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.
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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Reduced visibility resulting from fog presents a very hazardous condition on the highway because of the inability of motorists to readily observe pavement markings and signs and the movement of traffic. Afton Mountain, which is traversed by I-64, often is the site of such reduced visibility because of the low cloud covering the mountain top during
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The Department spends approximately a half million dollars annually on reflective sheeting for highway signs. For years this sheeting has been purchased primarily from one manufacturer, because of the inability of other firms to produce a competitive product. However, during the past two years, a number of other manufacturers have been submitting r
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Through selected case studies, this report illustrates how the inadequate visibility of road signs and pavement markings at night contributes to wrong-way driving. A concept termed "keg of legibility" for visibility at night has been developed by the author to delineate the limits of night visibility under low beam headlights. The report discusses
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An 18-month field test was conducted to determine if the Virginia Department of Highways & Transportation should give serious consideration to the use of methanol as a substitute for gasoline in the operation of its motor vehicles. Five of the eight 1973 and 1974 model vehicles involved in the test were operated for a total of 92,000 miles on a fue
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A photolog system was pilot tested to obtain data for a comparison of the costs of a statewide photologging program with those incurred in other methods of recording roadway information.
Through traffic in residential subdivisions results from motorists seeking shortcuts between two arterial roads, or trying to avoid saturated intersections of two arterial roads. Control techniques to reduce through traffic could be classified into internal, peripheral, or distributed within the residential areas. Internal traffic controls and cont
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A nationwide questionnaire survey on use of 4-way stop signs and reversed stop signs to reduce through traffic in residential areas elicited responses from 141 governmental agencies including state highway departments, urban counties containing cities with a population of more than 150,000, and cities with a population of over 400,000. A tabulation
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This report describes the performance of fabrics used under overlays in an effort to minimize longitudinal and alligator cracking in flexible pavements. It is concluded, although the sample size is small, that the treatments will extend the pavement life an average of about two years.
Along a section of Interstate 77 in Carroll County, in the mountainous region of southwestern Virginia, it was necessary to construct a fill approximately 258 ft (78 m) deep. The flow of a mountain stream had to be carried through this massive embankment and, because of the nature of the terrain, it was decided to use a temporary steel culvert and
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This volume consists of what was originally intended as the introductory chapters of the Albemarle road history. Since most readers are probably unfamiliar with the history of roads in Virginia, it was thought proper to devote the first section of that work to a sketch of the development of road transportation here up to the coming of the period of
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The purpose of this study was to find or develop a test that would identify a very tough but relatively rapid weathering type of shale that has caused problems when used in embankments as rock. Eight shales, including the problem shale, were collected and tested by the slake, slake durability, and modified sulfate soundness tests, and a new sulfuri
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In response to Value Engineering Proposal #M-26, a study of the feasibility of adopting a 10 ft. mark 30 ft. gap centerline pattern for use on 2- and 4-lane rural roads was conducted. The study included a literature review, field studies of traffic speed and lateral placement on rural highways, a motorist opinion survey, an estimation of expected m
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A system for management evaluation of Virginia's periodic motor vehicle inspection (PMVI) program was developed which is similar to that currently in use by the Virginia Department of State Police, except for changes in the sample size of inspection receipts and a modification of the procedure for sampling inspection receipts. Using the procedure d
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Epoxy coated deck reinforcement was evaluated during the construction of two bridges on Rte. I-77 in Carroll County. The contractor was favorably impressed with the coated steel, which sustained no damage during shipping or deck construction. Among the data collected were resistivity and potential readings, initial chloride contents of the deck con
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Preliminary data on the use of the divided highway crossing sign indicated it to be effective in reducing wrong-way entries, and additional experimental installations were recommended.
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