Download or read book Computer Simulation Study of the Operational Effects of Two way Left turn Lanes on Urban Four lane Roadways written by Patrick T. McCoy and published by . This book was released on 1988 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Cost effectiveness Evaluation of Two way Left turn Lanes on Urban Four lane Roadways written by Patrick T. McCoy and published by . This book was released on 1986 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report documents the research done to develop guidelines for the use of two-way left-turn lane medians on urban four-lane roadways.

Download or read book Capacity and Operational Effects of Midblock Left turn Lanes written by James A. Bonneson and published by Transportation Research Board. This book was released on 1997 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this research project was to develop a methodology for evaluating alternative midblock left-turn treatments on urban and suburban arterials. The methodology had to be applicable to three common midblock left-turn treatments: the raised-curb median, the flush median with two-way left-turn lane (TWLTL) delineation, and the undivided cross section. The methodology developed for this research focuses on the evaluation of midblock street segments on urban and suburban arterials. The basis for NCHRP Report 395.

Download or read book Impacts of Access Management Techniques written by Jerome S. Gluck and published by Transportation Research Board. This book was released on 1999 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Geometric Design and Operational Effects written by National Research Council (U.S.). Transportation Research Board and published by . This book was released on 1988 with total page 694 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Transportation Research Record written by and published by . This book was released on 1997 with total page 598 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book National Cooperative Highway Research Program Report written by and published by . This book was released on 1964 with total page 994 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Report written by and published by . This book was released on 1999 with total page 522 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Operational Impacts of Median Width on Larger Vehicles written by Douglas W. Harwood and published by Transportation Research Board. This book was released on 2000 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: This synthesis report will be of interest to officials and staff of municipal, regional, and statewide transportation agencies responsible for roadway design and traffic control. It will be of special interest to those concerned with intersections and driveways on divided highways where larger vehicles encounter narrow medians. It will also be of interest to other professionals who interact with these agencies to mitigate such problems. This report presents state-of-the-practice information about current median design policies and practices, describes the traffic operational and safety problems encountered in designing for larger vehicles at divided highway intersections, and identifies alternative improvement techniques that can be used in new construction or reconstruction projects to avoid introducing traffic operational and safety problems. This TRB report focuses on 10 alternative cross sections widely used on arterial highways in urban, suburban, and rural environment.

Download or read book Assessment of the Benefits for Two way Center Left turn Lanes CLTL written by Tapan K. Datta and published by . This book was released on 1994 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Cost effectiveness Methodology for Two way Left turn Lanes on Urban Four lane Roadways written by and published by . This book was released on 1988 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book HRIS Abstracts written by and published by . This book was released on 1990 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Investigation of the Impact of Medians on Road Users Final Report written by Brian Lee Bowman and published by . This book was released on 1994 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Guidelines for the Conversion of Urban Four lane Undivided Roadways to Three lane Two way Left turn Lane Facilities written by Keith K. Knapp and published by . This book was released on 2001 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: At and above 1,750 vehicles per hour, the simulation indicated a reduction in arterial level of service. Therefore, at least in Iowa, the feasibility of a four-lane undivided to three-lane conversion should be questioned and/or considered much more closely when a roadway has (or is expected to have) a peak-hour volume of more than 1,750 vehicles. Assuming that 10 percent of the daily traffic occurs during the peak-hour, these volume recommendations would correspond to 15,000 and 17,500 vehicles per day, respectively. These suggestions, however, are based on the results from one idealized case xi study corridor analysis. Individual operational analysis and/or simulations should be completed in detail once a four-lane undivided to three-lane cross section conversion is considered feasible (based on the general suggestions above) for a particular corridor. All of the simulations completed as part of this project also incorporated the optimization of signal timing to minimize vehicle delay along the corridor. A number of determination feasibility factors were identified from a review of the past research, before-and-after case study results, and the simulation sensitivity analysis. The existing and expected (i.e., design period) statuses of these factors are described and should be considered. The characteristics of these factors should be compared to each other, the impacts of other potentially feasible cross section improvements, and the goals/objectives of the community. The factors discussed in these guidelines include - roadway function and environment - overall traffic volume and level of service - turning volumes and patterns - frequent-stop and slow-moving vehicles - weaving, speed, and queues - crash type and patterns - pedestrian and bike activity - right-of-way availability, cost, and acquisition impacts - general characteristics, including - parallel roadways - offset minor street intersections - parallel parking - corner radii - at-grade railroad crossings xii The characteristics of these factors are documented in these guidelines, and their relationship to four-lane undivided to three-lane cross section conversion feasibility identified. This information is summarized along with some evaluative questions in this executive summary and Appendix C. In summary, the results of past research, numerous case studies, and the simulation analyses done as part of this project support the conclusion that in certain circumstances a four-lane undivided to three-lane conversion can be a feasible alternative for the mitigation of operational and/or safety concerns. This feasibility, however, must be determined by an evaluation of the factors identified in these guidelines (along with any others that may be relevant for a individual corridor). The expected benefits, costs, and overall impacts of a four-lane undivided to three-lane conversion should then be compared to the impacts of other feasible alternatives (e.g., adding a raised median) at a particular location.

Download or read book Investigation of the Impact of Medians on Road Users written by Brian Lee Bowman and published by . This book was released on 1994 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this study is to determine the safety impact of raised curb medians, two-way left-turn lane (TWLT) medians, and undivided cross sections on vehicular and pedestrian traffic. This study concentrates on medians located on unlimited access arterials in central business districts (CBDs) and suburban environments. A total of 32,894 vehicle and 1,012 pedestrian accidents were analyzed from 145.9 mi (234.8 km) of unlimited access arterials located in three large metropolitan areas. Operational data in the form of vehicle-pedestrian conflicts, pedestrian walking speed, and pedestrian use of medians for refuge were obtained and analyzed as part of the study.

Download or read book Highway Research Abstracts written by and published by . This book was released on 1994 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Safety and Operational Characteristics of Two way Left turn Lanes written by Vijay Talada and published by . This book was released on 2006 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this research was to evaluate the safety and operational characteristics of two-way left-turn lanes (TWLTLs) compared to four-lane undivided roadways in Minnesota. Research tasks to achieve this purpose consisted of a comprehensive literature review, data collection from the identified study sites, and statistical data analysis. Nine study sites were selected, located throughout the state of Minnesota. Operational and crash data were analyzed before and after the conversion from a four-lane undivided roadway to a three-lane roadway with a TWLTL. The results of a yoked/group comparison analysis showed statistically significant reductions in total crashes, PDO crashes and left turn crashes. The percentage reductions in total crashes, PDO crashes and left turn crashes after the conversion were approximately 37 percent, 46 percent and 24 percent, respectively. The reductions in crash rates for total crashes and PDO crashes were found statistically significant and the percentage reductions were 46 percent and 45 percent, respectively. Additionally, the change in the mean speed and 85th percentile speed were found statistically significant, but in both cases the change was less than two miles per hour. The results of this research show that safety characteristics of a roadway are improved when a four-lane undivided roadway is converted to a three-lane roadway with a TWLTL when daily traffic volumes are less than 17,500 vehicles per day.