01554431

Component

https://doi.org/10.3141/2503-17

Vehicle weight is one of several factors that affect vehicle emissions. Vehicle weight is especially important when modeling emissions from heavy-duty trucks (HDTs). The motor vehicle emission simulator (MOVES) model provides a way to account for vehicle weight during the construction of vehicle emissions inventories. To date, vehicle weight has not received much attention, although reliable vehicle weight data have become increasingly available in the past several years with the deployment of weigh-in-motion (WIM) technology. This study developed a method for fusing vehicle weight data from WIM stations and traffic data from vehicle detector stations (VDS) to obtain HDT activity data for input in MOVES as vehicle operating mode distributions. The study identified trucks recorded by a WIM station that were likely to travel over a VDS during a specified time period. The measured weight data of the trucks were fused with the second-by-second speed and acceleration values in truck trajectories that were created based on the knowledge of truck traffic speed at the VDS. The study used freeways in Los Angeles County, California, as a case study. The case study showed that the distributions of vehicle operating mode were quite different between the proposed method and the existing method, which assumed an average weight value for all HDTs in the same class. In the example case illustrated in this paper, the proposed method resulted in 78% higher nitrogen oxide emissions and 30% higher particulate matter emissions than the existing method.

01578185

15-5825

English

pp 153–162

2015

Transportation Research Record: Journal of the Transportation Research Board

9780309295802

Print

Figures (8) ; Maps; References (14) ; Tables (2)

Case studies; Heavy duty trucks; Pollutants; Traffic data; Traffic speed; Vehicle detectors; Vehicle weight; Weigh in motion

Motor Vehicle Emission Simulator (MOVES)

Los Angeles (California)

Energy; Environment; Highways; Motor Carriers; Vehicles and Equipment; I15: Environment

TRIS, TRB, ATRI

Dec 30 2014 1:57PM

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