[PDF] Capacity And Level Of Service At Unsignalized Intersections eBook

Author : Nicholas J. Garber
Publisher :
Page : 270 pages
File Size : 10,43 MB
Release : 1996
Category : Highway capacity
ISBN :

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A number of methodologies have been employed to determine the operational performance, or level of service, of unsignalized intersections. The latest methodology embraced by the 1994 Highway Capacity Manual uses an average total delay measure as the determinant of level of service. This study compared field measures of delay to the values generated by the 1994 Highway Capacity Software to determine whether the new methodologies produced acceptable results for delay and level of service for two-way and all-way stop-controlled, unsignalized intersections. The relation of safety characteristics to operational performance levels at unsignalized intersections was also investigated. The objective was to create a relationship between accident rate and average total delay that determines the safety of the unsignalized intersection. Other variables were introduced, identified, and incorporated with delay into a predictive model for both two-way and all-way stop-controlled, unsignalized intersections. The findings of this study supported the statement that the unsignalized intersection module of the 1994 Highway Capacity Manual produced results comparable to manual field calculations. Although there was some slight difference between the two delays with regard to specific numbers, the values measured in the field fell within the correct ranges of level of service as determined by the two-way and all-way stop-controlled intersection 1994 Highway Capacity Manual methodologies. A relationship between safety and level of service was also determined. For the range of variables used, this model provided a basic framework for evaluating safety conditions based on the level of service and other selected characteristics at two-way stop-controlled, unsignalized intersections.

Author : Elena S. Prassas
Publisher : Springer Nature
Page : 395 pages
File Size : 33,49 MB
Release : 2020-01-08
Category : Technology & Engineering
ISBN : 3030344800

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Since 1950, the Highway Capacity Manual has been a standard used in the planning, design, analysis, and operation of virtually any highway traffic facility in the United States. It has also been widely used around the globe and has inspired the development of similar manuals in other countries. This book is Volume II of a series on the conceptual and research origins of the methodologies found in the Highway Capacity Manual. It focuses on the most complex points in a traffic system: signalized and unsignalized intersections, and the concepts and methodologies developed over the years to model their operations. It also includes an overview of the fundamental concepts of capacity and level of service, particularly as applied to intersections. The historical roots of the manual and its contents are important to understanding current methodologies, and improving them in the future. As such, this book is a valuable resource for current and future users of the Highway Capacity Manual, as well as researchers and developers involved in advancing the state-of-the-art in the field.