Simulation of Flashing Signal Operations

Simulation of Flashing Signal Operations

Author: Luis E. Moreno

Publisher:

Published: 1982

Total Pages: 56

ISBN-13:

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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.


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

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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.


Safety Evaluation of Discontinuing Late-night Flash Operations at Signalized Intersections

Safety Evaluation of Discontinuing Late-night Flash Operations at Signalized Intersections

Author:

Publisher:

Published: 2013

Total Pages: 0

ISBN-13:

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Late-night flash (LNF) mode at signalized intersections consists of traffic signals that flash yellow for one road (requiring drivers to show caution but not stop) and flash red for the other road (requiring drivers to stop, then proceed after yielding to the main road). Although the intent of this mode has been to reduce energy consumption and delay during periods of low traffic demand, safety concerns have caused agencies to begin replacing LNF with normal phasing operations. Studies of the safety impacts of replacing LNF with normal phasing operations have indicated that doing so will reduce night crashes; however, a limitation of many studies is a potential bias due to regression to the mean (RTM). In this article, the authors examine the effect of eliminating LNF operations at signalized intersections using state-of-the-art methods and to address the noted limitations. The authors aimed to include an adequate sample of locations for which traffic volume data were available.