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Safety Evaluation Of Improved Curve Delineation
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Author :U. S. Department Of Transportation Publisher :Createspace Independent Publishing Platform ISBN 13 :9781723230493 Total Pages :56 pages Book Rating :4.2/5 (34 download)
Book Synopsis Safety Evaluation of Improved Curve Delineation by : U. S. Department Of Transportation
Download or read book Safety Evaluation of Improved Curve Delineation written by U. S. Department Of Transportation and published by Createspace Independent Publishing Platform. This book was released on 2018-07-18 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: Safety evaluation of improved curve delineation [electronic resource] /
Book Synopsis Safety evaluation of improved curve delineation by :
Download or read book Safety evaluation of improved curve delineation written by and published by . This book was released on 2009 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Federal Highway Administration (FHWA) organized a pooled fund study of 26 States to evaluate low-cost safety strategies as part of its strategic highway safety effort. One of the strategies chosen to be evaluated for this study was improving curve delineation. Geometric, traffic, and crash data were obtained at 89 treated curves in Connecticut and 139 treated curves in Washington to determine the safety effectiveness of improved curve delineation. Treatments varied by site and included new chevrons, horizontal arrows, and advance warning signs as well as the improvement of existing signs using fluorescent yellow sheeting. All sites were on two lane rural roads. To account for potential selection bias and regression to the mean, an Empirical Bayes (EB) before after analysis was conducted. The aggregate results revealed an 18% reduction in injury and fatal crashes, a 27.5% reduction in crashes during dark conditions, and a 25% reduction in lane departure crashes during dark conditions. The reductions were more prominent at locations with higher traffic volumes and sharper curves (curve radius less than 492 ft) and in locations with more hazardous roadsides (roadside hazard rating (RHR) of 5 or higher) compared to locations with less hazardous roadsides (RHR of 4 or lower). In addition, curves where more signs were either added or replaced (with a more retroreflective material) within the curve experienced larger reductions in crashes. An economic analysis revealed that improving curve delineation with signing improvements is a very cost effective treatment with the benefit cost ratio exceeding 8:1.
Book Synopsis Safety Evaluation of Improved Curve Delineation by : Raghavan Srinivasan (Transportation engineer)
Download or read book Safety Evaluation of Improved Curve Delineation written by Raghavan Srinivasan (Transportation engineer) and published by . This book was released on 2009 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Safety Evaluation of Permanent Raised Pavement Markers by : Geni Brafman Bahar
Download or read book Safety Evaluation of Permanent Raised Pavement Markers written by Geni Brafman Bahar and published by Transportation Research Board. This book was released on 2004 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt: "TRB's National Cooperative Highway Research Program (NCHRP) Report 518: Safety Evaluation of Permanent Raised Pavement Markers examines the safety performance of snowplowable permanent raised pavement markers on two-lane roadways and four-lane freeways"--Publisher's description.
Book Synopsis Evaluation of Innovative Approaches to Curve Delineation for Two-Lane Rural Roads by : Ronald Gibbons
Download or read book Evaluation of Innovative Approaches to Curve Delineation for Two-Lane Rural Roads written by Ronald Gibbons and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Run-off-road crashes are a major problem for rural roads. These roads tend to be unlit, and drivers may have difficulty seeing or correctly predicting the curvature of horizontal curves. This leads to vehicles entering horizontal curves at speeds that are too high, which can often lead to vehicles running off the roadway. This study was designed to examine the effectiveness of a variety of active and passive curve warning and curve delineation systems on two two-lane rural roads to determine which is the most effective at reducing vehicle speeds and assisting lane-keeping. The study consisted of a human-factors study, as well as an observational study. There were nine curves examined in the study on two road sections in Southwest Virginia. The human-factors study included participants whose speed and lane position were tracked as they drove through eight curves, both before and after new treatments were installed in each of the eight curves. The observational study examined the speed and lane position of traffic on all the curves before and after the installation of the new treatments. The observational study included a curve on a road near the primary study section. The results of the study were mixed, with every tested system leading to some reductions in speed or encroachments at some parts of the curve while also leading to increases in the same values at other parts of the curve. No clear difference was discovered between passive and active systems or between delineation and warning systems. The study recommends that in addition to a safety assessment, specific curve characteristics and budget should be the main considerations in the selection of a treatment for a curve.
