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Author : Andrew W. Ooms
Publisher :
ISBN 13 :
Total Pages : 188 pages
Book Rating : 4.:/5 (891 download)
Download or read book A Predictive Median Barrier Warrant to Reduce Cross-median Crashes written by Andrew W. Ooms and published by . This book was released on 2010 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Douglas W. Harwood
Publisher :
ISBN 13 :
Total Pages : 100 pages
Book Rating : 4.E/5 ( download)
Download or read book Factors Contributing to Median Encroachments and Cross-median Crashes written by Douglas W. Harwood and published by . This book was released on 2014 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: "TRB's National Cooperative Highway Research Program (NCHRP) Report 790: Factors Contributing to Median Encroachments and Cross-Median Crashes investigates the factors that contribute to median-related crashes and identifies design treatments and countermeasures that can be applied to improve median safety on divided highways."--Publisher description.
Author : Hampton Clay Gabler
Publisher :
ISBN 13 :
Total Pages : 192 pages
Book Rating : 4.:/5 (1 download)
Download or read book Evaluation of Cross Median Crashes written by Hampton Clay Gabler and published by . This book was released on 2005 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 110 pages
Book Rating : 4.:/5 (5 download)
Download or read book Median Barrier Study Warrant Review, 1997 written by and published by . This book was released on 1997 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Raghavan Srinivasan
Publisher :
ISBN 13 :
Total Pages : 62 pages
Book Rating : 4.:/5 (1 download)
Download or read book Safety Evaluation of Cable Median Barriers in Combination with Rumble Strips on Divided Roads written by Raghavan Srinivasan and published by . This book was released on 2017 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Development of Crash Modification Factors program conducted the safety evaluation of cable median barriers in combination with rumble strips on the inside shoulder of divided roads for the Evaluation of Low Cost Safety Improvements Pooled Fund Study. This study evaluated safety effectiveness of cable median barriers in combination with rumble strips on the inside shoulders of divided roads. This strategy is intended to reduce the frequency of cross-median crashes, which tend to be very severe. Geometric, traffic, and crash data were obtained for divided roads in Illinois, Kentucky, and Missouri. To account for potential selection bias and regression-to-the-mean, an empirical Bayes before-after analysis was conducted using reference groups of untreated roads with characteristics similar to those of the treated sites. The analysis also controlled for changes in traffic volumes over time and time trends in crash counts unrelated to the treatment. In Illinois and Kentucky, cable median barriers were introduced many years after the inside shoulder rumble strips were installed; therefore, the evaluation determined the safety effect of implementing cable barriers along sections that already had rumble strips. Conversely, in Missouri, the inside shoulder rumble strips and cable barrier were implemented around the same time. Hence, the evaluation in Missouri determined the combined safety effect of inside shoulder rumble strips and cable barriers. The combined Illinois and Kentucky results indicate about a 27-percent increase in total crashes; a 24-percent decrease in fatal, incapacitating injury crashes; and a 48-percent decrease in head-on plus opposite-direction sideswipe crashes (used as a proxy for cross-median indicator plus head-on). the economic analysis for benefit-cost ratios shows that this strategy is cost beneficial.
Author : Dean Sicking
Publisher :
ISBN 13 :
Total Pages : 37 pages
Book Rating : 4.:/5 (34 download)
Download or read book Cable Median Barrier Guidelines written by Dean Sicking and published by . This book was released on 2008 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Organisation for Economic Co-operation and Development
Publisher :
ISBN 13 :
Total Pages : 60 pages
Book Rating : 4.3/5 (511 download)
Download or read book Highway Safety Research Organizations and Resources in the United States written by Organisation for Economic Co-operation and Development and published by . This book was released on 1966 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : University of Minnesota. Intelligent Transportation Systems Institute
Publisher :
ISBN 13 :
Total Pages : 64 pages
Book Rating : 4.3/5 (555 download)
Download or read book Annual Report written by University of Minnesota. Intelligent Transportation Systems Institute and published by . This book was released on 2004 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Malcolm H. Ray
Publisher :
ISBN 13 :
Total Pages : 172 pages
Book Rating : 4.3/5 (555 download)
Download or read book Guardrail and Median Barrier Crashworthiness written by Malcolm H. Ray and published by . This book was released on 1997 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: This synthesis will be of interest to state department of transportation (DOT) roadway design, traffic, structural, maintenance, and research engineers and others concerned with highway safety issues. This synthesis describes the current state of the practice for the use of guardrails and median barriers and their crashworthiness. It includes information about the crashworthiness and typical applications of the most common, permanently installed, nonproprietary guardrail and median barrier systems used in the United States today. A significant amount of detail is included in the text to aid the design, selection, and locating processes for safe and effective guardrails and median barriers. The report presents data obtained from a review of the literature and a survey of state DOTs. The synthesis presents a description of the typical longitudinal barriers in use today, including drawings, the extent of their use, and the most recent testing on each guardrail and barrier system, with particular emphasis on NCHRP Report 230 and 350 requirements. In addition, it discusses the maintenance issues, cost constraints, and common problems with each type of barrier. The synthesis only discusses the crashworthiness of guardrails and median barriers; their transitions and terminals are not discussed.
