Download or read book In service Performance of Traffic Barriers written by Malcolm H. Ray and published by Transportation Research Board. This book was released on 2003 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This is a report on a research agenda to better inform future societal decisions on ocean CDR [carbon dioxide removal]; the Committee is not advocating either for or against possible future ocean CDR deployments, and the Committee recognizes that ocean CDR would, at best, complement the role of climate mitigation approaches including decarbonization"--Page viii.
Download or read book In service Performance of Traffic Barriers written by and published by . This book was released on 2003 with total page 119 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Traffic Barrier Performance written by J. G. Fred Hiss and published by . This book was released on 1992 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report summarizes research on traffic barrier performance conducted by New York from 1983 through 1987, which concentrated on 1) development of height standards and tolerances for light-post barriers, 2) barrier performance related to vehicle characteristics, 3) development of an economic model to compare median barrier costs, and 4) effects of curbs on barrier performance. Accident data were obtained for approximately 3300 accidents occurring between July 1, 1982 and June 30, 1983. Of these, about 1700 were at light-post barrier sites.
Download or read book In service Performance of Highway Barriers written by John Van Zweden and published by . This book was released on 1977 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Performance Assessment of Road Barriers in Indiana written by Yaotian Zou and published by . This book was released on 2016-12-31 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Road barriers have been used as an effective countermeasure to prevent exposure of errant vehicles to both vehicles travelling in the opposite direction and to roadside hazards. The objective of this study was to evaluate the in-service safety performance of three types of road barriers (concrete barriers, steel W-beam guardrails, and high-tension cable barriers) in Indiana using cross-sectional analysis based on crash data. The quantitative evaluation was comprised of three components: 1) the effect of the road, barrier scenarios, and traffic on the barrier-relevant (BR) crash frequency, 2) the effect of the road and the barrier scenarios on the BR harmful events, and 3) the effect of the BR events and other conditions on the injury outcomes.The introduction of the BR harmful events linked the crash onset with its outcome. The three developed statistical models were connected through their inputs-outputs and followed the sequence of various BR events during the BR crash. This improvement allowed a more comprehensive and insightful analysis of the barriers' safety effects and a more efficient use of data. The injury outcomes were estimated for all the individuals in a crash rather than for the most severe outcome of a crash. Further improvement of the cost estimates was accomplished by utilizing hospital data.For median barriers, this study found that the total number of BR crashes was higher with the use of median barriers, mostly due to the introduction of collisions with barriers and an increase in the collisions after redirecting vehicles back to traffic. These undesirable effects of barriers were surpassed by the positive results of reducing hazardous events such as cross-median crashes, rollover events, and collisions with roadside hazards, which substantially reduced the number of severe injuries and fatalities.
Download or read book Performance of Longitudinal Traffic Barriers written by Maurice E. Bronstad and published by Transportation Research Board National Research. This book was released on 1987 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book In service Performance of Highway Barriers Final Report written by J. Van Zweden and published by . This book was released on 1977 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Performance of Temporary Concrete Traffic Barriers During the Widening of I 95 written by Frank N. Lisle and published by . This book was released on 1982 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: This research effort was initiated at the request of officials of the Virginia Department of Highways and Transportation to obtain information on the performance of the precast concrete traffic barrier (PCTB) when exposed to heavy vehicles. The PCTB is a portable system used in Virginia since 1976 to separate high speed vehicular traffic and construction activities. The PCTB system was evaluated during the widening of I-95 at Ashland. The scope of the evaluation included (1) an examination of the traffic accident data for I-95 before and during construction to determine the effects of construction on the frequency and characteristics of traffic accidents, (2) an analysis of tire marks on the barrier and barrier-involved accidents to obtain an indication of the effectiveness of the PCTB in safely redirecting vehicles, and (3) an examination of the effects of the PCTB system on traffic operations. The research effort found that (1) the traffic accident rate in the construction zone on I-95 was 12% higher than before construction, (2) the reduction in the lateral distance between the vehicles in the median and shoulder lanes during construction appeared to contribute to an increase in the number of sideswipe type accidents, (3) 97% of the vehicles which impacted the barrier were safely redirected, (4) drivers were more at ease with the barrier located on the left edge of the roadway than when located on the right, and (5) vehicular speeds were reduced by only a few miles per hour when the barriers were in place. A subsequent study utilizing mathematical computer modeling techniques is recommended, since the performance of the PCTB system when impacted by a heavy vehicle was not identified in this study.
Download or read book Performance of Longitudinal Traffic Barriers written by and published by . This book was released on 1987 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluation of the Performance of Portable Precast Concrete Traffic Barriers written by Frank N. Lisle and published by . This book was released on 1978 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: The portable precast concrete traffic barrier is used to separate high speed vehicular traffic and construction activities. However, since there was a lack of information on the barrier's performance in a construction zone environment, officials of the Virginia Department of Highways and Transportation requested that the Virginia Highway and Transportation Research Council evaluate the performance of the barrier during the widening of the Virginia Beach-Norfolk Expressway (Rte. 44). The scope of the evaluation included (1) a review of the literature on the performance of the concrete "safety shape" barriers, (2) an examination of the accident data before and during construction on Rte. 44 to determine the effects of construction on the frequency and characteristics of traffic accidents, (3) an analysis of tire marks and barrier-involved accidents to determine the effectiveness of the barriers in safely redirecting vehicles, and (4) an examination of the effects of construction on traffic characteristics. The literature review revealed that in using the precast concrete traffic barrier the following factors should be considered: (1) the end of the barrier should never be exposed to oncoming traffic; (2) the barrier joints must be tight for the barriers to act as a system; (3) the longitudinal axis of the barriers should be placed parallel to the roadway, except when the barrier system is started with a flare; (4) the barrier system should have a minimum length of 100 feet (30 m); and (5) the barrier system must have lateral support in order to prevent vehicle penetration. For conditions on Rte. 44, it was found that (1) there was an average of 49 vehicle contacts with the barrier for every reported accident in which the barrier was involved; (2) there was a definite tendency for motorists to stay out of the barrier lane, but avoidance of the barrier lane was reduced as volume increased; and (3) with a 55 mph (88 km/h) posted speed limit, the vehicular speeds were reduced by only a few miles per hour when the barriers were in place. Evaluation of the barrier's performance during the widening of I-95 is recommended, since that highway carries a much higher volume of tractor-trailers than does Rte. 44.
