This report details the activities and process by which the re-backcalculation of Long Term Pavement Performance (LTPP) General Pavement Study (GPS) test sections were completed. It details how the backcalculation program was selected, lists the GPS sections re-backcalculated, presents the results of the revised backcalculations and discusses the p
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The objective of this study was to determine the effects of display modality, level of driver interaction, and amount of information on the driving performance and system operation performance of commercial drivers. Introducing any level of interaction with an Advanced Traveler Information System (ATIS) will probably result in some level of increas
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Technological advances, changing roles of men and women in society, increases in the elderly population, and our increased knowledge of human behavior have significantly impacted our lives in the last quarter of the 20th century. Our travel behavior also reflects many of these changes in our society. The Nationwide Personal Transportation Survey (N
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The Federal Highway Administration applies its world-renowned expertise in surface transportation to safely and efficiently move the Nation’s people and goods. The agency strives to promote and enhance the quality of life and the economic vigor of the Nation by providing it with a high quality and innovative surface transportation system. FHWA’s mi
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United States. Federal Highway Administration. Office of Technology Applications
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1997-08-19
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PDF
Mechanically Stabilized Earth Walls (MSEW) and Reinforced Soil Slopes (RSS) are two modern methods of earth fill construction which are extremely cost effective and aesthetically pleasing. The basic concept behind these related methods is to combine soil, reinforcing materials made of steel or polymers and an appropriate facing to produce a composi
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United States. Federal Highway Administration. Office of Technology Applications
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1997-08-19
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PDF
Soil nailing is a technique to reinforce and strengthen the existing ground. The use of soil nails in combination with a shotcrete construction facing and a final structural facing can be a cost effective alternate to other wall types in cut situations. The purpose of this Demonstration Project is to facilitate the implementation of soil nailing in
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The Global Positioning System (GPS), in its current form, is used within the transportation industry for vehicle tracking and navigation. With the advent of a nationwide differential GPS (DGPS) service, this role will expand to include public safety, infrastructure management, mayday services, and other yet unknown applications. The U.S. Department
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This Long Term Pavement Performance (LTPP) data analysis was intended to examine, in a practical way, the LTPP database and to identify the site conditions and design features that significantly affect transverse joint faulting. Key products developed as part of this research were (1) answers to frequently asked questions regarding design features
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To learn how European countries monitor traffic, the Federal Highway Administration (FHWA) sponsor a scanning tour of the Netherlands, Switzerland, Germany, France and the United Kingdom in June 1996. The team focused on types of data collected, data collection methods, organizational arrangements for data collection, equipment and data validation
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A key design challenge faced by engineers using the 1993 AASHTO Guide for Design of Pavement Structures (AASHTO Guide) is the determination of appropriate design parameters for the subgrade and pavement materials. The Long-Term Pavement Performance (LTPP) data analysis project, Analyses Relating to Pavement Material Characterizations and Their Effe
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This is the first Federal Highway Cost Allocation Study (HCAS) since 1982. There are two key reasons for conducting this study. The first is to determine how changes in the Federal highway program and user fees which support that program have affected the equity of Federal highway user fees. The second is to coordinate this effort with the concurre
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A Regional ITS/CVO Coordination Plan outlines a strategy for the deployment of Intelligent Transportation Systems (ITS)/Commercial Vehicle Operations (CVO) technologies by a group of states with common economic and transportation needs. The Coordination Plan defines strategies to ensure that future deployments of ITS/CVO systems are consistent with
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This document provides guidelines for the review of state ITS/CVO business plans by the FHWA. The purpose of the review is to ensure that the state business plans have been developed in a manner consistent with the FHWA’s intent in awarding ITS/CVO mainstreaming funding to the states; and to assist the states in planning and deploying ITS/CVO servi
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The Model Deployment Initiative provides real-life examples of technology’s potential in metropolitan areas across the country. Investments from public and private sector partners will integrate existing ITS elements in the four sites as part of a national showcase.
This handbook, 1997 Freeway Management Handbook, is an update of the 1983 Freeway Management Handbook and reflects the tremendous developments in computing and communications technology. It also reflects the importance of Integrated Transportation Management Systems and the development of the concept of Intelligent Transportation Systems (ITS). The
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The objectives of this investigation were: to identify the limitations of existing prestressed concrete girder cross sections relative to the use of high-strength concrete; to examine the feasibility of using modified cross sections to take advantage of the high-strength concretes; to investigate the use of alternative construction systems; and to
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Trenching excavation and pipe-laying are, without a doubt, some of the most dangerous operations in construction. More than 200 people a year, in the United States alone, are killed during these operations. Machines that can reduce or eliminate the exposure of humans to these risks have the highest potentials to change the present situation. This r
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The development of advanced automation for arrival aircraft into the terminal area is being investigated for both the air traffic control (ATC) and airborne environments. For the automation to be effective and provide the best advisory information, aircraft trajectories must be accurately estimated. One way to enhance the aircraft's adherence to th
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