Development of Advance Warning Systems for End-of-green Phase at High Speed Traffic Signals
Author:
Publisher:
Published: 2004
Total Pages: 84
ISBN-13:
DOWNLOAD EBOOKRead and Download eBook Full
Author:
Publisher:
Published: 2004
Total Pages: 84
ISBN-13:
DOWNLOAD EBOOKAuthor: Carroll J. Messer
Publisher:
Published: 2003
Total Pages: 44
ISBN-13:
DOWNLOAD EBOOKAuthor:
Publisher:
Published: 2003
Total Pages: 48
ISBN-13:
DOWNLOAD EBOOKThis report describes the research conducted within a two-year study that developed an effective advance warning for end-of-green phase at high-speed traffic signals in Texas. The Advance Warning of End-of-Green System (AWEGS) was developed in this research by the Texas Transportation Institute for the Texas Department of Transportation. AWEGS was deployed at two locations, one on a two-lane highway in Waco, Texas, and another on a four-lane highway in Brenham, Texas. This report describes the installation and maintenance procedures for operating AWEGS.
Author: Peter T. Martin
Publisher:
Published: 2003
Total Pages: 64
ISBN-13:
DOWNLOAD EBOOKAuthor: Li Zhao
Publisher:
Published: 2016
Total Pages: 122
ISBN-13:
DOWNLOAD EBOOK"The Advance Warning System (AWS), developed by the Nebraska Department of Roads (NDOR) has proven to be effective at improving traffic safety at isolated signalized intersections. However, the effectiveness of the system has not been analyzed at signalized intersections operating in a coordinated mode. This project analyzed AWS on arterials where the signals operate in a coordinated mode. The test bed consisted of nine sites, which were located at five successive coordinated signalized intersections on Highway 281 in Grand Island, Nebraska. A non-intrusive data collection system was used to collect a continuous traffic stream of data up to 1200 ft upstream of the stop-line at a given intersection. ... The overall results suggested that: 1) the AWS was effective at alerting drivers to the impending end of the green signal, and 2) the impacted driver, for the most part, slowed down when the AWS was activated" (page ix).
Author: U.s. Department of Transportation
Publisher: CreateSpace
Published: 2015-02-20
Total Pages: 286
ISBN-13: 9781508557173
DOWNLOAD EBOOKThis 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.
Author: Ronald W. Eck
Publisher:
Published: 1984
Total Pages: 202
ISBN-13:
DOWNLOAD EBOOKAdvance warning including flashing signs and strobe lights. Survey of traffic engineers at state and local agencies.
Author: Aaron Paul Jensen
Publisher:
Published: 2007
Total Pages: 120
ISBN-13:
DOWNLOAD EBOOKAdvance warning signals (AWS) provide information warning drivers in advance of the end-of-green phase for an approaching signalized intersection. The purpose of this research was to develop guidelines for the placement of AWS in Utah, both conditions to evaluate the need for AWS installation and guidelines for the AWS system design. The conditions were based on literature of other transportation agencies that had similar AWS systems and were developed using the Policy Delphi method. The Policy Delphi method is the development of a specific policy area through the means of discussion by a committee of experts correlating views and information involving opportunity to react and assess different viewpoints until the committee is in agreement over the policies being recommended. Six conditions are recommended and discussed in detail, including: limited sight distance, posted speed, isolated intersection, high crash rate, approach grade, and heavy vehicle traffic volume. The guidelines for the AWS system design included details about three components: AWS component, advance detection component, and signal timing component. An evaluation matrix was developed by the Policy Delphi method for the purpose of evaluating and prioritizing a group of intersections for AWS installation. A total of 24 intersections were identified by the Utah Department of Transportation for this project that helped to develop and verify the conditions and evaluation matrix. The recommended guidelines and evaluation matrix results are described.
Author:
Publisher:
Published: 2010
Total Pages: 136
ISBN-13:
DOWNLOAD EBOOKThis 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.
Author: Henry Liu
Publisher:
Published: 2009
Total Pages: 76
ISBN-13:
DOWNLOAD EBOOKMost of the rural or suburban high-speed isolated intersections have higher traffic volumes on the major approach compared to the minor approach. The vehicle platoons on major approach are often forced to stop frequently due to conflicting calls placed by few vehicles on the minor approach. To overcome this issue, platoon-priority signal control systems have been developed to progress platoons efficiently at these intersections in a number of previous studies. In addition, Advance Warning Flashers (AWF) are used at these intersections to provide advance warning of end of green to the motorists. The conventional method uses trailing overlap green which holds the green for a fixed time after gap-out. This trailing overlap green replaces the existing dilemma-zone protection provided by loop detectors and also increases delay on the minor approach. Recently, Advance Warning of End of Green System (AWEGS) has been developed to provide advance warning at these intersections without having to hold green after gap-out. The purpose of this research study is to develop and evaluate the benefits of an integrated system which provides platoon-priority, advance warning of end-of-green, and also dilemma-zone protection at the end-of-green for rural high-speed isolated intersections. Cabinet-in the-loop tests were performed using a real world scenario. These study results showed 50 percent reduction in delay and stops on the major approach with platoons. It was found that the total intersection delay and stops were reduced by as much as 20 percent. The system was also successful in providing advance warning to the motorists by predicting gap-outs 7 to 8 seconds earlier in the majority of the cases.