Assessing Interactions Between Access Management Treatments and Multimodal Users (2018) / Chapter Skim
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15 C H A P T E R 3 : R E S E A R C H A P P R O A C H Research Approach Introduction This chapter describes the approach used to develop performance relationships for commonly used access management (AM) techniques for which there is little existing information.
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16 in Phase 2. The final study design expands on the initial study design by identifying site selection factors, potential test sites, specific database variables, sample sizes, and data collection techniques suitable for quantifying the specified performance relationships.
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17 Category Technique (listed by ID code)
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18 Table 5. Researcher's prioritized list of techniques to study in Phase 2.
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19 Table 6. Estimated utility and development cost for four supplemental techniques.
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20 Table 7. Final prioritized list of techniques considered for study in Phase 2.
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21 Overview of Initial Study Designs This section provides an overview of the initial study design for each technique of interest. The objective of a study design is to describe the process for collecting and analysing the data needed to produce a desired performance relationship.
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22 regard, the evaluation of a technique with system-wide scale would likely require the collection of system-level data (i.e., data describing the entire system)
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23 Study Method for Corridor Analysis Analysis scale can also influence the choice of study method. Two study methods for corridor analysis were considered, they include: before–after, and cross-sectional.
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24 words, it is very possible that a city has many signalized intersections with two adjacent through lanes on each approach and no turn bays. However, any given one-mile length of arterial in a city is likely to be unique in terms of the cross section, driveway spacing, and signal density.
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25 Safety Data For safety-based performance relationships, viable sources of data include crash reports, field measurements, and simulation. Crash reports may be either a summary crash record (possibly in electronic format)
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26 Area types: urban and suburban. Primary land uses: residential, industrial, commercial business, and office.
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27 Table 9. Candidate performance measures.
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28 This section provides an overview of the final study designs associated with the techniques identified in Table 10. The research approach used for a given technique is based on the performance measure category and corresponding data source (i.e., operations or safety)
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29 Site Selection and Data Collection for Simulation Calibration The focus of the site selection and data collection activities was obtaining the data needed to calibrate the model to replicate bicycle, transit, and truck operation. Initially, a small number of sites (i.e., intersection or segment)
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30 describes the traffic characteristics, geometric design elements, and traffic control device features of the site of interest. Selected input variables are considered to be independent variables, as described in the previous paragraphs.
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31 The field data needed to calibrate the SSAM software tool included four different types of conflict for each of the transit and truck travel modes. The conflict data were extracted from the video recordings made during the field studies conducted to obtain the VISSIM calibration data.
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32 Safety Relationships Based on Crash Data This subsection provides an overview of the research approach for the development of safety relationships based on crash data. The concepts discussed in this subsection apply to the TWLTL vs.
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33 Gluck, J., H Levinson, and V
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