Analytical Procedures for Determining the Impacts of Reliability Mitigation Strategies (2012) / Chapter Skim
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Pages 31-49
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31 C h a p t e r 3 Introduction The research team decided at the beginning of the project that an empirical approach would be used to develop predictive relationships for reliability. The alternative would have been to conduct a large number of simulation-based experiments.
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32 Coalition) , but it also archives the data for other uses.
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33 Table 3.2. Urban Freeway Study Sections (continued)
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34 Table 3.2. Urban Freeway Study Sections (continued)
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35 Table 3.2. Urban Freeway Study Sections (continued)
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36 Figure 3.2. Houston base map.
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37 Figure 3.4. San Francisco Bay Area base map.
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38 Figure 3.6. San Diego base map.
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39 Rural Freeways Table 3.4 presents the sections for which rural freeway travel time data were assembled. The Inrix data were deemed to have sufficient sample sizes for the two locations indicated.
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40 information gathering and reporting were their sole focus (in contrast, public agency traffic managers typically must manage incidents and crises and record relevant information at the same time)
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41 Composite scores are given for each of these areas (there are multiple attributes in each area) , as well as a single overall score.
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42 • Midday; • Week day (all hours of the day) ; and • Weekend and holiday (all hours of the day)
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43 control focused more on the overall spread of the data. Examination of the arterial data led the team to develop the following quality control processing rules, all of which were applied to the data: 1.
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44 • Quick clearance law (yes or no) ; • Property damage only move-to-shoulder law (yes or no)
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45 • Incident shoulder hours lost (annual) ; and • Mean, standard deviation, and 95th percentile of incident duration.
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46 southbound in the a.m. and northbound in the p.m.
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47 across the Ship Canal Bridge, and continues to the northern terminus of the express lanes. This section of roadway has only modest routine northbound congestion.
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48 the Kirkland–Redmond section is very directional, southbound in the morning, northbound in the evening. The roadway changes width from three GP lanes and one HOV lane north of the NE 80th Street interchange to four GP lanes and one HOV lane between SR 520 and Kirkland.
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49 The Seattle section goes from I-5 across the Lake Washington floating bridge to I-405. This section is two GP lanes.
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