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.
In the last decade, there has been increasing national concern about the adequacy of underwater inspection of bridge substructures. A number of factors have contributed to this concern, in particular the collapse of several major spans, some of which led to loss of life. Substructure failures have been the cause of bridge collapses and the subject
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This report is an update of the report, The Geographic Distribution of HMOF and TTF Revenues and Allocations in Virginia From FY 88 through FY 92. As such, it describes the current structure of transportation finance in the Commonwealth. The financial structure is made up of estimated revenues and recommended allocations. Comparisons of the shares
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In 1968, Virginia passed the Habitual Offender Act (the Act), one of the first laws in the United States directed at motorists who repeatedly violate traffic laws. Persons adjudicated as habitual offenders are subject to long-term license revocation, and those who violate this revocation may be incarcerated. This study was conducted to determine th
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This study was undertaken to measure what, if any, differences exist in strength between mixtures made with 3/4-in (19-mm) maximum size aggregate and those made with 1/2-in (13-mm) maximum size aggregate. In order to make a comparison, a definition of equivalent gradation was necessary. This definition used a constant slope, n, of the log percent p
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This study evaluated concretes containing silica fume for use in overlays as a suitable alternative to the widely used latex-modified concrete (LMC). A two-lane, four-span bridge deck was overlaid with concrete containing silica fume at 7 percent or 10 percent by mass of the Portland cement as an additional cementitious material. The results of lab
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Chloride-induced corrosion causes significant deterioration in transportation structures where uncoated reinforcing steel is used. Concretes having a very low permeability are used to prevent the intrusion of chlorides into concrete to the level of the reinforcing steel. This study evaluates the strength and permeability of various combinations of
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In order to obtain the necessary detailed design guidelines for storm water best management practices (BMPs) included in the Virginia Department of Transportation's storm water manual, a field program was initiated in 1991 for testing the pollutant removal efficiency of selected practices. A dry detention pond with a small, highly impervious draina
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This paper describes the current structure of transportation finance in the Commonwealth. The financial structure is made up of estimated revenues and recommended allocations. We present comparisons of the shares of state and federal transportation revenues and allocations for each of the nine VDOT construction districts. The analysis includes all
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A growing percentage of all drivers are aged 55 and older. The findings of a number of safety studies have also fostered national interest in older driver issues. The needs and problems of Virginia drivers age 55 and older were identified in 10 focus group discussions and 100 in-depth telephone interviews. Respondents described a number of roadway
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Because of increasing difficulties in enforcing posted speed limits on the Capital Beltway around Washington, D.C., local officials proposed that experiments be conducted with photo-radar to determine if that method of automated speed enforcement (widely used in Europe for about 30 years and very recently employed in the western United States) coul
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This study was carried out in response to a request from the Virginia Manufactured Housing Association to be allowed by blanket permit to ship homes 14 feet wide at the base with roof eaves of up to 1 additional foot. In Virginia, the current maximum width allowed to be shipped under a blanket permit is 14 feet. This two-part study included (1) a s
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This report addresses the development of a program of succession planning for the Virginia Department of Transportation (VDOT). Transportation industry findings, confirmed by VDOT demographics, indicate a greater-than- average turnover among senior transportation professionals during the 1990s. This problem is accentuated by experience gaps, econom
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Section 153 of the Intermodal Surface Transportation Efficiency Act of 1991 (ISTEA) established an incentive grant program to support states in adopting and implementing laws requiring the use of safety belts and motorcycle helmets. Having such laws that applied to all front seat occupants of passenger cars and all motorcycle occupants qualified a
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The establishment and maintenance of public roads were among the most important functions of the county court during the colonial period in Virginia. Each road was opened and maintained by an overseer (or surveyor) of the highways, who was appointed each year by the Gentlemen Justices. The overseer was usually assigned all the able-bodied men (the
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Use of the 1986 AASHTO Design Guide requires accurate estimates of the resilient modulus of flexible pavement materials. Traditionally, these properties have been determined from either laboratory testing or by backcalculation from deflection data. Since Louisiana has chosen the backcalculation approach, there was a need to review the available com
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The Virginia Department of Transportation (VDOT) is committed to Virginia PROGRESS, which is a program for Intelligent Vehicle-Highway System (IVHS) research, development, and deployment. This document, VDOT's IVHS Strategic Plan, will guide the Department in Virginia PROGRESS. It is organized in the following chapters: (1) Strategic Assessment; (2
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Section 153 of the Intermodal Surface Transportation Efficiency Act of 1991 (ISTEA) established an incentive grant program to support states in adopting and implementing laws requiring the use of safety belts and motorcycle helmets. Having such laws that applied to all front seat occupants of passenger cars and all motorcycle occupants qualified a
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