An October 12 and 13, 1994 the Federal Highway Administration (FHWA), in cooperation with the American Association of State Highway and Transportation Officials (AASHTO), sponsored a workshop on highway cost allocation. Over 65 participants, including representatives of Federal and State transportation agencies, transportation industry groups, univ
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This paper recites a parable, formulates a model and devises an algorithm for optimizing tolls on a road network. Such tolls induce an equilibrium traffic flow that is at once system-optimal and user-optimal. The parable introduces the network-wide congestion pricing problem, intending to emphasize the significance of the variability of users' valu
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This manual is an interim revision of the Federal Highway Administration (FHWA) publication "Seismic Retrofitting Guidelines for Highway Bridges", which was published in 1983 as report number FHWA/RD-83/007. It describes an evaluation procedure for retrofitting seismically deficient highway bridges and outlines various measures to upgrade these str
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All culverts with openings of more than 20 ft (6.1 m), measured parallel to the roadway, must be inspected on a two-year cycle in accordance with the National Bridge Inspection Standards (NBIS). Many highway agencies also inspect smaller culverts on the same cycle. The NBIS, and prudent engineering, requires that culverts that are structurally weak
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All culverts with openings of more than 20 ft (6.1 m), measured parallel to the roadway, must be inspected on a two-year cycle in accordance with the National Bridge Inspection Standards (NBIS). Many highway agencies also inspect smaller culverts on the same cycle. The NBIS, and prudent engineering, requires that culverts that are structurally weak
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This report presents a reliability-based procedure to determine the optimal allowable loads on highway bridges considering both static and dynamic effects. A truck weight (bridge) formula was developed to provide acceptable levels of safety for bridges designed according to the 15th edition of the AASHTO specifications. Using the safety index as a
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United States. Federal Highway Administration. Office of Highway Information Management
1995-05-01
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PDF
This publication presents tabular information on State and Federal laws that provide for the taxation of motor fuel, motor vehicles, motor carriers, and licensed drivers, and the distribution of these taxes and fees. Also included are the tables that show the use of other State taxes for highways and the involvement of Federal agencies and Federal
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United States. Department of Transportation. Federal Highway Administration. Office of Research, Development, and Technology
1995-05-01
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PDF
Nationwide accident statistics show that more than 50% of fatal accidents occur during the hours of darkness. Because only 25% of travel occurs during the same period, the fatality rate is about three times higher at night than during the day. The installation of overhead lighting is a potential countermeasure to this nighttime accident problem. Ho
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This report summarizes research performed for the Federal Highway Administration covering various topics related to overcoming barriers to public-private partnerships for developing and financing highway transportation projects. Public funds have not kept pace with the demand to maintain and improve the nation's extensive network of high-quality ro
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This research synthesis is designed to summarize bicycle safety-related research and applied research since 1981 in the United States. The report has been developed for the benefit of researchers and practitioners in the field. The report updates an earlier synthesis prepared for the Federal Highway Administration in 1981. The report reviews resear
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The office of Highway Information Management (OHIM) in the Federal Highway Administration (FHWA) of the U.S. Department of Transportation publishes an annual report, Highway Statistics, that presents and analyzes national transportation statistics and trends. The report is used by numerous officials throughout the Federal, State and local governmen
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T2 is a bicriterion equilibrium traffic assignment model that accurately forecasts path choices and consequent total arc flows for a stochastically diverse set of trips. Developed around a linear generalized cost model, T2 generalizes classical traffic assignment by relaxing the value-of-time parameter from a constant to a random variable with an a
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This paper describes a process that is currently being applied to the development and assessment of an advanced air traffic control (ATC) system, the Center TRACON Automation System (CTAS). This process deviates from established practices of ATC system development: iterative field testing is conducted early in development rather than later during p
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This report describes a 4-year bridge and test fence evaluation of protective coatings for maintaining weathering steel bridges. The test specimens consisted of steel panels cut from existing aged weathering steel bridges, along with some new mill scale bearing weathering steel as a control. The condition of the specimens ranged from extensively pi
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This report documents work performed by the University of California at Davis in collaboration with the California Department of Transportation (Caltrans) in relationship to a Precursor System Analysis dealing with a study of automated construction, maintenance, and operational requirements for Automated Highway Systems (AHS). This study was conduc
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This report summarizes the research results in the Automated Check-out Activity Area. Situations in AHS where transition from automated to manual control takes place are analyzed. In particular, driver readiness testing to ensure safe and smooth transition from automated to manual control has been emphasized. We show that, by appropriate design con
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