Analysis of Off-peak Traffic Signal Operations
Analysis of Off-peak Traffic Signal Operations

Author: Anuar Amanzholov

Publisher: ProQuest

Published: 2008

Total Pages:

ISBN-13: 9780549813880

DOWNLOAD EBOOK

A traffic signal plays a major role in the overall safety and efficiency of traffic operations at an intersection. The type of operation strategy and signal timings utilized are typically based on the designed operation of the intersection at a desired Level of Service during peak traffic conditions. However, during off-peak traffic periods, the same strategy could cause extensive vehicle delay when much lower traffic volumes are present. The main objective of the study is to define the existing off-peak issues and propose solutions to mitigate problems. This study describes various off-peak period issues and includes reviews of modern traffic signal control systems. It also entails an evaluation of different traffic signal operation strategies which can be deployed to mitigate the off-peak issues. This study also covers flashing signal controls and adaptive control systems. Another objective is to perform a computer simulation which is included to extend the scope of the research. The results showed that upgrades and optimization of traffic signal controls can be an efficient way to decrease number of stops, gas consumption and vehicle emissions. The results of the study showed that actuated traffic signal controls are the best solution for low traffic volume periods. Implementation of actuated traffic controls can decrease overall delay, number of stops, gas consumption and vehicle emissions.

Traffic Signal Timing Manual
Traffic Signal Timing Manual

Author: U.s. Department of Transportation

Publisher: CreateSpace

Published: 2015-02-20

Total Pages: 286

ISBN-13: 9781508557173

DOWNLOAD EBOOK

This report serves as a comprehensive guide to traffic signal timing and documents the tasks completed in association with its development. The focus of this document is on traffic signal control principles, practices, and procedures. It describes the relationship between traffic signal timing and transportation policy and addresses maintenance and operations of traffic signals. It represents a synthesis of traffic signal timing concepts and their application and focuses on the use of detection, related timing parameters, and resulting effects to users at the intersection. It discusses advanced topics briefly to raise awareness related to their use and application. The purpose of the Signal Timing Manual is to provide direction and guidance to managers, supervisors, and practitioners based on sound practice to proactively and comprehensively improve signal timing. The outcome of properly training staff and proactively operating and maintaining traffic signals is signal timing that reduces congestion and fuel consumption ultimately improving our quality of life and the air we breathe. This manual provides an easy-to-use concise, practical and modular guide on signal timing. The elements of signal timing from policy and funding considerations to timing plan development, assessment, and maintenance are covered in the manual. The manual is the culmination of research into practices across North America and serves as a reference for a range of practitioners, from those involved in the day to day management, operation and maintenance of traffic signals to those that plan, design, operate and maintain these systems.

Simulation of Flashing Signal Operations
Simulation of Flashing Signal Operations

Author: Luis E. Moreno

Publisher:

Published: 1982

Total Pages: 56

ISBN-13:

DOWNLOAD EBOOK

Various guidelines that have been proposed for the operation of traffic signals in the flashing mode were reviewed. The use of existing traffic simulation procedures to evaluate flashing signals was examined and a study methodology for simulating and evaluating potential flashing signal schemes was developed. A case study is described in which the performance of existing signal settings versus flashing signal strategies was tested for different levels of main street and side street traffic volumes. The study showed that the main street flow improves with flashing signals in its favor under all circumstances, while increased volumes typically create longer delays at the side street. Major and side street traffic volumes are recommended as the focus of guidelines for using flashing signals during peak flow periods.

Observation and Modeling of Traffic Operations at Intersections in Malfunction Flash Mode
Observation and Modeling of Traffic Operations at Intersections in Malfunction Flash Mode

Author: Peter M. Jenior

Publisher:

Published: 2007

Total Pages:

ISBN-13:

DOWNLOAD EBOOK

When a traffic signals malfunction monitoring unit detects a problem with a traffic signal such as the simultaneous display of green indications to conflicting movements or loss of power to some signal heads, the signal is automatically placed into flash mode as a safety precaution. Signals can have either red/red malfunction flash mode or yellow/red malfunction flash mode, and the mode cannot change by time of day or day of week. This study analyzed traffic operation at 34 instances of yellow/red malfunction flash and 9 instances of red/red malfunction flash in the Atlanta, Georgia area. Many of these instances were during high volume periods. A high level of driver confusion exists at malfunction flash intersections. The rate at which through major street drivers (i.e. those facing a flashing yellow signal) stopped exceeded 75 percent at some yellow/red flash intersections. This creates a safety hazard for other major street drivers who are not expecting vehicles to stop, and for minor street drivers who cannot tell what type of control is being presented to cross traffic or do not understand that vehicles are not required to stop when approaching a flashing yellow indication. Furthermore, high stopping rates at a flashing yellow signal eliminate many of the operational benefits that yellow/red flash is assumed to have over red/red flash. Based on the findings of this study, the use of red/red flash should be the primary flash mode and possibly used exclusively. Requiring all vehicles to stop will improve safety conditions and not have large operational impacts at intersections where a majority of major street vehicles are already stopping at a flashing yellow signal. Yellow/red flash may be an acceptable malfunction flash mode at the intersection of a very large street and a very small street, but additional measures would be required at these intersections to address potential driver confusion.

Masters Theses in the Pure and Applied Sciences
Masters Theses in the Pure and Applied Sciences

Author: Wade H. Shafer

Publisher: Springer Science & Business Media

Published: 2012-12-06

Total Pages: 426

ISBN-13: 1461519691

DOWNLOAD EBOOK

Masters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS)* at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dis semination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all concerned if the printing and distribution of the volumes were handled by an international publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Corporation of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 38 (thesis year 1993) a total of 13,787 thesis titles from 22 Canadian and 164 United States universities. We are sure that this broader base for these titles reported will greatly enhance the value of this impor tant annual reference work. While Volume 38 reports theses submitted in 1993, on occasion, certain uni versities do report theses submitted in previous years but not reported at the time.