Traffic Delays At Signalised Intersections
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Traffic Delays At Signalised Intersections
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Author : A. C. Sarna
language : en
Publisher:
Release Date : 1969
Traffic Delays At Signalised Intersections written by A. C. Sarna and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1969 with Roads categories.
Effects Of The Quality Of Traffic Signal Progression On Delay
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Author : Daniel B. Fambro
language : en
Publisher: Transportation Research Board
Release Date : 1991
Effects Of The Quality Of Traffic Signal Progression On Delay written by Daniel B. Fambro and has been published by Transportation Research Board this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Technology & Engineering categories.
Operation Analysis And Design Of Signalized Intersections
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Author : Michael Kyte
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2014-07-04
Operation Analysis And Design Of Signalized Intersections written by Michael Kyte and has been published by Createspace Independent Publishing Platform this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-07-04 with Roads categories.
Before they begin their university studies, most students have experience with traffic signals, as drivers, pedestrians and bicycle riders. One of the tasks of the introductory course in transportation engineering is to portray the traffic signal control system in a way that connects with these experiences. The challenge is to reveal the system in a simple enough way to allow the student "in the door," but to include enough complexity so that this process of learning about signalized intersections is both challenging and rewarding. We have approached the process of developing this module with the following guidelines: * Focusing on the automobile user and pretimed signal operation allows the student to learn about fundamental principles of a signalized intersection, while laying the foundation for future courses that address other users (pedestrians, bicycle riders, public transit operators) and more advanced traffic control schemes such as actuated control, coordinated signal systems, and adaptive control. * Queuing models are presented as a way of learning about the fundamentals of traffic flow at a signalized intersection. A graphical approach is taken so that students can see how flow profile diagrams, cumulative vehicle diagrams, and queue accumulation polygons are powerful representations of the operation and performance of a signalized intersection. * Only those equations that students can apply with some degree of understanding are presented. For example, the uniform delay equation is developed and used as a means of representing intersection performance. However, the second and third terms of the Highway Capacity Manual delay equation are not included, as students will have no basis for understanding the foundation of these terms. * Learning objectives are clearly stated at the beginning of each section so that the student knows what is to come. At the end of each section, the learning objectives are reiterated along with a set of concepts that students should understand once they complete the work in the section. * Over 70 figures are included in the module. We believe that graphically illustrating basic concepts is an important way for students to learn, particularly for queuing model concepts and the development of the change and clearance timing intervals. * Over 50 computational problems and two field exercises are provided to give students the chance to test their understanding of the material. The sequence in which concepts are presented in this module, and the way in which more complex ideas build on the more fundamental ones, was based on our study of student learning in the introductory course. The development of each concept leads to an element in the culminating activity: the design and evaluation of a signal timing plan in section 9. For example, to complete step 1 of the design process, the student must learn about the sequencing and control of movements, presented in section 3 of this module. But to determine split times, step 6 of the design process, four concepts must be learned including flow (section 2), sequencing and control of movements (section 3), sufficiency of capacity (section 6), and cycle length and splits (section 8). Depending on the pace desired by the instructor, this material can be covered in 9 to 12 class periods.
Impact Of Using Indirect Left Turns On Signalized Intersections
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Author : Mahmoud Ahmed Taha
language : en
Publisher:
Release Date : 2015
Impact Of Using Indirect Left Turns On Signalized Intersections written by Mahmoud Ahmed Taha and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with Dissertations, Academic categories.