Download or read book In service Evaluations of Experimental Traffic Barriers written by Cecilio A. Leonin and published by . This book was released on 1986 with total page 59 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The 1977 'AASHTO Guide for Selecting, Locating, and Designing Traffic Barriers' defines an experimental barrier as one 'that has performed successfully in full-scale crash tests and promises satisfactory in-service performance.' This report summarizes available information on several experimental barrier systems that have been recently installed throughout the country. Included are cost, construction, and performance data on the following experimental barriers: self-restoring barrier (SERB) guardrail; service level 1 (SL1) bridge rail; Connecticut impact attenuation system (CAIS); SENTRE guardrail terminal; Colorado type 3F median barrier end treatment; two high-performance truck barriers (Idaho and Pennsylvania); IBC sand-filled median barrier; modified thrie beam guardrail"--Technical report documentation page.
Download or read book Pilot In service Performance Evaluation of Cable Barrier in Washington State written by Paul Abbott (Of the Washington State Department of Transportation) and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A pilot routine in-service performance evaluation (ISPE) was undertaken for cable barrier following the process outlined in NCHRP 22-33. Barrier breach, rollover, vehicle mix, and secondary impacts on the roadside and roadway were evaluated as performance measures using data sourced from the Crash Location & Analysis System (CLAS) database and the WSDOT Engineering Crash Data Mart for years 2016 through 2020. Four Performance Assessment Levels, ranging from no exclusions of crash data to exclusions of crash data limited to vehicle type and speed limit were assessed. For all five performance measures, the study found no measurable difference between the performance of the four major types of cable barrier in use on state highways within WSDOT jurisdiction, including three-strand versus fourstrand.
Download or read book Safety Effectiveness Evaluation of Traffic Barrier Systems written by United States. National Transportation Safety Board and published by . This book was released on 1980 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: Traffic barriers are roadside hardware of various designs and materials which are intended to protect vehicles from such off-the-road hazards as trees, embankments, ravines, signposts, bridge support pillars or abutments, or other hazards. The National Transportation Safety Board (NTSB) has been concerned with the problem of inadequate traffic barriers for several years. The Safety Board has investigated accidents in which barriers failed, and has made recommendations to the FHWA. Of primary importance among these have been recommendations that the FHWA develop and promulgate mandatory performance standards for traffic barriers. The purpose of such standards would be to require that traffic barrier types be crash-tested to demonstrate their ability to meet a set of established safety criteria. At present, barriers are not required to meet such criteria through crash-testing. The purpose of this report is to review past Safety Board concerns regarding the adequacy of bridge and highway rail systems and to evaluate the FHWA's efforts to develop safer traffic barriers. This study analyzes the results of recent crash-testing sponsored by the FHWA and makes recommendations concerning performance standards for traffic barriers.
Download or read book Performance Evaluation of Selected Traffic Barrier End Treatments written by Michael T. Stanley and published by . This book was released on 1993 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Location Selection and Maintenance of Highway Traffic Barriers written by Jarvis Dale Michie and published by . This book was released on 1971 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: Judicious application of current state-of-the-art information on traffic barriers should result in safer highways. traffic barriers, as defined herein, consist of (1) longitudinal systems, such as guardrails, median barriers, and bridge rails; and (2) crash cushion systems, such as a nest of steel drums. The report is directed primarily for use by highway designers as a guide and by maintenance groups as an aid in upgrading existing installations. Traffic barrier systems evaluated by full-scale crash tests and satisfactory service performance are presented, together with a selection procedure.
Download or read book Traffic Barrier Performance Related to Vehicle Size and Type written by James E. Bryden and published by . This book was released on 1986* with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Roadside Design Guide written by American Association of State Highway and Transportation Officials. Task Force for Roadside Safety and published by AASHTO. This book was released on 2011 with total page 345 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The Roadside Design Guide presents a synthesis of current information and operating practices related to roadside safety and is written in dual units-metric and U.S. Customary. This book is a guide. It is not a standard, nor is it a design policy. It is intended to use as a resource document from which individual highway agencies can develop standards and policies. Although much of the material in the guide can be considered universal in its application, several recommendations are subjective in nature and may need modification to fit local conditions. However, it is important that significant deviations from the guide be based on operational experience and objective analysis. The 2011 edition of the AASHTO Roadside Design Guide has been updated to include hardware that has met the evaluation criteria contained in the National Cooperative Highway Research Program (NCHRP) Report 350: Recommended Procedures for the Safety Performance Evaluation of Highway Features and begins to detail the most current evaluation criteria contained under the Manual for Assessing Safety Hardware, 2009 (MASH). For the most part, roadside hardware tested and accepted under older guidelines that are no longer applicable has not been excluded in this edition." -- AASHTO website.
