The purpose of this activity was to identify issues/risks involved in vehicle operation during the development of the Automated Highway Systems (AHS). The study primarily was concerned with evolution and deployment of AHS; and reliability and safety issues associated with in-vehicle components. To identify existing and promising AHS related compone
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This is the Interim Report in a study to demonstrate the feasibility of using cathodic protection (CP) on concrete bridge structures containing prestressed steel. Past laboratory and test yard studies had indicated that overprotection could result in the evolution of atomic hydrogen and the embrittlement of prestressing steel. Systems utilizing cat
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Although particle hopping models were introduced into traffic science in the 1950s, their systematic use has only started recently. This paper shows connections between particle hopping models and traffic flow theory. It shows that the hydrodynamical limits of certain particle hopping models correspond to the Lighthill-Whitham theory for traffic fl
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inspection of bridges for scour. It contains updated material not included in the second edition dated April 1993. This document is a revision to HEC-18 dated April 1993 which, in turn, was an update of HEC-18 dated February 1991 and of the publication, “Interim Procedures for Evaluating Scour at Bridges,” issued in September 1988 as part of the FH
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The technology applications mission of the Federal Highway Administration (FHWA) is to ensure the timely identification and assessment of innovative research results, technology, and products and the application of those that are determined to be of potential benefit to the highway community. The technology applications program involves all areas o
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Research and Special Programs Administration, John A. Volpe National Transportation Systems Center (Volpe Center), Acoustics Facility, in support of the Federal Highway Administration (FHWA) and 25 sponsoring state transportation agencies, conducted the National Pooled-Fund Study (NPFS), SP&R 0002-136, titled "Highway Noise Model Data Base Developm
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This document provides guidelines for identifying stream instability problems at highway stream crossings and for theselection and design of appropriate countermeasures to mitigate potential damages to bridges and other highway componentsat stream crossings. It is a metricated update of the version published in 1991 under Contract No. DTFH6 1-89-C-
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Ecosystem management recognizes the interrelationship between the natural environment and healthy, sustainable economies, and emphasizes the integration of planning for the protection and preservation of both. The Intermodal Surface Transportation Efficiency Act of 1991 (ISTEA) includes measures and policies requiring or encouraging an approach to
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United States. Department of Transportation. Federal Highway Administration
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1995-10-27
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PDF
This 1995 Status of the Nation's Surface Transportation System: Condition and Performance report is divided into six chapters and four appendices. This is the second in a series of combined documents on the condition, performance and capital investment requirements of the nation's highway, transit and maritime, waterborne transportation systems. Ke
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The Yoked Driver Study was 1 of 12 investigations conducted as part of the TravTek operational test of an advanced traveler information and traffic management system (ATIS/ATMS). The TravTek system consisted of the Orlando Traffic Management Center (TMC), the TravTek vehicles, and the TravTek Information and Services Center. The TMC broadcast updat
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Driver capabilities and limitations must be considered to ensure successful implementation of the Automated Highway System (AHS). Human factors investigations of driver performance characteristics provide the basis for determining system design configurations and features. Driver and system attributes are being assessed during the initial design an
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This is an annual report containing analyzed statistical data on motor fuel; motor vehicles; driver licensing; highway-user taxation; State highway finance; highway mileage; Federal aid for highways; highway finance data for municipalities, counties, townships, and other units of local government; and international data. This annual report is for t
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This report provides the results of a detailed investigation of environmental sensors and their applicability in highway operations. It describes the functional requirements for a weather condition detection device to be applied to the roadway infrastructure based upon current guidelines of various state and federal agencies. The report also analyz
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Blasted-steel panels were coated with two commercial powder epoxy coatings. Approximately half (80) of the coated panels were scribed; while the other half remained defect-free. All of the panels were immersed in a saturated calcium hydroxide solution containing 3.5% sodium chloride maintained at either 35 or 50 deg C. None of the unscribed panels
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This study investigated the responses of older, middle-aged, and younger drivers during performance of emergency maneuvers in an interactive driving simulator. Thirty-six drivers, equally distributed among three age groups (20-29; 35-44; 65-74) participated in the 32.2-km (20-mile) simulated drive, during which they encountered four emergency event
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