Download or read book Investigating Track Clearance Time Requirements at Railroad preempted Traffic Signals Using Computer Simulation Models written by Brett Wheelock Blackadar and published by . This book was released on 1998 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Clearance Time Requirements at Railroad preempted Traffic Signals written by Gary Long and published by . This book was released on 2002 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Non vital Advance Rail Preemption of Signalized Intersections Near Highway rail Grade Crossings written by Leonard Ruback and published by . This book was released on 2004 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Texas Department of Transportation (TxDOT) primarily uses simultaneous preemption of traffic signals near highway-rail grade crossings to clear queued vehicles prior to the arrival of a train at the crossing. At some intersections, 20 seconds of advanced warning may not be sufficient to allow the traffic signal to clear pedestrians using the normal clearance intervals between phases. The research developed an alternative method (non-vital advance preemption) of ensuring adequate pedestrian clearance in the presence of an approaching train without interfering with the normal preemption sequence at the intersection or installing costly additional track circuitry needed to provide advance preemption. Two strategies were investigated to ensure pedestrian clearance time. The first utilizes a lower-level preemption sequence to guarantee full pedestrian clearance to a terminating phase before the traffic signal starts the preemption sequence. The second strategy uses the pedestrian-omit feature to prevent the controller from activating the pedestrian interval if there is not sufficient time in advance of the start of the preemption sequence to provide full pedestrian clearance.
Download or read book Guide for Traffic Signal Preemption Near Railroad Grade Crossing written by Steven P. Venglar and published by . This book was released on 2000 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Engineering Solutions to Improving Operations and Safety at Signalized Intersections Near Railroad Grade Crossings with Active Devices written by and published by . This book was released on 2005 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Preemption of Traffic Signals at Or Near Railroad Grade Crossings written by Institute of Transportation Engineers and published by . This book was released on 1979 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Preemption of Traffic Signals Near Railroad Grade Crossings written by Institute of Transportation Engineers. Traffic Engineering Council. Joint Rail Grade Crossing Committee and published by . This book was released on 2019 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Institute of Transportation Engineers (ITE) prepared this report to reflect the current state-of-the-practice and to provide the user with a broad overview of key considerations for the preemption of traffic signals near railroad grade crossings. Where a signalized intersection exists in close proximity to a railroad crossing and either queues from the intersection impact the crossing or queues from the crossing impact the intersection, the railroad signal control equipment and the highway traffic signal control equipment should be interconnected. The normal operation of the traffic signals controlling the intersection should be preempted to operate in a special control mode when trains are approaching. This proposed recommended practice was written primarily for an audience of engineers working for public agencies, railroads, and public transit agencies engaged in signal design and operational timing. The objective of this proposed revision is to include new information on the design and operation of traffic signal preemption that has been learned since the previous edition was published.
Download or read book Warning Time Requirements at Railroad highway Grade Crossings with Active Traffic Control written by and published by . This book was released on 1991 with total page 99 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research was conducted to assess the effects of warning time on driver behavior and safety at rail-highway grade crossings with active traffic control. Warning time is defined as the time between traffic control device activation and train arrival. As part of the research, detailed driver response data from two crossings with flashing light signals and one with gates and flashing light signals were analyzed. In addition, a laboratory assessment of drivers' warning time expectancies and tolerance levels at active crossings was conducted, and relevant warning time practices in six foreign countries were surveyed. The results of the studies and survey were used to develop suggested guidelines for minimum, maximum, and desirable warning times at grade crossings with active traffic control. A computer simulation model was also developed to predict the effects of excessive warning times on crossing violations and motorist delay.
Download or read book Preemption of Traffic Signals Near Railroad Grade Crossings written by Institute of Transportation Engineers. Traffic Engineering Council. Joint Rail Grade Crossing Committee and published by . This book was released on 2021 with total page 67 pages. Available in PDF, EPUB and Kindle. Book excerpt: ITE prepared this recommended practice to reflect the current state-of-the-practice and provide the user with a broad overview of key considerations for the preemption of traffic signals near railroad grade crossings. In these locations the railroad signal control equipment and the roadway traffic signal control equipment should be interconnected and normal operation of the traffic signals controlling the intersection should be preempted to operate in a special control mode when trains are approaching. The report is written primarily for an audience of engineers working for public agencies, railroads and public transit agencies engaged in signal design and operational timing.
