Development of Tools for Assessing Wider Economic Benefits of Transportation (2014) / Chapter Skim
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21 Technical Guide Introduction and Purpose The purpose of the Reliability Module is to allow users to assess quickly the effects of highway investments in terms of both typical travel time and travel time reliability. In the past, economic assessments have been made strictly on the basis of typical travel time, but current research shows that travelers also value reliability of travel time.
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22 characterize industrial processes. With this view, it is necessary to define what "failure" is, in terms of travel times.
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23 has been demonstrated by empirical studies. Variability in the costs which are acceptable to different travelers for different trips suggests that this value is not uniform for all types of trips (Waters 1992)
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24 Table 3.1. Past Research on the Value of Reliability: Passenger Travel Authors Study Type Reliability Ratio (personal auto use)
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25 Economic Analysis Data • Unit cost of travel time, personal ($/hour) : default = $19.86 (HERS-ST Highway Economic Requirements System -- State Version: Technical Report, 2005)
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26 Calculate HCM p Capacity (if not directly input) for Freeways and Multilane Highways Without Signals: p p=Capacity IdealCap (3.2)
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27 Table 3.4. Hourly Traffic Distributions Hour Ending Freeway, Weekday Other, Weekday AADT/C AADT/C LE 7.0 7.1–11.0 GT 11.0 LE 7.0 7.1–11.0 GT 11.0 Peak Direction Peak Direction Peak Direction Peak Direction Peak Direction Peak Direction A.M.
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28 Compute the Recurring Delay in Hours per Mile: ) (= −RecurringDelayRate 1 FreeFlowSpeed (3.9)
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29 AVMTVT = HourlyVolume p SectionLength p Pct p 260; and Pct = percent of trucks in traffic stream (for commercial traffic) or 1 - percent of trucks in traffic stream (for passenger travel)
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30 Table 3.5. Incident Management Impacts Improvement Impact Incident Management (IM)
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31 Figure 3.3. Screenshot of Trust Center settings.
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32 4. In the Scenario Inputs window, click New Scenario.
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33 4. Click OK.
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34 Table 3.7. Input Fields and Their Meanings -- Tab 2 Field Name Req?
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35 • Total Annual Weekday Congestion Costs -- Total annual weekday delay cost incurred by congestion, categorized by congestion types (recurring and unreliability costs) and vehicle types (passenger and truck)
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36 scenario, click in the column containing the desired scenario and then click Details. In the case shown in Figure 3.9, clicking Details would show hourly results for scenario "Freeway," because a cell in the column with the results for "Freeway" has been selected.
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37 Figure 3.10. Screenshot of the Details view of RESULTS -- Tab 3.
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38 Figure 3.11. Screenshots of Calculation Debugger.
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