values. A more detailed analysis is likely required when questions involve corridor studies or project evaluations. Detailed location information can refer to key destinations and crossing locations that are not captured using higher level network maps.</SPAN></P><P STYLE="font-size:16ptmargin:0 0 11 0;"><SPAN STYLE="font-size:12pt">The lowest RDI is 1 because a trip between those points can be made directly along an existing roadway. The actual methodology analyzed hypothetical trips where the start and end points were about a quarter mile apart relative to a straight line. In such a situation, an RDI of 2 would mean the trip is twice the distance it might otherwise be, or about one-half mile. Although one-half mile is not particularly far, the RDI is independent of the actual distance. We might start further down the road and if the RDI remained a 2 our trip distance would be twice as long as it could have been. The RDI thus measures the real or perceived burden or travel cost incurred by a person walking or bicycling. </SPAN></P><DIV><DIV><P><SPAN /></P></DIV></DIV></DIV> |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P STYLE="margin:0 0 11 0;"><SPAN><SPAN>For Planning use only. The Washington State Department of Transportation (WSDOT) shall not be liable for any activity involving the use of the data, including, but not limited to, lost profits or savings or any other economic or consequential damages. Nor does the WSDOT warrant the fitness of the data for use for a particular purpose, or the installation of the data, its use, or the results obtained.</SPAN></SPAN></P><P STYLE="margin:0 0 11 0;"><SPAN>To the fullest extent permitted by law, the Data User shall hold harmless, defend at its own expense, and indemnify WSDOT, its officers, employees, agents, and volunteers, against any and all liability, claims, losses, damages, or expenses, including reasonable attorney’s fees, arising from all acts or omissions of the Data User or its officers, agents, or employees in its use of the WSDOT data.</SPAN></P></DIV></DIV></DIV> |
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| title:
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Route Directness Index - Routes |
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["WSDOT","WA","DOT","Washington","State","Department","Transportation","Pedestrian"] |
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en-US |
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150000000 |
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