Download or read book Potential Safety Effects of Dynamic Signing at Rural Horizontal Curves written by Howard Preston and published by . This book was released on 1999 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluation of Dynamic Speed Feedback Signs on Curves written by Shauna L. Hallmark and published by . This book was released on 2015 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lane departure crashes are a significant safety concern. The majority of lane departure crashes occur on rural two-lane roadways, with a disproportionate number of these crashes on horizontal curves. Curve-related crashes involve a number of roadway and driver causative factors. A primary driver factor is speeding. Dynamic speed feedback sign (DSFS) systems are one method to reduce vehicle speeds and, consequently, crashes on curves. These systems show promise but they have not been fully evaluated on curves. The Center for Transportation Research and Education at Iowa State University conducted a national demonstration project to evaluate the effectiveness of two different DSFSs in reducing speed and crashes on curves at 22 total sites on rural two-lane roadways in seven States. The goal is to provide traffic safety engineers and other professionals with additional tools to manage speeds and crashes on rural horizontal curves more effectively. Data were collected before and at 1, 12, and 24 months after installation of the DSFS. On average, most sites had decreases in mean speeds, with decreases up to 10.9 miles per hour (mph) noted for both the point of curvature (PC) and center of curve (CC). Most sites experienced changes in 85th percentile speed of 3 mph or more at the PC, with the majority of sites having a decrease of 2 mph at the CC. The numbers of vehicles traveling 5, 10, 15, or 20 mph over the posted or advisory speed limit were also compared. Large reductions in the number of vehicles traveling over the posted or advisory speed occurred for all of the after periods at the PC and CC, indicating that the signs were effective in reducing high-end speeds, as well as average and 85th percentile speeds. A before-and-after crash analysis was also conducted, and crash modification factors (CMF) were developed. CMFs ranged from 0.93 to 0.95 depending on the crash type and direction of the crash.
Download or read book Low cost Treatments for Horizontal Curve Safety written by and published by . This book was released on 2006 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nearly 25 percent of fatal crashes occur at or near a horizontal curve. Hence, addressing the safety problem at horizontal curves is one of the 22 emphasis areas of the Strategic Highway Safety Plan prepared by AASHTO. Also, crashes at horizontal curves are a big component of the road departure crash problem, which is one of FHWA's three focus areas. This publication was prepared to provide practical information on low-cost treatments that can be applied at horizontal curves to address identified or potential safety problems. The publication concisely describes the treatment; shows examples; suggests when the treatment might be applicable; provides design features; and where available, provides information on the potential safety effectiveness and costs. The treatments include: Basic traffic signs and markings found in the MUTCD; Enhanced traffic control devices; Additional traffic control devices not found in the MUTCD; Rumble strips; Minor roadway improvements; Innovative and experimental treatments. The publication concludes with a description of maintenance activities that should be conducted to keep the treatments effective.
Download or read book Highway Safety Research Agenda written by Charles V. Zegeer and published by . This book was released on 2013 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: "TRB's National Cooperative Highway Research Program (NCHRP) 756: Highway Safety Research Agenda: Infrastructure and Operations develops a proposed agenda of prioritized safety research needs in the area of highway infrastructure and operations. The report provides options to the U.S. transportation community on how to direct research to the areas where it can provide the most benefit. The agenda is based on a prioritization methodology developed by the research team which can be applied on a recurring basis to update the agenda over time. Both the agenda and the methodology documented in this report will assist government officials, private sector employees, and academics with managing highway safety research. In addition to the report, 16 unpublished appendices (Appendices A-O and R) have been made available electronically."--Publisher description.
Download or read book Safety Effects of Geometric Improvements on Horizontal Curves written by Charles V. Zegeer and published by . This book was released on 1991 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: Horizontal curves represent a considerable safety problem on rural two-lane highways. Curves experience a higher accident rate than tangents. Current road improvements highlight the issue of what else should be done at horizontal curves to enhance (or at least hold constant) the level of safety at these sites. There has been a need to better quantify accident effects of curve features and to quantify the effects on accidents of curve flattening, curve widening, addition of spiral transitions, improvement to deficient superelevation, and improvements to the roadside. The purpose of this research was to determine the horizontal curve features which affect accident experience on two lane rural roads and, also, to determine which types of geometric improvements on curves will affect accident experience and to what extent.
Download or read book Communicating Changes in Horizontal Alignment written by R. W. Lyles and published by Transportation Research Board National Research. This book was released on 2006 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Safety Evaluation of Horizontal Curve Realignment on Rural Two lane Roads written by and published by . This book was released on 2017 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: Technical brief on evaluated realignment of horizontal curves on rural two-lane roads based on before-after evaluations to reduce lane departure crashes, especially run-off-road crashes.
Download or read book Guidance for Implementation of the AASHTO Strategic Highway Safety Plan written by National Cooperative Highway Research Program and published by . This book was released on 2004 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Safety effects of horizontal curve and grade combinations on rural two lane highways written by Karin M. Bauer and published by . This book was released on 2014 with total page 55 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Safety Factors of Horizontal Curves on Rural Two lane Highways written by Vertie Louise Jordan and published by . This book was released on 2008 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Safety Effects of Horizontal Curve and Grade Combinations on Rural Two lane Highways written by and published by . This book was released on 2014 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Safety Effects of Design Improvements on Horizontal Curves written by Charles V. Zegeer and published by . This book was released on 1990 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Highway Safety Research Agenda Infrastructure and Operations written by Charles V. Zegeer and published by Transportation Research Board. This book was released on 2013 with total page 103 pages. Available in PDF, EPUB and Kindle. Book excerpt: "TRB's National Cooperative Highway Research Program (NCHRP) 756: Highway Safety Research Agenda: Infrastructure and Operations develops a proposed agenda of prioritized safety research needs in the area of highway infrastructure and operations. The report provides options to the U.S. transportation community on how to direct research to the areas where it can provide the most benefit. The agenda is based on a prioritization methodology developed by the research team which can be applied on a recurring basis to update the agenda over time. Both the agenda and the methodology documented in this report will assist government officials, private sector employees, and academics with managing highway safety research. In addition to the report, 16 unpublished appendices (Appendices A-O and R) have been made available electronically."--Publisher description.
Download or read book Safety Improvements on Horizontal Curves for Two lane Rural Roads written by 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 Safety Improvements on Horizontal Curves for Two lane Rural Roads written by Charles V. Zegeer and published by . This book was released on 1990 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Roundabouts written by Lee August Rodegerdts and published by Transportation Research Board. This book was released on 2010 with total page 407 pages. Available in PDF, EPUB and Kindle. Book excerpt: TRB's National Cooperative Highway Research Program (NCHRP) Report 672: Roundabouts: An Informational Guide - Second Edition explores the planning, design, construction, maintenance, and operation of roundabouts. The report also addresses issues that may be useful in helping to explain the trade-offs associated with roundabouts. This report updates the U.S. Federal Highway Administration's Roundabouts: An Informational Guide, based on experience gained in the United States since that guide was published in 2000.
Download or read book Superelevation Distribution Methods and Transition Designs written by James A. Bonneson and published by Transportation Research Board. This book was released on 2000 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:
