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 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 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 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 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 Traffic Barrier Performance Related to Passenger Car Characteristics written by James E. Bryden and published by . This book was released on 1987 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Concepts for Improved Traffic Barrier Systems written by and published by . This book was released on 1971 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 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 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 Guardrail Performance and Design and Concepts for Improved Traffic Barrier Systems written by Maurice E. Bronstad and published by . This book was released on 197? with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 1992 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book SERB a New High Performance Self restoring Traffic Barrier written by Maurice E. Bronstad and published by . This book was released on 1981 with total page 0 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 Roadside Design Guide written by American Association of State Highway and Transportation Officials. Task Force for Roadside Safety and published by . This book was released on 1989 with total page 560 pages. Available in PDF, EPUB and Kindle. Book excerpt:
