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.
Federal and Virginia laws restrict the width of commercial vehicles traveling on interstate and federal-aid highways to 102 inches (8'6") without a special permit. Virginia regulations generally allow the issuance of special permits for loads up to 14 feet in width. Loads greater than 14 feet may be shipped only in exceptional circumstances. In add
...
The Virginia Department of Transportation is deeply committed to the development and implementation of an efficient, cost-effective maintenance management system for its bridges. Much effort is being applied towards the development of a management system that will ensure that appropriate maintenance takes place at the optimum times. Within such sys
...
The I-64 Hampton Roads Bridge-Tunnel spans the James River estuary and the lower Chesapeake Bay between the cities of Hampton and Norfolk. Two large wave-built spits, Willoughby Spit and Old Point Comfort, extend into the harbor beyond, the tunnels. This study examines the marine life inhabiting the Hampton Roads tunnel islands approximately 10 yea
...
A smart bridge is one that senses some significant condition of its environment or behavior and then automatically reacts to that condition. This report presents an overview of the subject, describing how emerging technologies are making it possible for bridges to be smart in a variety of ways. Special attention is paid to sensors, materials, and c
...
Virginia's first installation of epoxy-coated reinforcing steel, which was opened to traffic in 1977, was evaluated during construction and through 13 years of service. It was apparent at the time of construction that the integrity of the coating application did not meet the requirements of the specifications There were many flaws and holidays in t
...
In 1980, the Virginia Transportation Research Council developed a procedure to test silt fence installations (VTM-51). The test determines the filtering efficiency (amount of soil removed) and the flow rate of a geotextile. A known concentration and volume of sediment-laden water is timed as it passes through a geotextile sample. In 1988, ASTM Comm
...
Because of increased traffic loads and truck tire pressures over the last few years, the rutting of asphalt pavements has worsened. Additives such as polymers are being used in an attempt to improve the performance of these pavements. One such product is Novophalt, which is the registered trademark of an asphalt modified with 4 to 6 percent of a po
...
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
...
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
...
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
...
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
...
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
...
Links with this icon indicate that you are leaving a Bureau of Transportation
Statistics (BTS)/National Transportation Library (NTL)
Web-based service.
Thank you for visiting.
You are about to access a non-government link outside of
the U.S. Department of Transportation's National
Transportation Library.
Please note: While links to Web sites outside of DOT are
offered for your convenience, when you exit DOT Web sites,
Federal privacy policy and Section 508 of the Rehabilitation
Act (accessibility requirements) no longer apply. In
addition, DOT does not attest to the accuracy, relevance,
timeliness or completeness of information provided by linked
sites. Linking to a Web site does not constitute an
endorsement by DOT of the sponsors of the site or the
products presented on the site. For more information, please
view DOT's Web site linking policy.
To get back to the page you were previously viewing, click
your Cancel button.