Download or read book Development of Warrants for Right turn Treatments at Unsignalized Intersections written by Tanweer Hasan and published by . This book was released on 1998 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Development of Warrants for Installation of Dual Right turn Lanes at Signalized Intersections written by Yi Qi and published by . This book was released on 2012 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: Right-turn lanes provide space for the deceleration and storage of right-turn vehicles, and separate turning vehicles from through movements. Dual right-turn lanes are increasingly used at urban intersections primarily for two reasons: (1) to accommodate high right-turn demands and avoid turn-pocket overflows, and/or (2) to prevent right-turn vehicles that exit from a nearby upstream freeway off-ramp (on the left of the roadway) from abruptly changing too many lanes toward the right-turn lane at the intersection. In addition, a number of other factors may affect the decisions on the installation of dual right-turn lanes. However, warrants for dual right lane installation are almost non-existent, leaving traffic engineers to rely on engineering judgment. This research aims to develop warrants for installation of dual right-turn lanes at signalized intersections. Both the operational and safety benefits/costs were analyzed by surveying traffic engineers and by conducting traffic simulation-based analysis. Microscopic traffic simulation model, VISSIM, was used to quantify the operation benefits and Surrogate Safety Assessment Model (SSAM) developed by Siemens was used to analyze the safety gains due to installation of dual right-turn lanes.
Download or read book Development of Left turn Lane Warrants for Unsignalized Intersections written by and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Left-turn movements at intersections, including driveways - especially movements that are made from lanes that are shared with through traffic - cause delays and adversely impact safety. Although left-turn warrants have been updated, many agencies still use research performed by M. Harmelink from the mid-1960s. While most states use procedures that are based on Harmelink, a number of limitations of Harmelink's procedure have been identified. Economic analysis can provide a useful method for combining traffic operations and safety benefits of left-turn lanes to identify situations in which left-turn lanes are and are not justified economically. This project used a benefit-cost approach to determine when a left-turn lane would be justified. The steps included simulation to determine delay savings from installing a left-turn lane, crash costs and crash reduction savings determined from safety performance functions and accident modification factors available in the "Highway Safety Manual," and construction costs. Left-turn lane warrants were developed for rural two-lane highways, rural four-lane highways, and urban and suburban roadways. In addition, warrants for bypass lanes were developed for rural two-lane highways. A "Design Guide on Left-Turn Accommodations at Unsignalized Intersections" was developed that discusses left-turn lane designs, traffic control treatments, and case study examples.
Download or read book Left turn Accommodations at Unsignalized Intersections written by Kay Fitzpatrick and published by Transportation Research Board. This book was released on 2013 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: "TRB's National Cooperative Highway Research Program (NCHRP) Report 745: Left-Turn Accommodations at Unsignalized Intersections presents guidance for the selection and design of left-turn accommodations at unsignalized intersections. The report includes 11 case studies of typical situations that illustrate the use of the guidance." -- publisher's description.
Download or read book Development of Warrants for Left turn Phasing written by Kenneth R. Agent and published by . This book was released on 1976 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Development of Warrants for Left turn Lanes written by Kenneth R. Agent and published by . This book was released on 1979 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Development of Warrants for Left turn Lanes at Unsignalized Intersections in Korea written by Kyung-Whan Kim and published by . This book was released on 1986 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Volume Warrants for Left turn Lanes at Unsignalized Grade Intersections written by M. D. Harmelink and published by . This book was released on 1967 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Guidelines for Right turn Treatments at Unsignalized Intersections and Driveways written by Tanweer Hasan and published by . This book was released on 1996 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: Guidelines for right-turn treatments at unsignalized intersections and driveways on the state highway system of Kansas were developed in this study. Two types of treatments, full-width lane and taper, were considered over the do-nothing radius treatment. THe guidelines were based on the results of an economic analysis conducted over a wide range of traffic volumes and speeds. A simple model was developed to determine the operational effects of right-turn movements at unsignalized intersections and driveways on high-speed highways. The operational effects were estimated in terms of delay and excess fuel consumption experienced by through vehicles due to the right turns. The relationship between speed differential and accidents was used to estimate the reduction in right-turn same direction rear-end accidents that would be expected to result from the provision of a right-turn treatment. Comparison with other guidelines and validation of existing right-turn treatments at the study sites indicate that the range of the guidelines developed in this study isre reasonable. They are also more definitive because they consider highway operating speed. They are more flexible in determining an appropriate treatment because an intermediate taper treatment is considered.