"Most developing areas are suffering from traffic congestion problems. The majority of traffic delays in urban areas occur at traffic signals. Over the past few decades, several transportation agencies have been applying geometric changes, through adding more lanes, to signalized intersections in an effort to reduce delays. Because of the limited availability of right-of-way, many transportation agencies have started using unconventional traffic control systems for intersections to improve signal efficiency and reduce overall delays. Common unconventional left-turn control types such as the right-turn followed by a U-turn (RTUT) and a U-turn followed by a right-turn (UTRT) basically eliminate direct left-turn (DLT) movements at the intersection by rerouting left-turning vehicles away from the main junction. Following any of these alternatives reduces the number of phases and the average delay per vehicle at the main junction. However, it adds some additional travel time for left-turning vehicles and some delays at the U-turn locations. This thesis presents a parametric study to evaluate the impact of replacing direct left-turns with U-turns (either RTUT or UTRT). The main goal of this study is to determine the traffic operational performance of each alternative under different traffic conditions. Traffic signal evaluation (Synchro) and simulation (Vissim) tools were utilized in this study to determine the optimized signal timings and evaluate intersection performance for each left-turn control type, respectively. Many parameters were considered, such as the total traffic volume on the intersection, the percentage of vehicles on each approach, the turning percentage for each movement, and the U-turn locations. It was concluded that unconventional left-turn control types have less delay and travel time compared to the DLT, when the U-turn locations are 200 meters away from the main intersection. Also, the right-turn followed by a U-turn showed superior performance over the other left-turn control types, when the U-turn locations are 100 meters away from the main intersection. Furthermore, it is not recommended to have the U-turns at a distance less than 100 meters when using unconventional left-turn control types because of the queue spillback effect. Finally, both conventional and unconventional control types have comparable vehicle kilometers travelled (VKT)."--Abstract.
Improved Criteria For Traffic Signals At Individual Intersections
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Author : Planning Research Corporation
language : en
Publisher:
Release Date : 1964
Improved Criteria For Traffic Signals At Individual Intersections written by Planning Research Corporation and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1964 with Transportation categories.
A preliminary examination of existing traffic signals was conducted on simple intersections of four lanes crossing four lanes. The research tasks performed were 1. review of prior research, 2. formulation of a preliminary model, 3. testing and refining the model, and 4. examination of controllers and control techniques. A comprehensive bibliography was assembled and studied.
Development Of A Modeling Approach To Analyze Intersection Traffic Delay Under The Control Of A Real Time Adaptive Traffic Signal System
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Author : Paul Brian Wolshon
language : en
Publisher:
Release Date : 1997
Development Of A Modeling Approach To Analyze Intersection Traffic Delay Under The Control Of A Real Time Adaptive Traffic Signal System written by Paul Brian Wolshon and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Electronic traffic controls categories.
Design And Performance Characteristics Of Signalised Intersections
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Author : A. C. Sarna
language : en
Publisher:
Release Date : 1972
Design And Performance Characteristics Of Signalised Intersections written by A. C. Sarna and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1972 with Roads categories.
Optimum Time Intervals For The Traffic Signal Re Timing Process
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Author : Radha Krishna Swayampakala
language : en
Publisher:
Release Date : 2004
Optimum Time Intervals For The Traffic Signal Re Timing Process written by Radha Krishna Swayampakala and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
One of the most growing concerns in urban areas is the excessive traffic congestion and delay at signalized intersections. Transportation agencies are now faced with ever increasing demands to find quick and permanent solutions to these problems. Reviewing signal timing for adequacy and re-timing the signal plans at frequent intervals can help solve them. Traffic signal optimization is found to be the most cost-effective way to reduce congestion, stops, delays, and fuel consumption. Although research to date clearly presented the benefits of traffic signal optimization, it has failed to address a key issue: the timeframe required for signal re-timing. This study is aimed at determining the optimum timeframe required for signal re-timing, which would account for both the financial costs of re-timing and the economic loss incurred due to traffic delays. Several signalized intersections with varying volumes and characteristics in different cities of North Carolina were selected and the data required for the signal analysis was collected. Using SYNCHRO, signal delays were estimated at all the intersections for time periods of five to seven years, for both the existing and optimized timing plans. A comparative study based on the analysis concluded that re-timing the signals at intervals of 24-30 months would provide the maximum benefits in terms of signal delay as well as the re-timing costs.
Estimation Of Delay And Queue Length At Non Signalized Intersections
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Author : Mario R. Duran
language : en
Publisher:
Release Date : 1986
Estimation Of Delay And Queue Length At Non Signalized Intersections written by Mario R. Duran and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with NETSIM (Computer program) categories.
Modeling Of Delay Induced By Downstream Traffic Disturbances At Signalized Intersection
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Author : Kamran Ahmed
language : en
Publisher:
Release Date : 2006
Modeling Of Delay Induced By Downstream Traffic Disturbances At Signalized Intersection written by Kamran Ahmed and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Roads categories.