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.
Rutting of heavy duty asphalt pavements has been increasingly experienced in recent years. This phenomenon is primarily resulting from high tire pressures and increased wheel loads. The design of Hot Mix Asphalt (HMA) which served reasonably well in the past needs to be reexamined to withstand the increased stresses. Various asphalt additives are b
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Oregon State Highway Division, Materials and Research Section
1990-01-01
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Preliminary finding by the National Center for Asphalt Paving Technology (NCAT) indicate that the rutting at three sites in Oregon was caused by the following: densification of the surface lift due to low initial compaction, moisture damage and/or densification of the lower lifts due to low initial compaction, and plastic flow in the lower lifts du
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This publication is a directory of motor carriers in North Dakota. The information was developed from the Interstate Commerce Commission and North Dakota Public Service Commission lists of certificated carriers. Firms were mailed a postcard during the spring of 1989 asking for some additional information about their firm, including types of authori
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The 1990 TRAFFIC ACCIDENT FACTS AND STATISTICS is a report published by the Center for Highway Safety of the Pennsylvania Department of Transportation. This publication is a statistical review· of motor vehicle traffic accidents in the Commonwealth of Pennsylvania for the calendar year 1990. The figures are compiled from the traffic accident report
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This paper examines the competitive contracting issues raised by the Economic Policy Institute (EPI) report, "The Emperor's New Clothes: Transit Privatization and Public Policy". The EPI report alleges that competitive contracting, or privatization, of public transit services results in higher costs, lower service levels, and is at odds with the ob
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This is "Part 2: Case Studies - Chapter 9" of the book, "The Japanese Experience in Technology", and includes the following subsections: Modernization and the railway; The transportation network; Issues in railway policy; Original design and production by imitation -The road to self-reliance; and, The role of foreign engineers. This book is a final
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This four page brochure explains what cabotage is and why it is important to nations. The last page provides a table summarizing the type of cabotage laws issued by the nations listed. Publication date not given; approximately 1990.
In an attempt to cope with the traffic congestion caused by the rapid growth of suburban populations and the relative decline in funds and space for additional freeway construction, the California Department of Transportation (CALTRANS) has introduced a number of High Occupancy Vehicle (HOV) Lanes designed to help the freeway network operate more e
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In 1989 and 1990, the General Accounting Office (GAO) reviewed Customs duties and other collections at three ports of entry, including the John F. Kennedy Airport (JKF). At that time, the GAO reported that a lack of internal controls over prenumbered collection documents and the number of unaccounted-for documents provided an enormous potential for
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At least six different median design combinations can be utilized to serve the traffic demands of suburban streets and highways. These range from raised to flush medians with or without left-turn bays, continuous left-turn lanes, or no left-turn geometric treatment. Virtually all of these are commonly used by the aggregate of geometric designers in
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This report provides the final details on Research Study 8-1.8-88-1141. the research was initiated to investigate the capability of using lasers for crack detection in pavements. If such a capability could be developed it would be used to aid in obtaining and evaluating pavement distress and cracking information for the State's pavement management
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The Oregon Department of Transportation (ODOT) is required to provide an annual measure of pavement condition based on International Roughness Index (IRI). The main coordination of this process with FHWA is done by the Highway Division's Planning Section. The data will be collected using a Mays Ride Meter (MRM). The Research Unit of the Materials a
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During its 1989 session, the Virginia General Assembly passed House Joint Resolution No. 419. The Resolution requested that Virginia's pedestrian safety laws be studied and that recommendations for revisions of those laws be made to improve pedestrian safety. Data concerning motor vehicle crashes involving pedestrians, for the period from 1986 thro
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The results of a study undertaken to evaluate premixed polymer concrete overlays (PMPCO) over a 3-year period are presented. The PMPCO evaluated were constructed with polyester amide para resin and silica sand 1;. polyester styrene resin 1 and silica sand 2; polyester styrene resin 2, basalt aggregate and coke breeze (for conductivity); polyester s
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This report describes the materials and construction details involved in the design and placement of four experimental mixes on I-95 (Richmond- Petersburg Turnpike) in 1985 and follows the performance for 48 months. The mixes were designed to resist rutting and to provide several years of service before failing from fatigue or the intrusion of wate
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The expert system presented should facilitate the in-depth analysis of bridge esthetics and encourage high standards for the appearance of bridges. The procedure described systematically evaluates features of a target bridge in relation to a similar comparator bridge, guided by a set of 177 rules established by experts. The rules, however, require
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The subject report describes a follow-up evaluation of test sections that were installed in 1982 and 1983 and reported on in 1987. Each test section contained three asphalt concretes: (1) with no additive, (2) with hydrated lime, and (3) with one or more chemical additives. The hydrated lime continues to deter stripping as well or better than the c
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Motor vehicle administrators have long realized that certain drivers present more of safety problem than others. Tests of static visual acuity, knowledge of the rules of the road, and on-the-road driving performance are used to ensure that each driver displays a specified level of competence before being licensed to drive. However, experience has s
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