Estimating Texas motor vehicle operating costs.
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2009-10-01
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Edition:Technical report; Sept. 2007-Aug. 2009.
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Abstract:A specific Vcost model was developed for Texas conditions based on a sophisticated fuel model for light
duty vehicles, several excellent sources of secondary vehicle cost data, and the ability to measure heavy truck fuel
consumption through both experimental and survey work. The basic model was designed to address the relatively
narrow range of pavement roughness found on the Texas highway network and is free-flow, and does not accurately
measure congestion effects. The team developed a vehicle classification scheme that was suitable for TxDOT
planning and revenue forecasting. These resources led to the adoption of eight categories of light-duty vehicles and
two heavy truck types. The current Texas fleet composition was determined from 2007 VTR data and was made a
default for model use. Each cost item associated with the representative vehicle was calculated for each year of
operation up to 20 years. Six main cost categories are included in the Vcost model: depreciation, financing,
insurance, other fixed costs, repair and maintenance, and fuel. These costs fall into two categories: fixed and variable
costs. The Vcost model can provide operating cost estimates for each specific representative vehicles as well as
fleets of vehicles. The model allows the user to change key parameters so that the cost calculation is specific to any
particular situation, and can be updated as the economic or technological landscape changes. The model was
designed to provide the user with a program that looked, felt, and operated in a similar fashion to most Windows
programs and would be intuitive for the typical TxDOT user.
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