Establishing Monitoring Programs for Travel Time Reliability (2014) / Chapter Skim
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Pages 37-44
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37 C h a p t e r 3 A travel time reliability monitoring system (TTRMS) is intended to be an add-on to existing traffic management systems.
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38 be. Such systems add a new, powerful, practical traffic management tool to the arsenal of system operators.
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39 system sensor data were often available (down to 30-second intervals) , but they was not used.
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40 The study team recommends that these regimes should be based on a combination of a nominal congestion condition (e.g., uncongested or low, moderate, or high congestion) and a nonrecurring event condition (e.g., none, weather, incident, special event)
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41 congestion without inclement weather. Without inclement weather, 50% of the vehicles are traveling at 52 s/mi instead of 70 s/mi -- considerably faster.
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42 Figure 3.6: one toward the beginning of the day, and another toward the end. System detectors (e.g., loops and cameras)
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43 TTRMS has to be able to do this. Chapter 6 describes ways to combine segment-level data, but the main stipulation is that the correlation in travel times (travel rates)
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44 For AVI- or AVL-based data, it seems valuable to record segment-level CDFs on a periodic basis. Even though some researchers are experimenting with parametrically based procedures (Guo et al.
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