Pedestrian and Bicycle Transportation Along Existing Roads—ActiveTrans Priority Tool Guidebook (2015) / Chapter Skim
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Pages 39-50
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From page 39... ...
39 The goal of Phase I was to identify a project purpose and consider community/agency values, the availability of data, and technical resources. In Phase I, factors relevant to the identified purpose and variables to represent the applicable factors were also chosen.
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40 Pedestrian and Bicycle Transportation Along Existing Roads -- ActiveTrans Priority Tool Guidebook 1st Street) or in a separate column for each intersecting street (e.g., Main Street in the first column and 1st Street in the second column)
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ActiveTrans Priority Tool Phase II: Prioritization 41 school locations but would need to calculate the distance between each improvement location and the nearest school in order to determine the proximity. The location type of the improvement locations is a key consideration when measuring variables.
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42 Pedestrian and Bicycle Transportation Along Existing Roads -- ActiveTrans Priority Tool Guidebook community/agency values. In other words, agencies should not attempt to increase or decrease the influence of variables through scaling.
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ActiveTrans Priority Tool Phase II: Prioritization 43 Adjust Values to Fit the Common Scale Once a common scale is selected, it is necessary to adjust the raw values for each variable to fit the common scale. There are several ways to do this, depending on the distribution and relative importance of the values associated with each variable.
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44 Pedestrian and Bicycle Transportation Along Existing Roads -- ActiveTrans Priority Tool Guidebook Proportionate scaling and inverse proportionate scaling may not be appropriate if the range of values to be scaled includes outliers. In this case, proportionate scaling may result in a maximum or minimum scaled value that is much higher or lower than the next highest or lowest scaled value, which may be undesirable for a variety of reasons.
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ActiveTrans Priority Tool Phase II: Prioritization 45 Table 28 is the same as Table 27 except that the raw values are scaled using inverse quantile scaling. Please note that quantile scaling is not appropriate when multiple instances of the same data value would have to be separated into more than one quantile.
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46 Pedestrian and Bicycle Transportation Along Existing Roads -- ActiveTrans Priority Tool Guidebook to fit the selected scale. In Table 29, the raw values for a variable are ranked from low to high.
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ActiveTrans Priority Tool Phase II: Prioritization 47 from the means of other classes is maximized. The number of classes assigned depends on the chosen scale.
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48 Pedestrian and Bicycle Transportation Along Existing Roads -- ActiveTrans Priority Tool Guidebook Tip: Scale Prioritization Scores It can be helpful to scale the final prioritization scores using proportionate scaling to better understand the relationships between them. For example, if a common scale of 0 to 10 is selected, the improvement location with the highest prioritization score would get a scaled prioritization score of 10, and the improvement location with the lowest prioritization score would get a scaled prioritization score of 0.
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ActiveTrans Priority Tool Phase II: Prioritization 49 score a rank of 1, the improvement location with the next highest score a rank of 2, and so on (Table 36)
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50 Pedestrian and Bicycle Transportation Along Existing Roads -- ActiveTrans Priority Tool Guidebook Figure 9. Communicating prioritization process by mapping selected factors -- example from City of Bellingham, Washington, bicycle master plan.
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