Dilemma Zone Protection And Signal Coordination At Closely Spaced High Speed Intersections

DOWNLOAD

Download Dilemma Zone Protection And Signal Coordination At Closely Spaced High Speed Intersections PDF/ePub or read online books in Mobi eBooks. Click Download or Read Online button to get Dilemma Zone Protection And Signal Coordination At Closely Spaced High Speed Intersections book now. This website allows unlimited access to, at the time of writing, more than 1.5 million titles, including hundreds of thousands of titles in various foreign languages. If the content not found or just blank you must refresh this page

Dilemma Zone Protection And Signal Coordination At Closely Spaced High Speed Intersections

DOWNLOAD
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.

Field Testing And Implementation Of Dilemma Zone Protection And Signal Coordination At Closely Spaced High Speed Intersections

DOWNLOAD
Author :
language : en
Publisher:
Release Date : 2005

Field Testing And Implementation Of Dilemma Zone Protection And Signal Coordination At Closely Spaced High Speed Intersections written by 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.

Historically, high speed signalized intersections have reported many crashes and have always posed a challenge to traffic engineers for enhancing safety at these intersections. The area close to the intersection, called the dilemma zone, poses a high accident potential for the driver in stopping safely during the yellow interval or in proceeding through the intersection before the beginning of red. The driver is in a potentially hazardous situation whereby, if he tries to cross the intersection at the onset of red interval, he may end up in an angle accident with the cross street traffic or if he accelerates through yellow, he may end up in a rear-end collision. The uncertain situation in a dilemma zone can potentially lead to rear-end or right angle collisions.

Human Factors Guidelines For Road Systems

DOWNLOAD
Author : John L. Campbell
language : en
Publisher: Transportation Research Board
Release Date : 2012

Human Factors Guidelines For Road Systems written by John L. Campbell 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 2012 with Technology & Engineering categories.

"This report completes and updates the first edition of NCHRP Report 600: Human Factors Guidelines for Road Systems (HFG), which was published previously in three collections. The HFG contains guidelines that provide human factors principles and findings for consideration by, and is a resource document for, highway designers, traffic engineers, and other safety practitioners."--Foreword.

Dilemma Zone Protection And Signal Coordination At Closely Spaced High Speed Intersections

DOWNLOAD
Author : Prahlad D. Pant
language : en
Publisher:
Release Date : 2006

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 2006 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 two seconds. Scanning all vehicles on a link just seconds before the beginning of a yellow interval may extend or cut back the green interval so that vehicles can avoid the dilemma zone. For each vehicle approaching an intersection on a link about to turn yellow there is a time interval that (a) the vehicle will be in dilemma zone without green extension (or cutback) or (b) it will be in dilemma zone when there is T seconds of extension (or cutback). The task becomes to find the smallest nonnegative integer T that is not in any of these time intervals and extend or cutback 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 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 even lower number of vehicles in 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 in the roadway can be recorded at small time intervals (e.g., 1 sec.). Recommendations are made for implementing and testing the developed technique.

Progress In Location Based Services 2014

DOWNLOAD
Author : Georg Gartner
language : en
Publisher: Springer
Release Date : 2014-11-05

Progress In Location Based Services 2014 written by Georg Gartner and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-11-05 with Science categories.

This book presents a general picture of recent research activities related to location-based services. Such activities emerged in the last years especially concerning issues of outdoor/indoor positioning, smart environment, spatial modelling, personalization and context-awareness, cartographic communication, novel user interfaces, crowdsourcing, social media, big data analysis, usability and privacy. This book is comprised of a selection of the best papers presented during the 11th International Symposium on Location Based Services, which was held in Vienna (Austria) between 26th and 28th November 2014.

Placement Of Detection Loops On High Speed Approaches To Traffic Signals

DOWNLOAD
Author :
language : en
Publisher:
Release Date : 2010

Placement Of Detection Loops On High Speed Approaches To 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 2010 with Detectors categories.

This report contains the results of the NC Department of Transportation research project Placement of Detection Loops on High Speed Approaches to Traffic Signals (HWY 2007-13). The goal of this project was to determine the best places to locate detectors on the approaches to high-speed signalized intersections and the best signal control strategy to employ in conjunction with those sensor placement ideas to minimize dilemma zone occurrences.

Report

DOWNLOAD
Author :
language : en
Publisher:
Release Date : 1964

Report written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1964 with Highway research categories.

State Planning And Research Program

DOWNLOAD
Author :
language : en
Publisher:
Release Date : 1999

State Planning And Research Program written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Transportation categories.

Ohio Documents

DOWNLOAD
Author :
language : en
Publisher:
Release Date : 2001

Ohio Documents written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Government publications categories.

Operation Analysis And Design Of Signalized Intersections

DOWNLOAD
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.