The US Transportation Collection consists of documents from across all transportation modes with specific focus on research reports from US DOT, state DOTs, and other transportation organizations.
Bookmark this collection: https://rosap.ntl.bts.gov/collection_ust or https://doi.org/10.21949/1530857.
The study was conducted in an effort to identify methods of stream monitoring for use by the Environmental Quality Division in improving its monitoring programs. A literature search was undertaken to determine the present knowledge of the effects of excess sediment on aquatic ecosystems and to investigate possible ways to monitor the impact of sedi
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This study attempted to determine the impact of the driver improvement program on Virginia's traffic and safety environment in terms of accidents and traffic convictions averted as a result of appropriate treatment, and to establish an ongoing system of data collection to be used by the Division of Motor vehicles to continually evaluate the effecti
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A telephone survey of a thousand randomly selected Virginia residents found that the automobile was the most popular mode of travel, and that more work trips than trips for other purposes were being made by alternatives such as ride sharing, public transit, and non-motorized modes. While convenience and low cost were said to be the most important f
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The objective of this research-was to develop criteria or guidelines for the treatment of right turn movements at nonsignalized intersections on rural roads. It was necessary for the criteria to be applicable for a wide range of conditions. A survey of state departments of transportation and Virginia Department of Highways and Transportation distri
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Evaluated was an approach to controlling the consolidation of in-place portland cement concrete on the basis of densities obtained with a Troxler 3411 nuclear gage. The gage was used in the backscatter mode on low-slump concrete bridge deck overlays and in both the backscatter and the direct transmission modes on continuously reinforced concrete pa
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Transit bus maintenance practices as used by thirteen small and medium-sized transit systems in Virginia were cataloged. Different approaches to maintenance were investigated and the current condition of transit bus maintenance was determined. Factors affecting the performance of transit bus maintenance were identified and recommendations were deve
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The report summarizes the objectives and benefits of formal pavement management systems and outlines an approach believed by the author to be practical for Virginia. The management of Virginia interstate pavements and a proposed random-sampling plan for the primary and secondary systems are discussed. Five recommendations directed at initiating a p
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This report provides an introduction to the methodologies of priority programming as developed by state transportation departments in their highway and transportation project selection processes. It explains the interrelationships between needs studies, long-range transportation planning, and the enumeration of system-wide goals and objectives whic
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Guardrails that are too low may fail to safely redirect errant vehicles; instead, the vehicles may vault the guardrails, resulting in severe accidents. An analysis of data on a small sample of guardrails throughout-Virginia showed that over 80% of the guardrails were lower than the current standard height of 27 in. The causes of low guardrail were
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The National Highway Traffic Safety Administration requires each state to submit an annual Highway Safety Plan as a prerequisite for obtaining federal section 402 safety monies. The Highway Safety Plan serves as more than a mechanism for obtaining funds; it induces planning, programming, and budgeting of highway safety projects at both the state an
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A comparative analysis was made of the initial brightness of seibulite brand super engineering grade and scotchlite brand high intensity grade reflective sheeting under road conditions. Overhead and ground-mounted guide signs were analyzed. Human factors were incorporated in the analysis through two subjective evaluations, and luminance measurement
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The subjective rating of the night visibility of pavement marking materials is difficult as it can be influenced by many variables. In an attempt to provide an improved method of determining the night visibility of these materials, a portable retroreflectometer was fabricated, and its precision and accuracy in determining night visibility were eval
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The objective of this investigation was to determine the effect of antistripping additives on the compaction of bituminous concrete. To do this, the densities obtained on test sections with and without additive were compared. Comparisons of nuclear densities and the void contents of cores from the pavement revealed no significant differences. Also,
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The experimental deck exhibited a significant amount of cracks in the survey done at 29 months after heat treatment. These were attributed mainly to the heating and the cooling process, as only a few cracks were observed on the control deck. Delaminations totaling about 3% of the total deck surface were found on the experimental structure at 39 mon
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This report was designed primarily to apprise persons in state agencies of the law of sovereign immunity in Virginia, to comment on the likelihood of this law being changed, and to identify the possible sources of such change. The report addresses the potential tort liability both of individual state employees and of the agencies themselves.
This report describes the experience of the Virginia Department of Highways and Transportation with the use of high range, water reduced (HRWR) concrete. A description of the installation of the HRWR concrete in two pavements and four bridge decks, along with the results of evaluative tests, is given in Appendix A. Appendix B details the evaluation
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The purposes of this project were to review and evaluate Virginia's traffic laws related to pedestrians, compare provisions of the Code of Virginia with those of the statutes of other states and the Uniform Vehicle Code, and, if appropriate, propose amendments, additions, or deletions to the Code of Virginia which would enhance safe walking in the
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Vehicle trip rates at shopping centers, apartment complexes, and subdivisions throughout Virginia were determined from seven-day volume counts. These rates were then compared with rates reported in four recognized sources of trip rate statistics and with Virginia rates developed approximately ten years ago. Within the Virginia data, the rates in th
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National Center for Statistics and Analysis (U.S.)
1981-01-01
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The Fatal Accident Reporting System (FARS) gathers data on the most severe traffic accidents that occur each year--those that result in loss of human life.
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