The purpose of this research was to test the validity of using automatically-collected traffic volumes from selected system detector sites to generate a full TRANSYT-7F data file for calculating signal network timing plans. Termed the 1.5 GC control concept, this approach assumes that volume shifts on selected links will accurately represent shifts
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The purpose of this research was to test the validity of using automatically-collected traffic volumes from selected system detector sites to generate a full TRANSYT-7F data file for calculating signal network timing plans. Termed the 1.5 GC control concept, this approach assumes that volume shifts on selected links will accurately represent shifts
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This report documents the methodology, developments, and findings of the two-year study. Among the significant results of this project are: (1) a new set of crossing signal visibility specifications based on widely accepted definitions of motorists' requirements and a demonstration that currently available signals exceed these specifications when p
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The objective of this study was to develop a low solvent, stockpilable, bituminous pavement patching material. Foamed asphalt and aromatic oil with emulsified asphalt were studied as binders with virgin aggregates. Although low solvent, these were found to have unsatisfactory stockpile characteristics. Foamed asphalt and rejuvenating agents were st
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This study was intended to quantify the benefits and costs resulting from lane widening, shoulder widening, shoulder surfacing, sideslope flattening, and roadside improvements.
This report documents the "Highway Safety Analysis Monitoring" (HISAM) computer program. The first half of the report contains information to the user on how to install, start up, and operate all of the program functions. It also describes the structure, functional design and capabilities of the program. The second half of the report is directed to
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This report summarizes the results of a study to assess the needs of transportation agencies for computer software to aid in the analysis of accident data. Two computer programs were developed to meet the identified needs of local (city, county, regional) transportation agencies, The programs will operate on microcomputers and are user friendly, th
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Findings from a six-year field and laboratory program of frost-action research in four principal areas are summarized. Research on the first topic, frost-susceptibility index tests, led to selection of the Corps of Engineers' frost design soil classification system as a useful method at the simplest level of testing. At a much more complex level, a
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Road maintenance is characterized as the continuing care of the roadway and providing for its intended use until such time as needed improvements are identified and undertaken. Within the scope of recurrent and deferred maintenance activities, opportunities are identified to improve cost effectiveness of surfacing and ditch maintenance and reduce f
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The Nationally Coordinated Program (NCP) of Highway Research, Development, and Technology; Tire-Pavement Interaction; Correlation Study—Subjective Versus Instrumental Evaluation of Pavement marking Retroreflection
This manual is a guide to the seismic design of bridges. It presents the basic principles of seismology, structural dynamics and structural form as they relate to highway bridge structures. Seismic design concepts are presented which highlight the importance of simplicity, symmetry and integrity for bridges. Examples of acceptable structural form a
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United States. Federal Highway Administration. Office of Highway Safety
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1987-05-01
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The report contains an extension of a series of statistical data published annually since 1967 by the Federal Highway Administration (FHWA) as Fatal and Injury Accident Rates on Federal-Aid and Other Highway Systems. The series has been a cooperative effort of the FHWA's Offices of Traffic Operations, Highway Safety, and Highway Planning, The State
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This manual provides analysis approaches to be used with the FHWA Culvert Analysis Microcomputer Program HY8. HY8 is a BASIC program written for the IBM-PC with MS-DOS. Culvert analysis approaches are demonstrated with examples that provides instruction in data entry, file modification and culvert performance analysis. The examples illustrate the d
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Selected data on highway toll facilities in the United States are contained in Table T-1 ofthis report based on a survey of facilities in operation, financed, or under construction asof January 1, 1987. The data includes information such as the name, financing or operating authority, location and termini, feature crossed, length, and road system fo
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United States. Federal Highway Administration. Demonstration Projects Division
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1987-04-01
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PDF
The objectives of this review were to obtain a better understanding of the expected performance of C&S and overlaying, and to identify the conditions under which this technique has been used in a cost-effective manner. It is hoped that the information obtained from the review will aid states in determining when and how to use C&S as an effective re
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The objective of this project was to determine the critical rail mounting heights to prevent underride and override for traffic barriers. W-beam guardrails, which are the most commonly specified barrier in the U. S., were used to develop criteria for both this element and the thrie beam. The scope of the project included both computer simulation an
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A three-year corrosion research project on 11 corrosion protection systems was undertaken in two laboratory studies. A total of 124 reinforced concrete slabs were subjected to a 48-week cyclic wet and dry saltwater exposure in the first study. The second year-long study dealt with cyclic saltwater exposure on 19 full-size sections of reinforced con
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