Assessing Interactions Between Access Management Treatments and Multimodal Users (2018) / Chapter Skim
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Pages 114-149
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114 A P P E N D I X C : A S S E S S M E N T O F D A T A A N D I N F O R M A T I O N N E E D S Assessment of Data and Information Needs Introduction This appendix describes the process used to identify access management (AM) techniques that should be studied in Phase 2 of the project.
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115 indicate which of the relationships are documented in the literature (i.e., "Yes" if quantitative, "Trend" if qualitative) , which ones are undocumented but may be developed through research (i.e., "Possible")
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116 Technique (listed by ID code1) Does Technique Implementation have an Effect on...3 Application Scale Data Source the Operation (or LOS)
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117 Technique (listed by ID code1) Does Technique Implementation have an Effect on...3 Application Scale Data Source the Operation (or LOS)
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118 Technique (listed by ID code1) Does Technique Implementation have an Effect on...3 Application Scale Data Source the Operation (or LOS)
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119 Technique (listed by ID code1) Does Technique Implementation have an Effect on...3 Application Scale Data Source the Operation (or LOS)
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120 The information in the last three columns of Table 70 is discussed in a subsequent section. The terms data source and application scale are described more fully in Chapter 3.
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121 Technique Category Technique 10. Control driveway design elements a.
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122 Frequency of Implementation The agency survey included a question that asked the respondents to indicate which of the 16 technique categories are being used in their jurisdiction. The respondents provided a "Yes/No" indication for each category.
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123 Using this equation, the survey results were reduced to one equivalent response (i.e., some impact on safety, operations, or both) for each travel mode.
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124 Sneed,c = score for information need for technique category c. Technique Utility The survey questions focused on technique categories (as opposed to individual techniques)
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125 Table 72. Estimated utility and development cost by technique for Stage 1.
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126 Technique (listed by ID code1) All Techniques Selected Techniques U til ity Pr ob ab ili ty o f Su cc es s Ex pe ct ed U til ity Performance C os t o f S tu dy Te ch ni qu es Se le ct ed To ta l U til ity To ta l C os t O pe ra tio n Sa fe ty B-2-2 Construct a bypass road.
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127 Technique (listed by ID code1) All Techniques Selected Techniques U til ity Pr ob ab ili ty o f Su cc es s Ex pe ct ed U til ity Performance C os t o f S tu dy Te ch ni qu es Se le ct ed To ta l U til ity To ta l C os t O pe ra tio n Sa fe ty B-5-3-4 Install two two-way driveways with limited turns in lieu of one standard two-way driveway.
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128 Technique (listed by ID code1) All Techniques Selected Techniques U til ity Pr ob ab ili ty o f Su cc es s Ex pe ct ed U til ity Performance C os t o f S tu dy Te ch ni qu es Se le ct ed To ta l U til ity To ta l C os t O pe ra tio n Sa fe ty B-7-17 Install additional exit lane on driveway.
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129 The availability of existing performance relationships in the literature was considered in the cost estimate. This availability was identified during the literature review (refer to columns 2 to 9 in Table 70.
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130 The 15 techniques were supplemented by five additional techniques identified through the application of the research team's professional judgment. These techniques came from categories which were assigned lower utilities on the basis of the practitioner survey results, but which nevertheless were judged to have potential merit to study.
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131 Table 74. Top 20 AM Techniques selected in Stage 1.
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132 Frequency of Implementation The agency survey included a question that asked the respondents to indicate which of the 16 technique categories are being used in their jurisdiction. The respondents provided a "Yes/No" indication for each category.
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133 Table 75. Survey responses regarding safety or operations impact of Technique 1a.
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134 equivalent response (i.e., some impact on the safety, operations, or both of one or more modes)
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135 Cost Assessment Procedure – Stage 1 The following example is used to illustrate the cost assessment for Technique 1a - Establish traffic signal spacing criteria. Table 70 indicates that the data source for the operations-based performance measures is simulation.
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136 effect of the technique on the corresponding travel mode. Those combinations of technique-and-mode for which a relationship was identified during the update are identified by the underlined "Yes" in Table 76.
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137 Technique (listed by ID code1) Does Technique Implementation have an Effect on...3 Application Scale (Study Method4)
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138 Initial Study Design An initial study design was developed for each of the 20 techniques selected in Stage 1. The initial study design provided a study description and identified the major elements of the study design.
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139 Refinements to the Cost Assessment Procedure The cost of developing the needed performance relationships for a given technique were reassessed for Stage 2 based on consideration of the analysis scale, study method, data source, number of unknown performance relationships, and the status level associated with each known relationship. The refined cost assessment procedure included some simplifying assumptions that provided sufficient accuracy to meet the objectives of Stage 2.
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140 Table 77. Estimated utility and development cost by technique for Stage 2.
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141 1 – Technique ID codes are referenced to NCHRP Report 420 (Gluck et al., 1999)
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142 Table 78. Techniques selected in Stage 2.
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143 rank was assigned on a technique-by-technique basis, with consideration of the utility of the collective set of associated performance relationships. This approach recognized that an economy-of-scale was likely to be realized when research is undertaken to develop all needed relationships for a given technique.
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144 Table 80. Information about influence of supplemental techniques on operations and safety.
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145 Utility Assessment Procedure The utility assessment procedure consisted of the use of survey results to develop a score for each of the three components of utility. The utility was then based on the average of the three scores.
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146 travel, combined with the relatively low pedestrian, bicycle, and truck volumes at driveway in suburban areas (where variations in driveway width and radius are typically found)
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147 Table 82. Final list of techniques for further study in Phase 2.
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148 4, 7, and 8 of Table 80 (and prior versions of this table) , corner clearance was not believed to have an effect on the operation or safety of pedestrian and bicycle modes.
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149 Further discussion occurred at the panel meeting to identify those techniques for which (1) performance information is most needed by practitioners and (2)
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