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Book Left Turn Signal Warrants for Arizona

Download or read book Left Turn Signal Warrants for Arizona written by J. S. Matthias and published by . This book was released on 1985 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt: A warrant was developed to choose the appropriate type of left turn signal phasing: permissive, exclusive/permissive, or exclusive. Time-lapse photography was used to observe volume and delay data at a total of six arterial-arterial signalized intersections in the Phoenix metropolitan area. From the time-lapse film, data on volume, number of vehicles stopping, total delay, average delay per stopped vehicle, and average delay for all vehicles was obtained for each turning movement. The effect of the type of left turn signal phasing on left turn delay and through delay was analyzed. A three year history of Accident rates for the three types of left turn phasing were also reviewed. The developed warrant chooses the type of left turn phasing based on left turn volume, opposing volume, number of opposing lanes, cycle length, approach speed, sight distance restrictions, and accident history. (Author)

Book Federally Coordinated Program of Highway Research Development and Technology

Download or read book Federally Coordinated Program of Highway Research Development and Technology written by and published by . This book was released on 1983 with total page 838 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Development Evaluation and Application of Left Turn Signal Warrants

Download or read book Development Evaluation and Application of Left Turn Signal Warrants written by Jonathan Upchurch and published by . This book was released on 1991 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study dealt with five types of left turn signal phasing: permissive, leading exclusive, lagging exclusive, leading exclusive/permissive, and lagging exclusive/permissive. The objectives of this research project were to: (1) develop a research work plan to conduct a statistically valid study for the development of numerical warrants for left turn movements; and (2) prepare a database of available information on signalized intersections and select the intersections to be used in the future study. This report describes the database of Arizona signalized intersections created in this project, the findings on left turn accident rates for different types of left turn phasing (using a nonrandom sample), and results of a validation study of the TEXAS computer simulation model. It also presents a research work plan for a future research project.

Book Motor Vehicle Safety

Download or read book Motor Vehicle Safety written by and published by . This book was released on 1983 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reports for 1975- include activities under the National traffic and motor vehicle safety act of 1966 and the Motor vehicle information and cost savings act of 1972.

Book Estimated Highway Planning and Research Program

Download or read book Estimated Highway Planning and Research Program written by and published by . This book was released on 1992 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Impacts on Safety of Left turn Treatment at High Speed Signalized Intersections

Download or read book Impacts on Safety of Left turn Treatment at High Speed Signalized Intersections written by T. H. Maze and published by . This book was released on 1994 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: Left-turning traffic is a major source of conflicts at intersections. Though an average of only 10% to 15% of all approach traffic turns left, these vehicles are involved in approximately 45% of all accidents. This report presents the results of research conducted to develop models which estimate approach accident rates at high speed signalized intersections. The objective of the research was to quantify the relationship between traffic and intersection characteristics, and accident potential of different left turn treatments. Geometric, turning movement counts, and traffic signal phasing data were collected at 100 intersections in Iowa using a questionnaire sent to municipalities. Not all questionnaires resulted in complete data and ultimately complete data were derived for 63 intersections providing a database of 248 approaches. Accident data for the same approaches were obtained from the Iowa Department of Transportation Accident Location and Analysis System (ALAS). Regression models were developed for two different dependent variables: 1) the ratio of the number of left turn accidents per approach to million left turning vehicles per approach, and 2) the ratio of accidents per approach to million traffic movements per approach. A number of regression models were developed for both dependent variables. One model using each dependent variable was developed for intersections with low, medium, and high left turning traffic volumes. As expected, the research indicates that protected left turn phasing has a lower accident potential than protected/permitted or permitted phasing. Left turn lanes and multiple lane approaches are beneficial for reducing accident rates, while raised medians increase the likelihood of accidents. Signals that are part of a signal system tend to have lower accident rates than isolated signals. The resulting regression models may be used to determine the likely impact of various left turn treatments on intersection accident rates. When designing an intersection approach, a traffic engineer may use the models to estimate the accident rate reduction as a result of improved lane configurations and left turn treatments. The safety benefits may then be compared to any costs associated with operational effects to the intersection (i.e., increased delay) to determine the benefits and costs of making intersection safety improvements.

Book Freeway Operations Highway Capacity and Traffic Flow 1991

Download or read book Freeway Operations Highway Capacity and Traffic Flow 1991 written by National Research Council (U.S.). Transportation Research Board and published by . This book was released on 1991 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book U s Department of Transportation Awards to Academic Institutions in Fiscal Year 1983

Download or read book U s Department of Transportation Awards to Academic Institutions in Fiscal Year 1983 written by G. Megerian and published by . This book was released on 1984 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Transportation Research Record

Download or read book Transportation Research Record written by and published by . This book was released on 1997 with total page 730 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Awards to Academic Institutions by the Department of Transportation

Download or read book Awards to Academic Institutions by the Department of Transportation written by and published by . This book was released on 1983 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book HRIS Abstracts

Download or read book HRIS Abstracts written by and published by . This book was released on 1988 with total page 956 pages. Available in PDF, EPUB and Kindle. Book excerpt: