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.
This paper reviews some of the problems associated with quality assurance for hydraulic cement concrete and the difficulties of relating the results of quality control and acceptance testing to the performance of the concrete facility. The importance of good control procedures and inspection of concrete placement by persons knowledgeable in concret
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The Virginia Department of Highways and Transportation has been designated the administering agency for UMTA's Section 16(b)(2) program of capital grants to private, nonprofit organizations for the provision of transportation to the elderly and handicapped. The Department's procedures for purchasing communication equipment and the utilization of th
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In 1974 the Research Council initiated a statewide survey of metal truss bridges to identify any with historic significance. This pioneering effort was financed with state research funds as it was intended to aid the Virginia Department of Highways and Transportation in meeting its obligations mandated by various requirements of the environmental r
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While measurements made by the Virginia Highway and Transportation Research Council, other departments of transportation, and the Federal Highway Administration have generally shown that acoustical barriers perform as predicted, public acceptance has often been less than unanimous. Some complaints that barriers do not seem to reduce noise levels ha
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This report presents the user instructions and data requirements for SIMCO, a combined simulation and probability computer model developed to quantify and evaluate carbon monoxide in roadside environments. The model permits direct determinations of the probability of violating the one- and eight-hour National Ambient Air Quality Standards for carbo
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The report describes the results of the load tests and summarizes the collection of data on the dimensional changes and moisture content of the press-lain members and the number and types of vehicles using the bridge. The results of the load tests suggest that the AASHTO load distribution is conservative. Although the rails, wheel guards and posts
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It is often practical to use limestone screenings in non-polishing S-5 surface mixes in some western areas of Virginia. Also, there has been some conjecture that limestone increases the durability of these mixes. Although the fine aggregate usually has a minimal effect on the skid resistance of bituminous pavements, there were no skid data availabl
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This report was prepared in anticipation of the Virginia General Assembly's consideration of proposals to require motorists to properly restrain their child passengers in safety devices. Three questions are discussed. First, are child restraint laws constitutional? Second, are the laws cost-effective? Third, which specific provisions tend to decrea
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Several matching techniques for ride sharing are available to serve a wide range of operating conditions. There is a need for guidelines to aid ride-sharing agencies in Virginia in selecting the most appropriate matching technique. The objective of this research was to develop such guidelines, information on the state of the art of ride-share match
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This study sought to evaluate the impact of the four basic treatment combinations of the rehabilitation component of the Virginia driver improvement program. It was found that receipt of a warning letter from the Division of Motor Vehicles had no effect on the subsequent driving records of program participants. Drivers attending the group interview
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Various guidelines that have been proposed for the operation of traffic signals in the flashing mode were reviewed. The use of existing traffic simulation procedures to evaluate flashing signals was examined and a study methodology for simulating and evaluating potential flashing signal schemes was developed. A case study is described in which the
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Two test sections, one on new construction and the other on a maintenance resurfacing project, were installed in the fall of 1980 to evaluate the proprietary product Chem-Crete. Laboratory tests and dynaflect and density measurements were performed on the experimental and control mixes and the performance was evaluated over a two-year period. Ravel
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The Virginia Department of Highways and Transportation frequently utilizes induction loops in its vehicle detector systems. Although not documented, there have been many instances of loop failure; therefore, the practices and materials used by the Department in installing loop detectors were investigated. Two field tests were undertaken- the encase
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This research effort was initiated at the request of officials of the Virginia Department of Highways and Transportation to obtain information on the performance of the precast concrete traffic barrier (PCTB) when exposed to heavy vehicles. The PCTB is a portable system used in Virginia since 1976 to separate high speed vehicular traffic and constr
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The report illustrates and evaluates the first use in Virginia of precast concrete replacement slabs for bridge decks. It shows that a bridge deck can be replaced with the precast slabs while traffic is maintained in the adjacent traffic lane. The quality of the prototype deck appears to be comparable to that of a conventional site-cast deck and, a
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This study investigated the feasibility of using neoprene pads confined by steel end caps instead of sulfur-mortar caps in compressive strength tests on concrete cylinders. The 1/2 in. (13 mm) thick neoprene pads had a 50 durometer hardness and were cut to fit in the end caps, which had an inside diameter of 6-1/4 in. (159 mm) with a tolerance of +
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Problem identification is recognized as an important component of highway safety planning. Under the NHTSA/FHWA concept, problem identification is the first step in program planning and in the development of effective countermeasure programs. The annual highway safety plan (HSP) is the major planning tool used by the Virginia Department of Transpor
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