00457413

Component

http://onlinepubs.trb.org...ate-of-the-art/2/2-037.pdf

The purpose of this paper was to demonstrate a method for evaluating and testing signal preemption strategies for LRT movements in existing arterial medians. Three operational options were identified and the probability expressions for a selected option were documented. Webster's delay model was adopted to estimate the average delay per vehicle per approach. The model was tested using a set of hypothetical demand parameters. The results of the model testing proved that the model parameters consistently produce reasonable results and that the model is sensitive to variations in main-arterial and cross-street volumes. Furthermore, it was concluded that, for the two-phase signal plan (Option 0), the overall intersection gain due to signal preemption is linearly proportional to LRT volume, and that there was no impact of advance detection duration on intersection gain. For the three-phase signal plan with a separate LRT phase (Option 1), no intersection gain was observed for almost all main-arterial volume levels. For the three-phase signal with an exclusive left-turn phase (Option 2), it was found that there exists an optimum main-arterial volume at which the overall intersection gain is maximum for a given constant left-turn volume. Finally, boundary lines of the control warrant regions for Options 0 and 2 were developed. (Author)

This paper appeared in Transportation Research Board State-of-the-Art Report 2, Light Rail Transit: System Design for Cost-Effectiveness. Presented at the Conference on Light Rail Transit held May 8-10, 1985, Pittsburgh, Pennsylvania. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.

01419095

p. 234-240

1985

State-of-the-Art Report

Conference on Light Rail Transit

0309039177

Digital/other

Figures (9) ; References (8) ; Tables (1)

Accuracy; Intersections; Light rail transit; Light rail transit grade crossings; Mathematical models; Traffic control; Traffic delays; Traffic engineers; Traffic simulation; Warrants (Traffic control devices)

Highways; Operations and Traffic Management; Planning and Forecasting; Public Transportation; Terminals and Facilities; I73: Traffic Control

TRIS, TRB

Jul 31 1986 12:00AM

• APPLICATION OF TRANSIT OPERATING COST MODELS
• CHANGES IN DIRECTION FOR LRT PLANNING IN EDMONTON
• COMPARISON OF LIGHT RAIL TRANSIT AND DUAL-MODE BUS SYSTEM
• CONSIDERATIONS FOR EFFECTIVE LIGHT RAIL STREET OPERATION
• COST-EFFECTIVE APPLICATION OF LRT SYSTEMS TECHNOLOGY
• CURRENT LIGHT RAIL DEVELOPMENTS IN NORTH AMERICA
• DESIGN OF LIGHT RAIL TRANSIT CATENARY SYSTEMS THAT ENCOURAGE UNIVERSAL CONTRACTOR PARTICIPATION
• DESIGN OF TRAFFIC INTERFACE ON THE BANFIELD LIGHT RAIL PROJECT
• DETERMINING COST-EFFECTIVENESS OF TRANSIT SYSTEMS
• DEVELOPMENT OF A RAIL TRANSIT PLAN AND IMPLEMENTATION STRATEGY FOR LOS ANGELES COUNTY
• DEVELOPMENT OF RIGHT-OF-WAY DESIGN AND STRATEGY INCORPORATING PUBLIC INPUT FOR THE BANFIELD EAST BURNSIDE CORRIDOR
• ECONOMIC RATING AND SPACING OF LRT TRACTION SUBSTATIONS
• ENERGY COST CONSIDERATIONS IN LIGHT RAIL VEHICLE SIZE SPECIFICATION
• ENERGY LOSS CONSIDERATIONS IN TRACTION POWER SUBSTATION DESIGN
• EVALUATION OF LIGHT RAIL TRANSIT FOR AUSTIN, TEXAS
• GETTING THE MOST ON A MODEST BUDGET--SANTA CLARA COUNTY TRANSIT DISTRICT LRV MAINTENANCE FACILITY
• IMPROVING LIGHT RAIL TRANSIT PERFORMANCE IN STREET OPERATIONS: TORONTO CASE STUDY
• INTEGRATING LRT INTO FLEXIBLE TRAFFIC CONTROL SYSTEMS
• INTEGRATION OF SACRAMENTO LIGHT RAIL TRANSIT SYSTEM INTO THE CENTRAL CITY
• KEY INTERFACES IN THE DESIGN OF TRACTION ELECTRIFICATION SYSTEMS FOR LIGHT RAIL TRANSIT
• LIGHT RAIL DEVELOPMENT IN LOS ANGELES
• LIGHT RAIL TRANSIT: SYSTEM DESIGN FOR COST-EFFECTIVENESS. FOREWORD
• LIGHT RAIL: PROSPECTS AND PERSPECTIVES
• LRT ON-STREET OPERATIONS: THE CALGARY EXPERIENCE
• MAIN FEATURES OF CLEVELAND'S LRV
• MARKET FOR LIGHT RAIL CARS IN THE UNITED STATES
• OVERVIEW OF MICROPROCESSOR-BASED CONTROLS IN TRANSIT AND CONCERNS ABOUT THEIR INTRODUCTION
• PORTLAND LRV
• REALITIES OF CONSTRUCTING LRT IN CITY STREETS
• RESUSCITATING AN OLD TROLLEY SYSTEM
• SELF-SERVICE FARE COLLECTION SYSTEMS FOR LRT: STATE-OF-THE-ART REVIEW
• SMALLER SCALE JOINT DEVELOPMENT: SAN DIEGO TROLLEY
• SPECIFICS OF LIGHT RAIL CAR DESIGN VERSUS RAPID CAR DESIGN
• UPGRADING CONVENTIONAL STREETCAR LINES TO LIGHT RAIL TRANSIT: CASE STUDY FROM OSLO, NORWAY
• VALUE ENGINEERING METHODS APPLIED TO A GUIDEWAY TRANSIT SYSTEM PROPOSED FOR ORANGE COUNTY, CALIFORNIA
• VALUE OF LIGHT RAIL TRANSIT AS A MAJOR CAPITAL INVESTMENT