Book Synopsis Simulator evaluation of low-cost safety improvements on rural two-lane undivided roads by :
Download or read book Simulator evaluation of low-cost safety improvements on rural two-lane undivided roads written by and published by . This book was released on 2009 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Cost-effective Geometric Improvements for Safety Upgrading of Horizontal Curves by : Charles V. Zegeer
Download or read book Cost-effective Geometric Improvements for Safety Upgrading of Horizontal Curves written by Charles V. Zegeer and published by . This book was released on 1990 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Simulator Evaluation of Low-cost Safety Improvements on Rural Two-lane Undivided Roads by : John A. Molino
Download or read book Simulator Evaluation of Low-cost Safety Improvements on Rural Two-lane Undivided Roads written by John A. Molino and published by . This book was released on 2010 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: This experiment was sponsored by the Low Cost Safety Improvements Pooled Fund Study. It focused on two areas: (1) advanced detection and speed reduction for curves in rural two lane roads at night and (2) traffic calming for small rural towns during the day. The experiment was conducted in the Federal Highway Administration (FHWA) Highway Driving Simulator (HDS). Speed reduction in curves yielded the following order of tested treatments (from best to worst): (1) post mounted delineators (PMDs) enhanced by streaming light emitting diode (LED) lights slowed drivers down the most (9 mi/h (14.5 km/h)); (2) standard PMDs slowed drivers down by 7 to 8 mi/h (11.3 to 12.9 km/h); and (3) edge lines slowed drivers down by 2 mi/h (3.2 km/h). The same order was obtained for increases in the distance at which drivers were able to identify either the direction or the severity of the curve ahead as follows: streaming LED PMDs increased detection distance the most (560 to 1,065 ft (171 to 325 m)); standard PMDs increased detection distance by 45 to 200 ft (13.7 to 61 m); and edge lines increased detection distance by zero to 25 ft (zero to 7.6 m). PMDs performed better than pavement markings. The streaming PMDs solution offered the greatest potential increase in recognition distance. Speed reduction in towns yielded the following order of tested treatments: (1) chicanes slowed drivers down the most by 4 to 9 mi/h (6.4 to 14.5 km/h); (2) parked cars on both sides of the road slowed drivers 4 mi/h (6.4 km/h); and (3) bulb outs resulted in only a small speed reduction of 1 mi/h (1.6 km/h) or none at all. In the case of towns, two low cost safety solutions are worthy of further study: (1) adding painted chicanes to town entrances and (2) providing for and encouraging parking in the town. The results of this experiment do not take into account other hazardous factors that exist in the real world. Therefore, field validation is recommended for most of the above findings.
Download or read book Public Roads written by and published by . This book was released on 1999 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Curve Delineation and Accidents by : William C. Taylor
Download or read book Curve Delineation and Accidents written by William C. Taylor and published by . This book was released on 1966 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book WisDOT Research Program written by and published by . This book was released on 2009 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Guidance for Implementation of the AASHTO Strategic Highway Safety Plan by : Timothy R. Neuman
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).
Book Synopsis Safety Data, Analysis, and Evaluation, 2009 by :
Download or read book Safety Data, Analysis, and Evaluation, 2009 written by and published by . This book was released on 2009 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "These 13 papers are concerned with safety data, analysis and evaluation. Specific topics discussed include the following: calibration of the Highway Safety Manual's accident prediction model for a secondary road network; speed and safety; accident modification functions; elementary units of exposure; identifying crash hot spots; safety of lane and shoulder width combinations on rural roads; effects of pavement marking retroreflectivity on traffic crash frequency; road data aggregation and sectioning for crash analysis; safety evaluation of curve delineation improvements; microsimulation to study a traffic signal incident reduction function; comparison of simulated freeway safety performance with observed crashes; traffic operation measures in the safety analysis of signalized intersections; and different parameterizations of the varying dispersion parameter as a function of segment length."--Pub. desc
Book Synopsis Uniform Vehicle Code and Model Traffic Ordinance by : National Committee on Uniform Traffic Laws and Ordinances
Download or read book Uniform Vehicle Code and Model Traffic Ordinance written by National Committee on Uniform Traffic Laws and Ordinances and published by . This book was released on 1987 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Evaluation of Criteria for Safety Improvements on the Highways by : Roy Jorgensen and Associates
Download or read book Evaluation of Criteria for Safety Improvements on the Highways written by Roy Jorgensen and Associates and published by . This book was released on 1966 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Recent Advances in Traffic Engineering by : Ashish Dhamaniya
Download or read book Recent Advances in Traffic Engineering written by Ashish Dhamaniya and published by Springer Nature. This book was released on 2023-10-28 with total page 618 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book comprises select peer-reviewed proceedings of the National Conference on Recent Advances in Traffic Engineering (RATE 2022). The contents includes in-depth insights into the domain of traffic engineering and planning and presents the latest advancements by focusing on traffic engineering, traffic flow, road safety, advanced techniques for transportation surveys, and data collection. It covers topics including travel demand modeling and transportation planning issues. The contents of this book offer up-to-date and practical knowledge on different aspects of traffic engineering. It will be useful for researchers as well as practitioners.
Book Synopsis Evaluation of Safety Strategies at Signalized Intersections by : Raghavan Srinivasan
Download or read book Evaluation of Safety Strategies at Signalized Intersections written by Raghavan Srinivasan and published by Transportation Research Board. This book was released on 2011 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: TRB’s National Cooperative Highway Research Program (NCHRP) Report 705: Evaluation of Safety Strategies at Signalized Intersections explores crash modification factors (CMFs) for safety strategies at signalized intersections. CMFs are a tool for quickly estimating the impact of safety improvements.
