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 specific aims of this study were (1) to supply documentation of statistical repeatability and precision of the rainfall-simulator and to document the statistical repeatabiity of the soil-loss data when using the previously recommended tentative laboratory test procedure, (2) to reevaluate, if necessary, the design and operation of the rainfall-
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The purpose of this study was to obtain an understanding of the behavior and stress distribution in the haunch region of a rigid frame highway bridge. A finite element model of the haunch of the bridge was developed to permit the prediction of stress levels within the haunch region. Loadings on this region were determined using an analytical model
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This study sought to measure the extent of existing ridesharing programs among Virginia industries, the potential for additional ride sharing, as presently perceived by management, and the type of information thought to be most useful to firms considering ride-sharing programs. A survey questionnaire was distributed to all manufacturing and mining
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This report describes a new type bridge deck expansion joint which was recently installed on a Rte 95 interchange bridge (Ramp N) at Petersburg. Details of the installation of the ON-FLEX joint are given and recommendations concerning possible modifications to the general installation technique are offered. It is suggested that these recommendation
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In recent years more than one-third of the nation's annual traffic fatalities have resulted from vehicle crashes with roadside obstacles. The purpose of this study was to determine if criteria developed for identifying roadside hazard locations in a Georgia study could be applied in Virginia to reduce the number of these crashes. Basically, the stu
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In 1974, legislation enacted by the General Assembly to expand the responsibilities and duties of the former Virginia Department of Highways, with the main new assignment being in the area of planning. The agency was now designated the Virginia Department of Highways and Transportation, and was charged with the responsibility of developing and coor
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A questionnaire survey was conducted to determine the types of traffic signal controls utilized by state and local agencies. The majority of the equipment was found to be supplied by three manufacturers; however, there are hundreds of different pieces of control equipment in use. Much of the equipment is quite old, and while it is relatively simple
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After reviewing R. N. Robertson's report on "An Investigation of Streaking of Highway Traffic Signs," the Traffic Research Advisory Committee recommended that an evaluation of the Department's sign post paints be conducted. In the evaluation that was subsequently undertaken, special attention was focused on the residues formed due to chalking by th
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This report is concerned with the field installation of prestressed panel subdecks on the Rte 220 bridges over relocated 23rd St. in the city of Roanoke. These were the first bridges to be constructed in Virginia utilizing the precast subdeck panel construction technique. The field study was conducted as a follow-up to the original study which resu
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This report gives the results of a survey made of industries in the Richmond Regional Planning District to determine the current and expected ride-sharing activities there and the type of information deemed most useful in planning ride-sharing programs. Present ride-sharing activity was found to consist predominantly of carpools organized by the em
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A 40-foot clear span, standard reinforced tee-beam bridge over the Tye River in Nelson County was tested with a 23-ton, tandem axle test vehicle in July 1976. The test span was one of four identical spans making a total bridge length of 170 feet. Strain gages were placed on the bottom face of each of the four stems, on the sides of the four stems,
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The Fairfax ASAP, one of 35 federally funded, alcohol countermeasure projects designed to attack the problem of drunken drivers on the highways, was implemented at the community level in January 1972. This report summarizes the data obtained to measure the project's impact on the selected ultimate performance indicators at the end of the fifth year
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Four telephone surveys were conducted for the Fairfax ASAP in June and December of 1975 and 1976. During each, 500 ASAP area residents randomly selected from the Northern Virginia phone book were called and were interviewed using standard questionnaires. Differences between survey results were examined through the analysis of individual items and t
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Over a four-year period beginning in 1970, wrong-way incidents and accidents on Virginia's interstate highways were reduced by 50% and those on non-interstate 4-lane divided highways by 70%. However, since 1975 an upward trend has been observed on interstate roads while the downward trend has continued on non-interstate roads. The report discusses
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This report describes a project in which approximately 6,200 tons (5,630 Mg) of asphaltic concrete were recycled through a conventional asphalt batch plant. During the construction of the project, a buildup of asphalt-coated fines occurred in the dryer and the dust collector. The buildup is thought to have been associated with the fineness and/or t
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The limited availability of water and stringent wastewater effluent standards at rest areas led to the development of a water recycle-reuse system to treat flush water from water closets. Flush fluid for rest area water closets accounts for 95% to 97% of the rest area water requirements. For a flush fluid to be acceptable it must have no objectiona
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During nine days in late January 1974, four major metropolitan areas of the state of Virginia were surveyed in an effort to determine seat belt use by urban travelers. Observer-data collectors were stationed at selected signalized intersections. Motorists in the lane adjacent to the curb were shown a clipboard lettered with the question "Are you we
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This report gives a preliminary evaluation of some of the factors involved in transportation energy and the potential effect of expected changes in the energy situation on the programs and the operations of the Virginia Department of Highways and Transportation. The objective is to provide general understanding of the broad aspects of the energy pr
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