Download or read book Preemption of Traffic Signals Near Railroad Crossings written by and published by Institute of Transportation Engineers. This book was released on 2006-01-01 with total page 47 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Analysis of Queue Characteristics at Signalized Intersections Near Highway railroad Grade Crossing written by Amna Chaudhry and published by . This book was released on 2015 with total page 151 pages. Available in PDF, EPUB and Kindle. Book excerpt: Analysis of traffic queues at signalized intersections which are in close proximity to highway-railroad grade crossings is of primary importance for determining if the normal signal operation needs to be preempted for railroad operations by providing a special signal mode for safe clearance of the queued vehicles from the tracks before the train arrival, and prohibiting any conflicting traffic movements towards the crossing. Such queuing analysis becomes even more critical where direct observations of traffic queues are not possible or where the assessment is needed for a future location. Inadequate estimation of queues from signalized intersections to the nearby railroad grade crossing can lead to severe safety issues. Underestimation of queue lengths may lead to an unsafe design while significantly overestimated queues may cause unnecessary traffic delays consequently leading to violations of the active traffic control devices at the crossing. In order to determine an adequate approach for reasonable estimation of queue lengths at signalized intersections near highway-railroad grade crossings, this dissertation first evaluated and compared different currently used microscopic simulation-based methods (i.e. Sim-Traffic and VISSIM) for their adequacy in estimating the queue lengths. After that several comparisons are made between the queue estimation from the simulation-based and other deterministic analytical methods including Highway Capacity Software, Synchro, and Railroad Assessment Tool. The comparisons drawn between each method helped identifying the differences and specific limitations of each method in including the impact of various important factors on the resulting queue estimation. The recommendations are provided on the basis of model capability to adequately count the impact of various significant traffic factors on queue estimation and considering minimizing the risk of underestimated queues. Based on the analysis findings, a microscopic simulation based procedure is developed using Sim-Traffic for estimating the 95th percentile queue lengths on various existing signalized intersection configurations near highway-rail grade crossings to help evaluate the need for signal preemption. In addition, recommendations are developed, if preemption is necessary, for determining queue clearance distance and minimum track clearance time. The recommended procedure is developed considering minimizing the risk of underestimated queues or unsafe design at such locations, and simplify the design and decision-making process.
Download or read book Preemption of Traffic Signals Near Railroad Crossings written by and published by . This book was released on 2003 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Traffic Signal Preemption at Intersections Near Highway rail Grade Crossings written by and published by . This book was released on 2017 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 507: Traffic Signal Preemption at Intersections Near Highway--Rail Grade Crossings documents the current practices of traffic signal preemption deployed at intersections adjacent to railway grade crossing in both the United States and Canada. The study provides information on practices dealing with traffic signal preemption, maintenance, funding, and operations.
Download or read book Light Rail Service written by Transit Cooperative Research Program and published by . This book was released on 2001 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report provides documentation and presents the results of a study to improve the safety of light rail transit (LRT) in semiexclusive rights-of-way where light rail vehicles operate at speeds greater than 35 mph through crossings with streets and pedestrians pathways. This report also presents the results of field tests conducted to improve the safety of higher speed LRT systems through grade crossing design.
Download or read book Traffic Signal Timing Manual written by U.s. Department of Transportation and published by CreateSpace. This book was released on 2015-02-20 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Roundabouts written by Lee August Rodegerdts and published by Transportation Research Board. This book was released on 2010 with total page 407 pages. Available in PDF, EPUB and Kindle. Book excerpt: TRB's National Cooperative Highway Research Program (NCHRP) Report 672: Roundabouts: An Informational Guide - Second Edition explores the planning, design, construction, maintenance, and operation of roundabouts. The report also addresses issues that may be useful in helping to explain the trade-offs associated with roundabouts. This report updates the U.S. Federal Highway Administration's Roundabouts: An Informational Guide, based on experience gained in the United States since that guide was published in 2000.
Download or read book Urban Mass Transportation Abstracts written by and published by . This book was released on 1982 with total page 940 pages. Available in PDF, EPUB and Kindle. Book excerpt:
