skip to main content

Search for: All records

Creators/Authors contains: "Hu, P.S."
  1. Data on travel behavior are important to determine a nation`s present travel needs and to plan for meeting its needs in the future. More specifically, data are needed to: (1) plan for the development and maintenance of the nation`s highway systems; (2) examine the availability and use of different means of transportation; (3) identify demographic and socioeconomic factors that influence travel behavior; (4) evaluate the adequacy of existing transportation facilities and estimate future transportation needs and facility requirements; and, (5) assess impacts of various policy initiatives. In the United States, the Department of Transportation (DOT) is continuing its quest formore » more current and better data. Under the coordination of DOT`s Federal Highway Administration, the 1990 Nationwide Personal Transportation Study (NPTS) was implemented to collect data to collect data on the nature and characteristics of personal travel. Commercial and institutional travel were not included in the survey.« less
  2. This issue of the publication reports the sales, market shares, estimated sales-weighted fuel economies, and other estimated sales-weighted vehicle characteristics of automobiles and light trucks for the first six months of model year 1985 and for the previous seven model years. Comparisons and observations are made on the trends in these vehicles from one model year to the next. A methodology is used to allocate the yearly mpg changes among eight components. Sales of automobiles showed an increase of 2.4% from the first half of model year 1984. An even more striking increase was observed in the sales of lightmore » trucks: 18.7% from the first half of model year 1984. Light trucks continued to claim a larger share of the entire light-duty vehicle market. Approximately 30% of the vehicles sold in the first six months of model year 1985 were light trucks. The first six months of 1985 model year experienced a gain of 0.60 mpg in sales-weighted automobile fuel economy. Light trucks also experienced a gain of 0.40 mpg in fuel economy from the previous model year.« less
  3. The Transportation Energy Data Book: Edition 11 is a statistical compendium prepared and published by Oak Ridge National Laboratory (ORNL) under contract with the Office of Transportation Technologies in the Department of Energy (DOE). Designed for use as a desk-top reference, the data book represents an assembly and display of statistics and information that characterize transportation activity, and presents data on other factors that influence transportation energy use. The purpose of this document is to present relevant statistical data in the form of tables and graphs. Each of the major transportation modes - highway, air, water, rail, pipeline - ismore » treated in separate chapters or sections. Chapter 1 compares US transportation data with data from seven other countries. Aggregate energy use and energy supply data for all modes are presented in Chapter 2. The highway mode, which accounts for over three-fourths of total transportation energy consumption, is dealt with in Chapter 3. Topics in this chapter include automobiles, trucks, buses, fleet automobiles, federal standards, fuel economies, and household data. Chapter 4 is a new addition to the data book series, containing information on alternative fuels and alternatively-fueled vehicles. The last chapter, Chapter 5, covers each of the nonhighway modes: air, water, pipeline, and rail, respectively. 92 figs., 112 tabs.« less
  4. To obtain vehicle registration data that consistently and accurately reflect the distinction between automobiles and light-duty trucks, Oak Ridge National Laboratory (ORNL) was asked by FHWA to estimate the current and historical vehicle registration numbers of automobiles and of other two-axle four-tire vehicles (i.e., light-duty trucks), and their associated travel. The term automobile is synonymous with passenger car. Passenger cars are defined as all sedans, coupes, and station wagons manufactured primarily for the purpose of carrying passengers. This includes taxicabs, rental cars, and ambulances and hearses on an automobile chassis. Light-duty trucks refer to all two-axle four-tire vehicles other thanmore » passenger cars. They include pickup trucks, panel trucks, delivery and passenger vans, and other vehicles such as campers, motor homes, ambulances on a truck chassis, hearses on a truck chassis, and carryalls. In this study, light-duty trucks include four major types: (1) pickup truck, (2) van, (3) sport utility vehicle, and (4) other 2-axle 4-tire truck. Specifically, this project re-estimates statistics that appeared in Tables MV-1 and MV-9 of the 1995 Highway Statistics. Given the complexity of the approach developed in this effort and the incompleteness and inconsistency of the state-submitted data, it is recommended that alternatives be considered by FHWA to obtain vehicle registration data. One alternative is the Polk`s NVPP data (via the US Department of Transportation`s annual subscription to Polk). The second alternative is to obtain raw registration files from individual states` Departments of Motor Vehicles and to decode individual VINs.« less
  5. This summary covers more than thirteen years of light-duty vehicle data (i.e., automobiles and light trucks combined) from model year 1976 through the first six months of model year 1989, on a nameplate level (e.g., Chevrolet Corsica is a nameplate). Included in this summary are estimated sales-weighted fuel economies, sales, and market shares of new automobiles and new light trucks sold in each model year. Comparisons and observations are made on the trends from one model year to the next.
