Evaluation Of Advance Warning Signals On High Speed Signalized Intersections
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Evaluation Of Advance Warning Signals On High Speed Signalized Intersections
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Author : Peter T. Martin
language : en
Publisher:
Release Date : 2003
Evaluation Of Advance Warning Signals On High Speed Signalized Intersections written by Peter T. Martin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Electronic traffic controls categories.
Evaluation Of High Speed Isolated Signalized Intersections In California
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Author : Simon Washington
language : en
Publisher:
Release Date : 1991
Evaluation Of High Speed Isolated Signalized Intersections In California written by Simon Washington and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Electronic traffic controls categories.
High-speed isolated signalized intersections (HSISI's) are generally encountered after long uninterrupted and uncongested flow conditions, thereby catching some motorists by surprise. For this reason alone, approaches to HSISI's need to have safe and effective warning, control, and intersection geometric treatments. This research identified characteristics at California HSISI's that relate to accident rates. A data base consisting of approximately 100 intersection and approach variables was established and used to investigate advance warning, signal timing and phasing, channelization, signal equipment configurations, shoulder widths and types, median widths and types, and approach speeds.
Evaluation Of Detection And Signing Systems For High Speed Signalized Intersections
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Author : Prahlad D. Pant
language : en
Publisher:
Release Date : 1996
Evaluation Of Detection And Signing Systems For High Speed Signalized Intersections written by Prahlad D. Pant and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Electronic traffic controls categories.
The effects of two dynamic signs that begin to flash a few seconds before the onset of the yellow interval and a static sign that flashes all the time were examined at tangent and curved approaches to rural, high speed signalized intersections. The dynamic signs included (a) a PTSWF (prepare to stop when flashing) sign, and (b) a FSSA (flashing symbolic signal ahead) sign with green, yellow, and red circles. The static sign was a CFSSA (continuously flashing symbolic signal ahead) sign with the three circles. The effects of these signs on vehicular speeds at different segments of the intersection approach including the dilemma zone were analyzed as were the vehicle conflict rates and the responses from the drivers' surveys.
In Service Evaluation Of A Detection Control System For High Speed Signalized Intersections
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Author : Karl Zimmerman
language : en
Publisher:
Release Date : 2005
In Service Evaluation Of A Detection Control System For High Speed Signalized Intersections written by Karl Zimmerman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Electronic traffic controls categories.
Traffic engineers are often faced with operational and safety challenges at rural, high-speed signalized intersections. Vehicle-actuated control, combined with multiple advance detectors, is often used to improve operations and safety. However, this type of detection and control has not always resulted in a significant number of crashes. Crashes sometimes continue to occur at high-speed intersections, and delays to traffic movements can be unnecessarily long. An innovative detection-control system was developed for the Texas Department of Transportation to minimize both delay and crash frequency at rural intersections. This system was subsequently implemented at several intersections in Texas and its safety and operational benefits were evaluated. This report documents the findings and conclusions reached as a result of a three-year implementation project. The Detection-Control System was installed at each of eight intersections in Texas during the three-year period. Five of the intersections were suitable for a before-after study of safety and operational data. An evaluation of the before-after data indicated that the Detection-Control System was able to reduce delay by 14 percent, stop frequency by 9 percent, red-light violations by 58 percent, heavy-vehicle red-light violations by 80 percent, and severe crash frequency by 39 percent.
Evaluation Of Detector Placement For High Speed Approaches To Signalized Intersections
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Author : Dan R. Middleton
language : en
Publisher:
Release Date : 1997
Evaluation Of Detector Placement For High Speed Approaches To Signalized Intersections written by Dan R. Middleton and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Detectors categories.
Traffic Signal Systems 2009
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Author :
language : en
Publisher:
Release Date : 2009
Traffic Signal Systems 2009 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with Electronic traffic controls categories.
TRB's Transportation Research Record: Journal of the Transportation Research Board, No. 2128 includes 23 papers that explore green time at congested traffic signals, traffic signal maintenance and operations needs, railroad-preempted intersections, three dimensional mapping of inductive loop detector sensitivity, cycle length performance measures, bus priority strategies on arterials controlled by SCOOT, tolerances for magnetometer orientation and field calibration procedure, and optimization of coordinated-actuated traffic signal system. This issue of the TRR also examines bicyclist intersection crossing times, left-turn signal control, optimizing traffic control to reduce fuel consumption and exhaust emissions, optimizing signal timings from the field, platoon-priority and advance warning flasher system at high-speed intersections, prediction of red light running, microscopic modeling of traffic signal operations, lost time and cycle length for an actuated traffic signal, specifying vehicle detection performance, local synchronization control scheme for congested interchange areas, distributed Ethernet network of advanced pedestrian signals, comparison of before-after versus off-on adaptive traffic control evaluations, generating traffic scenarios for large arterial networks, evaluating green-extension policies, and safety evaluation for intergreen intervals at signalized intersections.
Advance Detection On High Speed Signalized Intersection Approaches
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Author : Patrick T. McCoy
language : en
Publisher:
Release Date : 2002
Advance Detection On High Speed Signalized Intersection Approaches written by Patrick T. McCoy and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Electronic traffic controls categories.
Development Of Advance Warning Systems For End Of Green Phase At High Speed Traffic Signals
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Author :
language : en
Publisher:
Release Date : 2004
Development Of Advance Warning Systems For End Of Green Phase At High Speed Traffic Signals written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Traffic signs and signals 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.
Dilemma Zone Protection And Signal Coordination At Closely Spaced High Speed Intersections
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Author : Prahlad D. Pant
language : en
Publisher:
Release Date : 2001
Dilemma Zone Protection And Signal Coordination At Closely Spaced High Speed Intersections written by Prahlad D. Pant and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Electronic traffic controls categories.
A feasibility study of dilemma zone problems, performed by collecting and analyzing traffic flow data at a high-speed signalized intersection, showed that the maximum green extension or cutback needed to get a vehicle out of the dilemma zone is generally no more than 2 seconds. If we scan all vehicles on a link just a few seconds before the beginning of a yellow interval, we may be able to extend or cut back the green interval so that the vehicles can avoid the dilemma zone. For each vehicle approaching an intersection on the link that is about to turn yellow, there is a time interval such that (a) the vehicle will be in the dilemma zone without green extension (or cutback) or (b) it will be in the dilemma zone when there are T seconds of extension (or cutback). So the task is to find the smallest nonnegative integer T that is not in any of these time intervals and extend (or cut back) the current interval by T seconds. This T can always be found and assuming there are no other restrictions, dilemma zones can be avoided and the extension (or cutback) is done at most once for each green interval. The simulation study, performed by modifying the source codes of NETSIM, showed that the signal timing generated by a bandwidth maximization program (PASSER-II) resulted in a lower number of vehicles in the dilemma zone than that generated by a delay minimization program (TRANSYT-7F). Additionally, the signal timing generated by the combination of the two programs, that is, by minimizing delay within the constraint of bandwidth maximization, resulted in an even lower number of vehicles in the dilemma zone than those generated by each program alone. The technique developed in this study can be implemented if the speeds and positions of all vehicles on the roadway can be recorded at small time intervals (e.g., 1 sec). Recommendations are made for implementing and testing the developed technique.