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 increasing importance of improving the efficiency of transportation facilities has resulted in a need for a systematic economic model to evaluate High Occupancy Vehicle (HOV) projects. These projects encourage higher vehicle occupancy rates by restricting the use of some portion of the facility to some vehicle types or minimum number of occupan
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In this report, a method is developed for determining the equivalent thicknesses for different base courses, which will give the same pavement life expectancy. This study shows how the layer equivalents can be obtained from Texas Triaxial tests or from pavement pressuremeter tests or from Dynaflect tests. The procedures were developed after testing
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This document is a supplement to Research Report 284-3, "Layer Equivalency Factors and Deformation Characteristics of Flexible Pavements." It contains the collection of graphs of the pressuremeter test and the corresponding regression curves for the hyperbolic stress-strain model performed during the course of the study reported in Research Report
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The objective of the project was to place a CERL/Kelly-Vail testing unit and a microwave oven in the field to perform tests of plastic concrete on construction projects.The CERL/K-V tests were to determine water and cement content of the concrete and were evaluated as a method of predicting 28-day concrete strength.Although the water and cement con
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This interim report is to report on the status and performance to date of an experimental bridge deck overlay of polymer concrete consisting of 4 courses of polyester-styrene resin monomer and sand aggregate. The primary purpose of such an overlay is to bar against moisture penetrating into the top surface of the concrete and perpetuating corrosion
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This study was initiated to investigate the overall performance of preformed pavement marking tapes with respect to their appearance, durability, and night visibility, and to recommend criteria for the selection of such materials based on their performance. The durability of each material varied with the location and pavement type. Compared with th
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Recent research has led to the development of durable modified-sulphur mortars, concretes, and coatings. All of the methods of using sulphur as a binder for rigid concrete rely on the reaction of one or more modifiers to stabilize, in the hardened state, at least a portion of the sulphur in its less brittle, less dense form. The durability of the c
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This report summarizes the work performed on the subject study from June through September 1982. In accordance with the revised work plan for Task 4 of the project approved May 24, 1982, the new completion date for the project is April 30, 1983.
This study examined the operational characteristics of the four-mile section of Route 8 between Routes 57 and 58. It was noted that these characteristics were significantly improved after provision of the experimental passing zones. Average and 85th percentile speeds both increased significantly, indicating an improved traffic flow and level of ser
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Data from 206 reports of 377 flight attendant injuries occurring from 1971 through 1976 are summarized. These data were obtained from the Cabin Safety Data Bank of the Civil Aeromedical Institute, and are based on Federal Aviation Administration and National Transportation Safety Board accident/incident reports. Information relating to the severity
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Rail costs have been estimated under two separate assumptions. The first involves the development of revenue-cost ratios for the through movement of grain and grain products from country origin to final destination; the second, the development of revenue-cost ratios for the outbound portion of the movement only.
This verified statement will address the subject of off-branch costs. The principal concern is with the calculation and application of the cost update ratio and the development of car ownership and locomotive depreciation expenses.
The results in this report were obtained during the test program which began in 1973. Physical properties of various polymer concretes are listed. They include compressive strength, splitting tensile strength, bond strength, the modulus of elasticity, shrinkage and thermal coefficients. A description is also presented of three polymer concrete over
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Repeated load diametral test systems are experiencing increased use to determine resilient properties of asphalt concrete and admixture stabilized materials; they have not been used extensively to determine the resilient properties of unbound materials. This is due in part to the fact that comparative studies between the properties obtained with th
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Construction and short-term pavement performance problems were noted in the Pacific Northwest and throughout the United States during the past five years. Several reasons have been suggested to explain this sudden change in pavement performance, such as recent variabilities in asphalt properties and new developments in paving technology.Using the d
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