Author : Gary A. Davis
Publisher :
ISBN 13 :
Total Pages : 63 pages
Book Rating : 4.:/5 (294 download)
Download or read book Cross Median Crashes written by Gary A. Davis and published by . This book was released on 2008 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt: The goals of this project were to first review the state-of-art with regard to identifying highway sections where median barriers would be most effective in preventing median-crossing crashes (MCC), and if necessary, develop remedies for any identified deficiencies. A statistical technique was developed for estimating the frequency and rate of MCCs on each of a set of highway sections, which required the analyst to review only a subset of hard-copy accident reports. This technique was applied to Minnesota's freeways and rural expressways, and highway sections were ranked with respect to estimated frequency of MCCs. A first version of a simulation model was developed for comparing the cost-effectiveness of barrier projects on different highway sections. The model uses Monte Carlo simulation to estimate the probability that an encroaching vehicle crosses a median with a specific cross-section, and collides with another vehicle traveling in the opposite direction. The model is implemented as a pair of linked Excel spreadsheets, with a companion macro written in Visual Basic for Applications.
Author : Olugbenga Erinle
Publisher :
ISBN 13 :
Total Pages : 96 pages
Book Rating : 4.3/5 (91 download)
Download or read book An Analysis of Guardrail and Median Barrier Accidents Using the Longitudinal Barrier Special Studies (LBSS) File. Volume I: Final Report written by Olugbenga Erinle and published by . This book was released on 1994 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Md Rubiat Ferdous
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (747 download)
Download or read book Placement of Traffic Barriers on Roadside and Median Slopes written by Md Rubiat Ferdous and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Cross median crashes have become a serious problem in recent years. Most of the median cross sections used for divided highways have terrains with steep slopes. Traffic barriers, frequently used on slopes, are generally designed based on the findings obtained from crash tests performed on flat terrain. For barriers placed on roadside and median slopes, vehicle impact height varies depending on the trajectory of the vehicle along the ditch section and lateral offset of the barrier. Thus depending on the placement location on a relatively steep slope, a barrier can be impacted by an errant vehicle at height and orientation more critical compared to those considered during its design. Hence, detailed study of performance of barriers on roadside and median slopes is needed to achieve acceptable safety performance. In this study, performances of modified G4(1S) W-beam, Midwest Guardrail System (MGS), modified Thrie-beam, modified weak post W-beam, and box-beam guardrail systems on sloped terrains are investigated using numerical simulations. A procedure is developed that provide guidance for their placement on roadside and median slopes. The research approach consists of nonlinear finite element analyses and multi-rigid-body dynamic analyses approach. Detailed finite element representation for each of the barriers is developed using LS-DYNA. Model fidelity is assessed through comparison of simulated and measured responses reported in full scale crash test studies conducted on flat terrain. LS-DYNA simulations of vehicle impacts on barriers placed on flat terrain at different impact heights are performed to identify performance limits of the barriers in terms of acceptable vehicle impact heights. The performances of the barriers are evaluated following the guidelines provided in NCHRP Report 350. Multi-rigid-body dynamic analysis code, CARSIM, is used to identify trajectories of the vehicles traversing various roadside and median cross-slopes. After analyzing vehicle trajectories and barrier performance limits, a guideline has been prepared with recommendations for the placement of barriers along roadside and median slopes. This guideline is then verified and refined using the responses obtained from full-scale LS-DYNA simulations. These simulations capture the full encroachment event from departure of the vehicle off the traveled way through impact with the barrier.
Author : Michael G. McNally
Publisher :
ISBN 13 :
Total Pages : 96 pages
Book Rating : 4.0/5 ( download)
Download or read book The Impact of Jersey Median Barriers on the Frequency and Severity of Freeway Accidents written by Michael G. McNally and published by . This book was released on 1991 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : American Association of State Highway and Transportation Officials. Task Force for Roadside Safety
Publisher :
ISBN 13 :
Total Pages : 560 pages
Book Rating : 4.0/5 ( download)
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:
Author : Nikiforos Stamatiadis
Publisher : National Academies Press
ISBN 13 :
Total Pages : 52 pages
Book Rating : 4.3/5 (555 download)
Download or read book Impact of Shoulder Width and Median Width on Safety written by Nikiforos Stamatiadis and published by National Academies Press. This book was released on 2009 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introduction and research approach -- Literature review -- Data analysis -- Design elements recommendations -- Conclusions and suggested research -- References -- Appendix A: Using prediction models to determine relative Safety of design element choices.
Author : Chiara Silvestri Dobrovolny
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (131 download)
Download or read book Development and MASH TL-4 Evaluation of TxDOT Large-scupper Median Barrier for Flood-prone Areas written by Chiara Silvestri Dobrovolny and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Concrete median barriers are designed to mitigate serious cross-median crashes by preventing penetration of errant vehicles into oncoming traffic. When implemented in flood-prone areas, however, solid concrete median barriers can act as a dam to floodwaters, as recently seen in Texas during Hurricane Harvey or in Louisiana and Pennsylvania following severe storms. These severe weather events raise the height of floodwaters and increase the severity of flooding on highways and surrounding roads and communities. In this study, new median barrier options with openings were investigated as a way to reduce flooding. Finite element simulations were used to aid investigation and evaluation of the designs, and laboratory testing was performed to evaluate the hydraulic efficiency of barrier designs in a variety of simulated flood conditions. A concrete single-slope profile median barrier with a large scupper was selected for crash testing following Manual for Assessing Safety Hardware (MASH) Test Level 4 impact conditions and evaluation criteria. The median barrier design was deemed MASH compliant and is ready for implementation in areas susceptible to flooding, with the goals of reducing flooding severity, decreasing associated risk to motorists, and reducing the level of flood damage to both highways and surrounding areas.
Author :
Publisher :
ISBN 13 :
Total Pages : 5 pages
Book Rating : 4.:/5 (173 download)
Download or read book Can Crash Barriers Lessen Cross-median Accidents?. written by and published by . This book was released on 1962 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt:
