Guide to Truck Activity Data for Emissions Modeling (2019) / Chapter Skim
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11 3.1 Overview Age distribution is characterized in MOVES as the fraction of total vehicle population with age = x, where x spans from 0 to 30 years old, and the sum of age distribution is one. For county-scale analysis, age distributions can be provided for each of the 13 source types.
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12 Guide to Truck Activity Data for Emissions Modeling Age distributions can vary across regions due to economic and climate factors, as well as the uses of regionally registered trucks. For example, older combination trucks are often retired from long-haul service and placed into use as drayage trucks serving ports.
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Age Distributions 13 the average age of combination trucks in Texas was 1.2 to 2.3 years older than the average age of combination trucks in Virginia for the same time period. The average age of combination trucks also varied by up to 3.4 years across three counties evaluated in Virginia and by up to 4.1 years across three counties evaluated in Texas (see Case Study #2)
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14 Guide to Truck Activity Data for Emissions Modeling state or regional, population-based age distributions input to MOVES for county-scale analysis. Otherwise, newer vehicles will be oversampled because they travel more.
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Age Distributions 15 inspection. It is important to note that only a small number of CMVs are inspected relative to all the vehicles that pass through a weigh station facility.
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16 Guide to Truck Activity Data for Emissions Modeling the MOVES combination truck class, and the MCMIS straight truck type description is analogous to the MOVES single-unit truck class. Note that MCMIS does not permit distinguishing between short-haul and long-haul trucks due to limited information on average daily mileage of the trucks inspected.
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Age Distributions 17 (A)
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18 Guide to Truck Activity Data for Emissions Modeling ratio of VMT per vehicle of age x to VMT per vehicle of age 0. Column (F)
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Age Distributions 19 department of motor vehicles. If multi-state registrations are to be considered, MCMIS can be used as described above, as long as both license number and state are collected as part of the survey.
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20 Guide to Truck Activity Data for Emissions Modeling 9. Determine the age distribution at the observed locations (fraction of observed vehicles by model year)
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