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 state of Virginia has a unilateral traffic records system whereby localities are compelled by law to provide law enforcement information to the state without any assurance that usable information will be returned to the localities. This situation has forced localities to develop and maintain their own traffic records systems to satisfy state re
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Permanent forms for bridge decks have become increasingly more attractive to the construction industry in recent years. Many highway officials however, have reservations concerning the use of permanent steel forms. These reservations are related to the effect the forms might have on the durability of the concrete decks and to the possibility of fut
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New pavement marking materials and systems are continuously being introduced with claims of improvements in durability and reflectivity, as well as cost advantages. Because of the potential for savings through the use of a new system of pavement striping utilizing traffic paint and a sand/bead mixture, research was undertaken to compare the system
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The purpose of this study was to evaluate the new skid trailer obtained by the Virginia Department of Highways & Transportation and to determine how the survey skid testing program should be conducted in light of the findings. Specifically, those things considered about the new trailer were: (1) testing precision; (2) operational error, defined as
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Studies of efforts in Virginia to reduce the incidence of reflection cracking when portland cement concrete pavements or bases are overlayed with asphaltic concrete are reported. The methods of reflection crack reduction discussed are: (1) The use of sand as a bond breaker between portland cement concrete pavements and asphaltic overlays, (2) the u
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This is the first in a series of reports documenting the Virginia Department of Highways & Transportation line source model for predicting carbon monoxide concentrations within the microscale environments of highways. The purpose of this first report is to provide a detailed introduction to and verification of the theoretical development of AIRPOL-
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This is the third in the series of AIRPOL reports. It details the mechanics and thought processes necessary for proper implementation of the computer program, AIRPOL-4. Furthermore, it recommends several guidelines for the preparation and generation of air quality analyses. The next report in this series will detail the computational method and alg
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The Department of Highways & Transportation needs an economical and efficient air quality sampling system for meeting requirements on air monitoring for proposed projects located In critical areas. Two sequential air sampling systems, the ERAI and the EMI, that appeared to be the answer to this need were evaluated. On the basis of analytical reliab
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Forty-five attenuation spectra for earplugs were classified according to a simplified method designed to produce single-number ratings of noise reduction. The rating procedure was applied to the mean attenuation scores, to mean-minus-one-standard-deviation scores, and to mean-minus-two-standard-deviations scores. The reporting of all three numbers
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Development of criteria for altering existing full cloverleaf interchanges to improve the traffic operations and safety of this particular configuration. Only the standard cloverleaf configuration with a loop ramp and an outer connection in each quadrant was considered in this study. The data based form the Interstate System Accident Research-Study
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