United States Department of Transportation
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Edition:Final Report
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Abstract:The transportation of freight in the United States is predominantly an Interstate phenomenon. There is growing concern regarding the ability of the highway infrastructure to handle increasing traffic resulting in congestion on major trade corridors and metropolitan areas. Truck traffic contributes to worsening highway congestion at a faster rate than passenger traffic. In addition to capacity, the ageing infrastructure and limited funding for the transportation system requires sufficient and detailed knowledge of physical and operating characteristics of trucks in order to develop and implement strategies and policies directed at efficiency of the transportation system. In order to identify and develop appropriate strategies to address highway congestion and capacity deficiencies, it is important to understand the nature and characteristics of freight movement on the highway system. For the purpose of highway capacity analysis, truck and passenger trips are assigned to the highway network. This requires conversion of commodity flow data in tons of freight to truck trips based on average truck weights. The procedures and algorithms to convert the commodity flow measured in tons of units and carried by trucks to the number of trucks rely on information from the Vehicle Inventory and Use Survey (VIUS). The VIUS provides data on the physical and operating characteristics of the nation's truck population. It provides national and state level estimates of the total number by type of truck. These data are gathered through surveys conducted every five years as part of the economic census. They are not based on direct field measurement of trucks weights. The Vehicle Traveler Information System (VTRIS), on the other hand, is a database management system designed for vehicle classification and truck weight data from weigh-in-motion (WIM) installations. Presently, 36 states submit truck WIM data to the FHWA for inclusion into the VTRIS program on an annual basis. The goal of this project is to develop payload characteristics and distribution by eight gross vehicle weight classes for all 50 states and the District of Columbia using the VIUS and VTRIS WIM data (where available) for the subsequent development of truck payload equivalent factor (TPEF) for the entire United States. The objective of this project is to develop average payload databases by Gross Vehicle Weight (GVW) group, FHWA vehicle class, and various commodity groups for all 50 states using 2002 VIUS and 2006 FHWA VTRIS data. For VTRIS, analyses are limited to states that participated in the 2006 FHWA VTRIS data collection program.
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