  6. The Oklahoma Cooling Retrofit Field Test will be performed to determine the magnitude of the cooling-energy savings attributed to the installation of conservation measures as typically installed by Oklahoma's Low-Income Weatherization Assistance Program (WAP) and the additional savings that can be achieved by the installation of two cooling retrofit measures: replacement of low-efficiency window air conditioners with high-efficiency units and installation of attic radiant barriers. This report is an experimental plan presenting the specific research goals and questions to be addressed by the field test, the responsibilities of the six field test participants, 16 tasks required to complete the fieldmore » test, the experimental design, the data requirements and the instrumentation to collect the data, a data management procedure to store the data and check it for errors, and analysis procedures to be employed to study the collected data. 13 refs., 9 figs., 5 tabs.« less
  7. The National Fuel Gas End-Use Efficiency Field Test will be performed to (1) determine the performance and cost-effectiveness of a new audit-directed retrofit procedure, and (2) develop and validate analysis techniques for evaluating conservation programs that can use the daily house gas use data that can be economically collected by gas telemetering equipment. The audit procedure is designed to improve conservation programs by including mechanical system retrofits as retrofit options in addition to building envelope retrofits, determining the most cost-effective retrofits for each house through individual analysis, and following a rational decision process to determine the investment level of eachmore » house. This report is an experimental plan presenting a detailed description of the audit procedure, specific research goals and questions to be addressed by the field test, the responsibilities of the six field test participants, 16 tasks required to complete the field test, a detailed description of the experimental design, house selection and assignment procedures, a detailed description of the data to be collected and the instrumentation to collect it, a data management procedure to store the data and check it for errors, and analysis procedures to be employed to study the collected data. 15 refs., 12 figs., 3 tabs.« less
  8. This issue of Light-Duty Vehicle MPG and Market Shares Report: First Six months of Model Year 1988 reports the estimated sales-weighted fuel economics, sales, and market shares of automobiles and light trucks on a make and model basis, from model year 1976 to the first six months of model year 1988. This is the first time that data for model years 1976, 1977 and 1987 are published in this report series. Vehicle sales data are used as weighting factors in the sales-weighted estimation procedure. This enables the estimates to reflect averages for the overall new vehicle fleet. Comparisons and observationsmore » are highlighted on the trends in these vehicle characteristics from one model year to the next. Comparisons are also made on the fuel economy changes to determine the factors which have caused the changes. 3 refs., 30 figs., 37 tabs.« less
  9. The purpose of the study was to identify systematic patterns in the monthly market shares in each of the four light-duty vehicle categories: domestic automobiles, import automobiles, domestic light trucks, and import light trucks. Time series models were developed to identify the major patterns in the monthly market shares, using the ARIMA (AutoRegressive Integrated Moving-Average) modeling technique derived by Box and Jenkins. The technique identified temporal lags in monthly market shares and estimated the coefficients of both lagged and economic variables. In general, monthly trends, gasoline prices, and low-interest financial incentive programs exhibited significant impacts on monthly market shares. Lowermore » gasoline prices, the months of April, October and November, and low-interest financial incentives in August and September 1985 were associated with higher market shares for domestic automobiles. Termination of the financial incentives led to a decline of 6.9% (relative to the market share that was otherwise expected) in the domestic automobile market share. Lower gasoline prices, the months of March, October and November, and the financial incentive programs offered by domestic auto makers were associated with declines in the market shares of import automobiles. Perhaps surprisingly, the incentive programs also resulted in a decline of 3.4% (relative to the market share that was otherwise expected) in domestic light truck market shares.« less
  10. This issue reports the estimated sales-weighted fuel economies, sales, market shares, and other estimated sales-weighted vehicle characteristics of automobiles and light trucks for model year 1978 through 1986. Monthly vehicle sales data are used as weighting factors in the sales-weighted estimation procedure, enabling the estimates to reflect averages for the overall new vehicle fleet. Comparisons and observations are highlighted on the trends in these vehicle characteristics from one model year to the next. Analyses are carried out on the fuel economy changes to determine the factors that have caused the changes.
Switch to Detail View for this search