Guide for Identifying, Classifying, Evaluating, and Mitigating Truck Freight Bottlenecks (2017) / Chapter Skim
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From page 57... ...
57 C h a p t e r 6 6.1 Overview of Potential Causes of Truck Bottlenecks This chapter describes the process of identifying the causes of the bottlenecks that were identified using the methodology described in Chapter 5. These causes can include recurring congestion, weather, crashes, construction, and a wide variety of other causative factors.
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58 Guide for Identifying, Classifying, evaluating, and Mitigating truck Freight Bottlenecks include operating hours of gates. For locations on arterials, turning movement counts at intersections may need to be examined.
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Classifying and evaluating truck Freight Bottlenecks 59 Table 6-3 shows the calculation of delay along each of the three segments for the six time intervals. This is calculated by using the difference between the time taken to travel the segment using the reference speed and the time taken to travel the segment during the actual 1-hour period.
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Time Intervals Segment 1 Delay Influenced by Crash Segment 2 Delay Influenced by Crash Segment 3 Delay Influenced by Crash Total Delay Influenced by Crash 11:00 a.m.
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Classifying and evaluating truck Freight Bottlenecks 61 crash. Additionally, delay that occurs in time periods before the crash occurred cannot be attributed to the crash.
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62 Guide for Identifying, Classifying, evaluating, and Mitigating truck Freight Bottlenecks delay numbers provides good insight into the types of conditions that are present when delay forms. "Shared" delay also can be evenly (or otherwise analytically)
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Classifying and evaluating truck Freight Bottlenecks 63 This section provided a data analysis illustration with a simplified example. Appendix D provides more detailed analysis procedures for the calculation of performance measures.
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64 Guide for Identifying, Classifying, evaluating, and Mitigating truck Freight Bottlenecks in Texas, ranked by the total number of hours of delay occurring annually, with those statistics normalized on a per mile basis to account for the fact that each reporting segment has a different length. The "worst" bottleneck in Texas under these criteria is the Interstate 610 road segment from Interstate 10 to Interstate 59.
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Classifying and evaluating truck Freight Bottlenecks 65 maker. Rankings can even be created that are based on the relative (potential)
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66 Guide for Identifying, Classifying, evaluating, and Mitigating truck Freight Bottlenecks places to spend congestion relief money, whereas those same delays might be expressly highlighted to support the implementation of better road weather management activities, even if those activities are not applied exclusively to those road segments. The size, scope, and ranking of bottlenecks also change depending on exactly how the roadway segment encompassing the "bottleneck" is defined.
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Classifying and evaluating truck Freight Bottlenecks 67 another. The information in this table can be used to rank bottlenecks, based on subtracting the normal travel time from the worst peak-travel time.
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68 Guide for Identifying, Classifying, evaluating, and Mitigating truck Freight Bottlenecks factors for truck bottlenecks (as illustrated earlier in Figure 4-5) , agencies can compute travel times with these paths.
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Classifying and evaluating truck Freight Bottlenecks 69 number of (usually contiguous) roadway segments.
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70 Guide for Identifying, Classifying, evaluating, and Mitigating truck Freight Bottlenecks The analyst could then compare the observed congestion patterns and statistics with the existing traffic management efforts on those roadways, as well as compare those outcomes with the state-of-the-art or state-of-the-practice for mitigating the types of congestion identified in the study area. For example, if the field analysis indicated that a significant portion of "worst" travel days occurred when truck-involved crashes occurred, and the review of the incident management system did not include heavy-duty tow trucks, then one obvious mitigation approach would be to offer ways to speed access for those larger response vehicles.
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