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:
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 98 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.
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:
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.
Download or read book Evaluation of Safety Effectiveness of Median Cable Barriers Installed on Freeways in Ohio written by Mohammad Almothaffar and published by . This book was released on 2018 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Ohio Department of Transportation (ODOT) began installing median cable barriers in 2003 along highway medians for all roadways that were narrower than 59 ft. The central goal of this work was to prevent cross-median crashes (CMCs) that raised a concern due to their frequencies and severe injuries they caused when they occurred. Cross-median crashes occur when a vehicle leaves its travel way, enters or crosses the dividing median, and collides with vehicles moving in the opposite direction. This study received data from 41 locations totaling about 201 miles of installed median cable barriers in the years 2009-2014. These locations experienced 2,498 median related crashes before and after installation. The study involved a review of police reports to identify target crashes and the manner in which the vehicles hit or crossed the cable barriers, either by penetrating the cables, over-riding, under-riding, stopped, or redirected. A detailed analysis of cable hits was also conducted. The study found that median cable barriers were effective in stopping vehicles from breaching the barrier; 95.4 percent of all cable median barrier crashes had no penetration of the cable barrier, i.e., the vehicles where stopped or bounced by the cables. This thesis study summarizes some key findings of safety effectiveness evaluation of the median cable barriers in Ohio. The findings of overall statewide crash reduction after the median cable barriers compared to before period are based on the safety effectiveness percentages computed by Empirical Bayes (EB) before-after study method using the Highway Safety Manual's (HSM) procedures. Safety effectiveness of Ohio's statewide cable barriers was found to be 73.9 percent for total crashes, 80.4 percent for fatal and injury (FI) crashes combined and 80.1 percent for fatal, incapacitating, and non-incapacitating injury (KAB) crashes combined. Therefore, the estimated crash modification factors (CMFs) for median cable barriers installed in Ohio's Interstate system for total, FI, and KAB crashes are 0.261, 0.196, and 0.199, respectively. Overall, the evaluation results show that the median cable barriers installed in Ohio's Interstate system are effective in reducing cross-median severe injury crashes, which was the main objective of ODOT's installing median barriers in their Interstate highway system.
Download or read book A Five year Analysis of the Safety Impacts of Crossover Median Crashes in Wisconsin written by Adrian Witte and published by . This book was released on 2006 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Download or read book Safety Evaluation written by California. Department of Transportation and published by . This book was released on 1983 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hierarchical Bayesian Methods for Evaluation of Traffic Project Efficacy written by Andrew N. Olsen and published by . This book was released on 2011 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: Using the models selected for analysis, it was determined that cable barriers are quite effective at reducing sever crashes and cross-median crashes on Utah highways. Raised medians are also largely effective at reducing sever crashes. The results of before and after analyses are highly valuable to Departments of Transportation in identifying effective projects and in determining which roadway segments will benefit most from their implementation.
Download or read book Guidance for Implementation of the AASHTO Strategic Highway Safety Plan written by Timothy R. Neuman and published by Transportation Research Board. This book was released on 2008 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: Also available online via the Web pages of the TRB Cooperative Research Programs (www4.trb.org/trb/crp.nsf).
Download or read book Evaluation of Iowa s 70 Mph Speed Limit written by Reginald R. Souleyrette and published by . This book was released on 2009 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: Simple descriptive statistics reveal increases in all crash severity categories for the 2 1/2 year period following the speed limit increase when compared to the most recent comparable 2 1/2-year period prior to the increase. When compared to longer term trends, the increases were less pronounced in some severity levels and types, and for a few severity levels the average crash frequencies were observed to decrease. Few of the changes in crash frequency were larger than the normal year to year variation in these statistics. However, fatal and other serious cross-median crashes increased by relatively larger amounts as compared to expected random variation. Most of this increase was concentrated in the last half of 2005 and represents relatively small numbers of crashes (statistically speaking). The study also analyzed crash frequencies grouped into six-month periods, revealing similar findings.
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.
Download or read book Special Safety Improvements Program Evaluation Report written by and published by . This book was released on 1977 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Simulation of Cross median Crashes written by Paul H. Wright and published by . This book was released on 1971 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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:
Download or read book Crash Testing and Evaluation of F shape Barriers on Slopes written by Nauman M. Sheikh and published by . This book was released on 2008 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Roadside Safety Analysis Program RSAP written by King K. Mak and published by Transportation Research Board. This book was released on 2003 with total page 77 pages. Available in PDF, EPUB and Kindle. Book excerpt:
