A major national field and analytical study has been contucted into the effect of various design features on the performance of jointed concrete pavements. Extensive design, construction, traffic, and performance data were obtained from numerous experimental and other concrete pavement sections throughout the country. Field data collected and analy
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This guide provides guidance for the design of horizontal curves on new highway sections and for the reconstruction and upgrading of existing curves on two-lane rural roads. Information is also provided in this guide for computing the expected benefits and costs for a variety of curve improvements, such as curve flattening, roadway widening, provid
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The objective of this study was to develop an integrated survey vehicle for measuring pavement surface conditions at highway speeds. This was accomplished by determining the requirements and operating characteristics for such a system, preparing a design, and estimating initial and operating costs. This volume contains a review of the data and meas
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This report describes a study of the delineation requirements for work zone traffic control. The research included a comprehensive review of past studies and current practices, and an examination of current standards. It was concluded that, in spite of the increasing number of different types of channelizing devices, there appears to be no scientif
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The Federal Highway Administration (FHWA) has begun a number of initiatives to improve signing on the Nation's roadways. These include workshops to obtain input from experts across the country, a review of each State's highway sign replacement and refurbishing program, and a training course. This report documents the proceedings of the workshops, o
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Edgeline Widths and Traffic Accidents; Model Study of the Hatchie River U.S. 51 Bridge; Field Evaluations of Breakaway Utility Poles; Effectiveness of Calcium Nitrite Admixture as a Corrosion Inhibitor
United States. Federal Highway Administration. Office of Highway Safety
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1990-06-01
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This report presents data which can be used in the evaluation of the highway safety performance of the States. The data were submitted by the States through the Highway Performance Monitoring System operated by the Federal Highway Administration. The traffic accident statistics for 1988 show an increase of about 700 fatalities over 1987. A dispropo
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A series of crash tests were conducted to evaluate aesthetic guardrails, guardwalls, median barriers and bridge rails that have been designed for use on park roads, parkways and other federal lands roads. Following two iterations of redesign, a steel-backed wooden guardrail showed acceptable performance when tested and evaluated in accordance with
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This document presents aggregate statistics contained in the 1987 Motor Carriers of Property Accident Database. The database was compiled from reports of applicable accidents filed by commercial carriers of property subject to the Department of Transportation Act (49 U.S.C. 1651 - 60). The database is maintained by the Office of Motor Carriers (OMC
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In section 159 of the Surface Transportation and Uniform Relocation Assistance Act of 1987, Congress required the Secretary of Transportation to conduct a study of national highway-railroad improvement and maintenance needs. Nine specific issues were to be addressed. One of these (#4) was: "An examination of driver behavior at such crossings and wh
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The objective of this study was to investigate the effects of performing the supplemental procedure of AASHTO T 209 (or ASTM D 2041) on the percent air voids, the effective aggregate specific gravity, and the maximum specific gravity of a bituminous paving mixture, using both thoroughly coated aggregates and partially coated aggregates. The supplem
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This report documents the design, development and validation of an upgraded pendulum for the Federal Outdoor Impact Laboratory (FOIL). The pendulum, which is designed to simulate the low-speed impact of a small automobile into breakaway luminaire and sign supports, has been upgraded with an 1800-lb (817 kg) mass, a new crushable nose design, specia
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A major field study and evaluation has been conducted into the effectiveness of three structural overlay types for portland cement concrete (PCC) pavements. These include sawing and sealing asphalt concrete (AC) overlays of PCC pavements, cracking and seating PCC pavements prior to AC overlay, and constructing a thin bonded PCC overlay on top of th
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A major field study and evaluation has been conducted into the effectiveness of three structural overlay types for Portland cement concrete (PCC) pavements. These include sawing and sealing asphalt concrete (AC) overlays of PCC pavements, cracking and seating PCC pavements prior to AC overlay, and constructing a thin bonded PCC overlay on top of th
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A major field study and evaluation has been conducted into the effectiveness of three structural overlay types for portland cement concrete (PCC) pavements. These include sawing and sealing asphalt concrete (AC) overlays of PCC pavements, cracking and seating PCC pavement prior to AC overlay, and constructing a thin bonded PCC overlay on top of the
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A major field study and evaluation has been conducted into the effectiveness of three structural overlay types for portland cement concrete (PCC) pavements. These include sawing and sealing asphalt concrete (AC) overlays of PCC pavements, cracking and seating PCC pavements prior to AC overlay, and constructing a thin bonded PCC overlay on top of th
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The actual moisture susceptibility of 10 bituminous mixtures placed in the field was compared to the moisture susceptibility that was predicted during the laboratory evaluation of the same mix design. Laboratory mixtures were evaluated using the modified Lottman procedure and the Root-Tunnicliff procedure, in addition to routine moisture susceptibi
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The transition behavior of bridge steels and weldments largely determines the ir toughness underservice loading rates and temperatures. Two aspects of the transition were investigated in thisproject: The first was to develop a better understanding of the micro-mechanics of fracture ofbridge steels and welds. This study showed that the AASHTO yield
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