Guide to Truck Activity Data for Emissions Modeling (2019) / Chapter Skim
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Pages 49-60
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From page 49... ...
49 7.1 Overview "Hotelling" is defined as any long period of time that drivers spend in their vehicles during mandated down times during long-distance deliveries by tractor-trailer combination heavyduty trucks. Only the long-haul combination truck source use type (sourceTypeID 62)
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50 Guide to Truck Activity Data for Emissions Modeling of hotelling (since one-half of the long-haul combination truck population is idling during the 1-hour project period)
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Hotelling 51 hours per mile of rural, restricted-access, roadway VMT is stored in the HotellingCalendarYear table for each calendar year. The value calculated for 2011 is used as the default for all calendar years.
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52 Guide to Truck Activity Data for Emissions Modeling the national total miles driven by long-haul trucks on rural, restricted-access (freeways) roads.
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Hotelling 53 Table 7.5 shows the change in emissions using the idle rate observed in the Vnomics data versus the MOVES2014a default when run at the national scale. The lower hotelling rate reduced extended idle emissions by 96 percent.
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54 Guide to Truck Activity Data for Emissions Modeling sufficient data to represent a geographic area (county or even state) may make such a purchase prohibitively expensive.
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Hotelling 55 • Rest areas -- Information on rest area locations may be found on state DOT websites and/or through Internet search engines. • Intermodal locations -- The term "intermodal" refers to facilities that handle truck-to-ship, truck-to-rail, and truck-to-aircraft goods, as opposed to operations that only involve highway trucks.
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56 Guide to Truck Activity Data for Emissions Modeling data elements listed above for truck stops and rest areas, the following data elements need to be collected at intermodal facilities: number of trucks in the idling queue, idle duration, and peak periods of activity. Due to Department of Homeland Security measures and time constraints, it might not be possible to inspect the onsite load-out areas of every terminal, and, in many cases, field observations will only be collected at the entry gate.
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Hotelling 57 7:00 p.m.)
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58 Guide to Truck Activity Data for Emissions Modeling be established, so that truck stop data could be used as a proxy for hotelling. However, this effort was ultimately deemed unsuccessful because (1)
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Hotelling 59 Differences also were found in the temporal distribution of hotelling activity. Figure 7.1 shows the hourly distribution of trip starts and trip ends for the 383 trips in the Vnomics data set that include extended idling events, as well as the hourly distribution of truck trips used to calculate hotelling hours in MOVES.
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From page 60... ...
60 Guide to Truck Activity Data for Emissions Modeling a high of about 6 to 7 percent in overnight hours in both distributions, and a low of around 2 to 2.5 percent around midday to early afternoon. However, the Vnomics distribution shows substantially less extended idling activity between 6:00 p.m.
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