Download or read book Development of Pedestrian Safety Based Warrants for Permissive Left turn Control written by Qi Yi (Ph.D.) and published by . This book was released on 2010 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Methods of Increasing Pedestrian Safety at Right turn on red Intersections Users Manual written by Charles V. Zegeer and published by . This book was released on 1986 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The purpose of this study was to determine current motorist compliance to RTOR regulations, develop and field test countermeasures for RTOR pedestrian accidents, and develop improved warrants and guidelines for prohibition of RTOR. Based on data from several U.S. cities, only 3.7 percent of all right-turning drivers violate no turn on red (NTOR) signs. However, of drivers with an opportunity to turn right on red, 20 percent violated the sign. At locations with RTOR allowed, 56.9 percent of motorists do not come to a complete stop before turning right on red. Based on conflict and violation data, 30 countermeasures were developed as possible treatments for RTOR-pedestrian accidents. Seven of these were field tested, including an offset stop bar, a red ball (symbolic) NTOR sign, a larger 30x36-in (75x90-cm) NTOR sign, a Look For Turning Vehicles pavement marking, a NTOR When Pedestrians Are Present sign, and an electronic variable message (blank-out) NTOR sign. Several promising applications for the devices were recommended. A critique was made of the current MUTCD guidelines on RTOR prohibition. Based on an analysis of conflicts at 199 intersection approaches, improved guidelines were recommended"--Technical report documentation page
Download or read book Roundabouts in the United States written by Lee Rodegerdts and published by Transportation Research Board. This book was released on 2007 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Research sponsored by the American Association of State Highway and Transporation Officials in cooperation with the Federal Highway Administration."
Download or read book Development of Guidelines for Pedestrian Safety Treatments at Signalized Intersections written by James A. Bonneson and published by . This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication analyses driving-simulation based experiments conducted to identify and assess the impacts of the factors that contribute to the crashes between left-turn vehicles and pedestrians during the permissive left-turn phase, and develop pedestrian safety based warrants.
Download or read book The Development of Criteria for the Treatment of Right Turn Movements on Rural Roads written by Benjamin H. Cottrell and published by . This book was released on 1981 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this research-was to develop criteria or guidelines for the treatment of right turn movements at nonsignalized intersections on rural roads. It was necessary for the criteria to be applicable for a wide range of conditions. A survey of state departments of transportation and Virginia Department of Highways and Transportation district traffic engineers identified the criteria presently used and the factors to be considered in establishing criteria. The decisions for right turn treatments are primarily based on judgment or rule of thumb. Field work identified the range of conditions and effectiveness of the treatments. The guidelines were developed through an analysis of the field data, the survey, and judgment. They are based on the peak hour (or design hour) volumes for right turn traffic and total traffic on the approach to the right turn treatment. Guidelines are available for 2-lane and 4-lane roadways. Other factors to be considered are noted. It is recommended that the guidelines, presented in this report be adopted by the Virginia Department of Highways and Transportation as an aid in selecting the appropriate treatment for right turn movements on rural roads.
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 Warrants for Right turn Lanes treatments on Two lane Roads written by Amiy Varma and published by . This book was released on 2008 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of this project was to analyze geometric, speed, volume, and crash data for a broad range of conditions with the ultimate objective of establishing bases for warrants for right-turn lanes on two-lane roads where major approach did not have any controls. Right-turn lane guidelines for this contest is not clear and convincing. Safety effectiveness and savings were estimated using extensive data examination and analysis of crash data, several statistical models that were developed using crash data, and a conflict model, which was developed using field data. It was found that not all accidents are eliminated with use of right-turn lane. However, right-turn lanes were effective in improving safety. More interesting was the finding that safety effectiveness of right-turn lanes was more at driveways than at intersections. Operational effectiveness was estimated using a delay model and a fuel consumption model, which were developed using field data, simulation software (CORSIM®), and statistical software, Minitab®. The volume thresholds that varied with changes in right-turn lane cost and fuel cost were provided as alternative scenarios for warrants. The warrants established here will be helpful in decision-making regarding whether to implement a right-turn lane or not on two-lane roads.
Download or read book Pedestrian Facilities Users Guide Providing Safety and Mobility written by Charles V. Zegeer and published by DIANE Publishing. This book was released on 2002 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: This guide is intended to provide information on how to identify safety and mobility needs for pedestrians with the roadway right-of-way. Useful for engineers, planners, safety professionals and decision-makers, the guide covers such topics as: the Walking Environment including sidewalks, curb ramps, crosswalks, roadway lighting and pedestrian over and under passes; Roadway Design including bicycle lanes, roadway narrowing, reducing the number of lanes, one-way/two-way streets, right-turn slip lanes and raised medians; Intersections with roundabouts, T-intersections and median barriers; and Traffic calming designs.
