In 1990, 2,378 accidents, or 47% of all accidents that occurred at grade crossings, occurred at passively signed crossings. This demonstrates the need for an effective passive device at railroad crossings to warn motorists and reduce the number of train-vehicle accidents. The object of this study was to determine the relative effectiveness of seven
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The objective of this study was to further the development of performance-related specifications 9PRS) for asphalt pavement construction by: (1) conducting laboratory studies of the relationships between materials and construction (M&C) variables and fundamental response variables, and the relationships between the fundamental response variables an
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United States. Department of Transportation. Federal Highway Administration
1993-12-01
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This progress report gives an overview of research and technology transfer being conducted under the Nationally Coordinated Program (NCP) of Highway Research, Development, and Technology (RD&T) from October 1, 1992 through September 30, 1993. The NCP is organized into categories, programs, and projects. The NCP categories covered in this 1993 repor
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Selection of an appropriate grout mix for filling the ducts of post-tensioned bridge structural elements is an important task that could provide long-term protection of post-tensioning steel against corrosion. Important properties of a suitable grout mix include its workability, protection against corrosion of steel, low permeability, ability to ex
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Pursuant to Section 1006(a) of the Intermodal Surface Transportation Efficiency Act of 1991 (ISTEA), the U.S. Department of Transportation (DOT) proposes a National Highway System (NHS) of nearly 159.000 miles (about 256,000 kilometres). Specific legislative language to enact the NHS and continue the intermodal of the NHS is included in this report
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Public-Private transportation partnerships have become a topic of increasing interest over the past decade. With needs outstripping limited government resources, transportation officials are looking for new mechanisms to finance badly needed infrastructure. Private sector participation in public-use projects - public-private partnerships - are one
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This report is the sixth in a series produced for the Federal Transit Administration (FTA) and the Federal Highway Administration (FHWA) by the Volpe National Transportation Systems Center (Volpe Center). This formal comprehensive review of the planning process in the Minneapolis-St. Paul (Twin Cities) metropolitan area, conducted by Federal Highwa
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This report identified the changes which have occurred from 1960 to 1990 in population and demographics, worker characteristics, means of travel to work, household vehicle availability, and geographic revisions in the United States and its large metropolitan areas. The report is based on the U.S. Bureau of the Census data from decennial data sets.
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Following the collapse of the Route 198 bridge over the Baltimore/Washington Parkway in 1989, the Federal Highway Administration (FHWA) established the temporary works research program. The program was guided by the Scaffolding, Shoring, and Forming Task Group as formed by the FHWA. The objective of this study has been to develop a guide design spe
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Following the collapse of the Route 198 bridge over the Baltimore/Washington Parkway in 1989, the Federal Highway Administration (FHWA) established the temporary works research program. The program was guided by the Scaffolding, Shoring, and Forming Task Group as formed by the FHWA. The objective of this report is to develop a guide standard specif
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1993-11-01
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Nationwide Personal Transportation Survey (NPTS)
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This report presents data on the amount, nature and characteristics of persona (non-commercial) travel by all modes of transportation in the U.S. The data is from a survey of individuals conducted throughout 1990. A large number of data relationships are presented and, therefore, the report is printed in two volumes. Volume I contains information o
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Following the collapse of the Route 198 bridge over the Baltimore / Washington Parkway in 1989, the FHWA established the temporary works research program. The program was guided by the Scaffolding, Shoring, and Forming Task Group as formed by the FHWA. The objective of this report is to develop a certification program aimed at the supplier of false
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This study continued the development of performance related specifications (PRS) for concrete pavements. Drawing upon previous work, a prototype PRS was developed that considers the expected life-cycle cost of the as-constructed pavement as the overall measure of quality. The approach calls for measurement of in situ concrete properties and explici
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This study continued the development of performance related specifications (PRS) for concrete pavements. Drawing upon previous work, a prototype PRS was developed that considers the expected life-cycle cost of the as-constructed pavement as the overall measure of quality. The approach calls for measurement of in situ concrete properties and explici
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A review of past research and accident databases, conduct of full-scale testing, and computer simulation and validation were conducted in an attempt to develop definitive guidelines for the placement of traffic barriers on curves, curbs, and slopes.
Currently, national guidelines regarding the nighttime visibility of signs are limited to the stipulation in the "Manual on Uniform Traffic Control Devices for Streets and Highways (MUTCD)" that all warning and regulatory signs be illuminated or reflectorized to show the same color and shape by day or night. There are no objective measures that can
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Currently, national guidelines regarding the nighttime visibility of signs are limited to the stipulation in the "Manual on Uniform Traffic Control Devices for Streets and Highways (MUTCD)" that all warning and regulatory signs be illuminated or reflectorized to show the same color and shape by day or night. There are no objective measures that can
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The purpose of this study is to determine the safety impact of raised curb medians, two-way left-turn lane (TWLT) medians, and undivided cross sections on vehicular and pedestrian traffic. This study concentrates on medians located on unlimited access arterials in central business districts (CBDs) and suburban environments. A total of 32,894 vehicl
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