Flexible linings provide a means of stabilizing roadside channels. Flexible linings are able to conform to changes in channel shape while maintaining the overall lining integrity. Permanent flexible lining such as riprap, gravel, or vegetation reinforced with synthetic mat are suitable for hydraulic conditions similar to those requiring rigid linin
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In order to improve the utility of HPMS, the Highway Performance Analysis Branch (HPN-21) has reviewed the HPMS data base and the Analytical Process. The purpose of this review was to determine the sensitivity of the HPMS Analytical Process to the input data and to the minimum tolerable conditions (MTC) used as threshold levels to identify deficien
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United States. Federal Highway Administration. Office of Highway Safety
1988-01-01
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This report is a continuation of the data series published annually since 1967 under the title, "Fatal and Injury Accident Rates on Federal-Aid and Other Highway Systems," until 1982 when it assumed its present title. It is the sixth report to Congress under Section 207 of the Surface Transportation Assistance Act of 1982. The report presents data
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This final report presents the findings, conclusions, and recommendations of the study conducted to develop a model to predict pedestrian volumes using small sampling schemes. This research produced four pedestrian volume prediction models (i.e., 1-, 2-, 3-, and 4-hour models) using 5-, 10-, 15-, and 30-minute volume counts. These volume count~ b~s
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This final report presents the findings, conclusions, and recommendations of the study conducted to model pedestrian/vehicle accidents. A group-type analysis approach for the prediction of pedestrian/vehicle accidents using pedestrian/vehicle conflicts and exposure measures is discussed in terms of statistical methodology, results of approach, and
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The objectives of this project were to assess the capabilities that are needed in a road profilometer and develop a design tailored to minimize life costs of the system. This led to the development of a system based on the IBM PC microcomputer. With the exception of a signal conditioning unit, the system is constructed from commercial components. T
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An extensive experimental program was conducted to evaluate the performance of both black and galvanized high strength bolts for bridges. Seventy two a325 black bolts, 145 hot dip galvanized a325 bolts, 85 mechanically galvanized a325 bolts, and 83 black a490 bolts from several different suppliers, were tested under direct and torqued tension in or
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This guide presents information for estimating the costs and safety benefits which would be expected due to various improvements on specific sections of rural, two-lane roads. Such improvements covered in this guide include lane widening, shoulder widening, shoulder surfacing, side slope flattening, and roadside improvements. This guide will be use
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United States. Department of Transportation. Federal Highway Administration. Office of Highway Information Management
1987-12-01
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In recent years, there has been a growing recognition of the need to assess the highway systems periodically with respect to extent and physical condition; the safety, efficiency, and economy of the systems in serving the movement of goods and people; and the impacts of existing national programs and policies. In addition, there is a need to assess
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Crash Testing Bridge Rails and Transitions; A Further Statistical Treatment of the Expanded Montana Asphalt Quality Study; Retroreflective Requirements for Traffic Signs—A Stop Sign Case Study; Modeling Traffic Flow
This report defines the parameters which are used to input the data required to run Program Barrier and BarrierX on a microcomputer such as an IBM PC or compatible. Directions for setting up and operating a working disk are presented. Examples of input, output and running time are presented.The input template adopted allows for considerable flexibi
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This is a manual written for those who direct or physically construct asphalt seal coats. The text is based on field experiences. The manual contains: the reasons for seal coating; each type of seal coat discussed as to the purposes of the seal and how it is constructed; and particular emphasis on chip seals and the factors which can affect obtaini
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Portable concrete barriers (PCB) keep traffic from entering work areas, protect workers, separate two-way traffic and protect construction such as falsework for bridges. The barrier connector is normally regarded as the weakest part of the barrier system. Recently, a number of chronic problems have been observed in the use of PCB, mainly related to
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United States. Federal Highway Administration. Office of Legislation and Strategic Planning
1987-11-01
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Because of the continuing demand for information concerning the financing of Federal-aid highways, the Federal Highway Administration prepared a report describing the basic process involved. This report, "Financing Federal-Aid Highways," was first published in January 1974 and was updated four times: "Financing Federal-Aid Highways -- An Amplificat
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