The Highway Performance Monitoring System (HPMS) provides essential data on highway conditions, performance, and usage as well as analytical products to the entire transportation community. The HPMS was developed in 1978 to serve highway transportation data and analytical needs at the national level. The HPMS is both a statewide and a national info
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This is an annual report containing analyzed statistical data on motor fuel, motor vehicles, driver licensing, highway-user taxation, State and local highway finance, highway mileage, and Federal-aid for highways, as well as information from the Nationwide Personal Transportation Survey, and selected international data. This report has been publish
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Highway anti-icing is the snow and ice control practice of preventing the formation or development of bonded snow and ice by timely applications of a chemical freezing-point depressant. It provides a maintenance manager with two major capabilities: the capability for maintaining roads in the best conditions possible during a winter storm, and the c
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The Driver Fatigue and Alertness Study (DFAS) was the largest and most comprehensive over-the-road study ever conducted on commercial motor vehicle driver fatigue and alertness in North America. The data collection for this study involved eighty drivers in the United States and Canada who were monitored over a period of sixteen weeks. A number of w
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This Executive Summary is an overview of the Driver Fatigue and Alertness Study (DFAS), the largest and most comprehensive over-the-road study ever conducted on commercial motor vehicle driver fatigue and alertness in North America. The study provides extensive information on the alertness, driving performance, and physiological and subjective stat
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This working paper documents Task E of the present project, Task Analyses for Advanced Traveler Information Systems (ATIS) and Commercial Vehicle Operations (CVO) systems. The goal of Task E is to conduct detailed analyses of the influence of using ATIS on driving tasks for both private and commercial vehicle operators. The task analyses specifying
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This volume is the first in a two-volume report which developed design guidelines and specifications for measures to reduce or eliminate the impacts of highway runoff on surface waters. This volume documents the research performed under this project. It presents the findings of literature reviews, laboratory bench-scale testing, and actual field mo
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While cathodic protection effectively reduces or stops ongoing corrosion of reinforcing steel in concrete, applicability of this technology to prestressing steel has been limited because of concerns of possible bond loss and hydrogen embrittlement. Within this context the present research was intended as a comprehensive, multifaceted undertaking to
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This volume is the second in a two-volume report which developed design guidelines and specifications for measures to reduce or eliminate the impacts of highway runoff on surface waters. This report provides design guidelines and specifications for three types of management measures for the removal of pollutants from highway stormwater runoff. The
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This investigation addressed the identification of potential risks from highway transportation of hazardous materials that would result in severe permanent, irreparable or catastrophic consequences, and the identification of practical and implementable physical protective systems to reduce accident incidents and/or mitigate consequences. The primar
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This investigation addressed the identification of potential risks from highway transportation of hazardous materials that would result in severe permanent, irreparable or catastrophic consequences, and the identification of practical and implementable physical protective systems to reduce accident incidents and/or mitigate consequences. The primar
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The objective of this research was to develop statistical models of the relationship between traffic accidents and highway geometric elements for at-grade intersections. These models also incorporated the effect of traffic control features and traffic volumes on intersection accidents. The data base used to develop the models was obtained from the
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This study investigated the resistance and load-settlement behavior of axially loaded drilled shafts in geomaterials at the boundary between soil and rock, termed "intermediate geomaterials". The primary objective of the study was to develop or adapt simple design-level models to predict resistance and load-settlement behavior. Two models are propo
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One of the more complex issues in highway safety evaluation is how to incorporate some measure of exposure, some numerical measure of the opportunity for an accident to occur in the analysis. On a roadway section, for example, exposure might be vehicle-miles traveled (VMT). At fixed points, such as intersections, exposure might be some function of
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This circular provides a comprehensive and practical guide for the design of storm drainage systems associated with transportation facilities. Design guidance is provided for the design of storm drainage systems which collect, convey, and discharge stormwater flowing within and along the highway right-of-way. Methods and procedures are given for th
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This document is a revision of the July 1985 U.S Department of Transportation (DOT) publication entitled Guidelines for Applying Criteria to Designate Routes for Transporting Hazardous Materials (DOT / RSPA / OHMT-89-02), and reflects the new regulations regarding highway routing of non-radioactive hazardous materials (NRHM) (49 CFR Part 397). This
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The Highway Economic Requirements System (HERS) is a computer model designed to simulate improvement selection decisions based on the relative benefit-cost merits of alternative improvement options. HERS is intended to estimate national level investment requirements which assume state highway improvement selection decisions that consider the relati
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The purpose of Task A was to conduct a literature review of human factors-applicable articles associated with AdvancedTraveler Information Systems (ATIS) and ATIS-related commercial vehicle operations (CVO) systems. Specifically, TaskA was to assess existing human factors guidelines to determine their applicability to ATIS systems and identify rese
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Proceedings from the second Women's Travel Issues National Conference held in Baltimore in October 1996. This website presents series of peer-reviewed papers presented at the Conference that fall into nine substantive categories, plus Poster Sessions which contains brief abstracts of research presented at the Conference. The Proceedings conclude wi
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