Evaluation of Traffic Operations at Diamond Interchanges Using Advanced Actuated Control PDF Download

Author: Peter John Vincent Koonce
Publisher:
ISBN:
Category :
Languages : en
Pages : 276

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Author: Carroll J. Messer
Publisher:
ISBN:
Category : Electronic traffic controls
Languages : en
Pages : 98

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Author: Peifeng Hu
Publisher:
ISBN:
Category : Electronic books
Languages : en
Pages : 510

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Book Description
This dissertation introduces three new methodologies to improve traffic signal operations of Diverging Diamond Interchanges (DDIs). Methodology one applies to a DDI without signals for left-turns from the freeway off-ramp. This methodology combines Webster's method and the specific characteristics of a DDI to determine traffic signal operation parameters such as cycle length, phasing splits, and phasing sequence. Comparing to methodology one, methodology two can handle more general and complex cases. Both methodologies can be implemented at a DDI by one traffic controller and operate successfully for a variety of controller types including pre-timed, fully actuated, and coordinated actuated control. Methodology three, also called proposed operation 3, combines Genetic Algorithm and a professional simulation tool such as VISSIM to search for the optimal operations for DDIs based on the phasing scheme of methodology 1 or 2. As a case study, methodology two is comprehensively studied based on a proposed DDI located at Moana Lane and U.S. 395, in Reno, Nevada. Through testing in a hardware-in-the-loop platform, this methodology can operate successfully for pre-timed, fully actuated, and coordinated actuated traffic signal controls. Microscopic simulation models were developed to evaluate the traffic signal operation of each scenario. The simulation results revealed that proposed methodology 2 reduces average delay by 17% in the morning (AM) peak hour and 28% in the afternoon (PM) peak hour at the Moana DDI, when compared to the methodology presented by staff from the City of Reno, NV. The average total delays of different cycle lengths show that the optimal cycle length changes with the variation of saturation flow ratios at this DDI. The simulations illustrated that the performances of the same traffic signal operation varied when it was applied to a variety of traffic volume distributions among routes. Therefore, developing a traffic signal operation for a DDI based on its traffic volume distributions on routes, instead of turning movement volumes, is necessary. The results also indicate that the range of signal operation performance on a variety of traffic volume distributions on routes reduces when the space between the two crossovers intersections of a DDI increases.

Author: United States. Federal Highway Administration. Implementation Division
Publisher:
ISBN:
Category : Electronic traffic controls
Languages : en
Pages : 184

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A comparative study of 5 signal timing control methods indicated that the most efficient method of signal control is the micrioprocessor which would allow an intersection to operate under actuated control during certain periods of the day and under predetermined timing patterns during other periods. The 5 signal timing methods considered were: Traffic Engineering Method, FHWA Design Manual Method, Fully Actuated Operation Method, Microprocessor with lagging Left-Turn Method, and Microprocessor with Leading Left-Turn Method. The "before" and "after" evaluation of these methods was made by pairing them in a series of six comparisons using time-lapse photography to supply vehicle data. The site selected for application of these comparisons was the Diamond Interchange of Interstate 95 Golfair Boulevard in Jacksonville, Florida. The study procedure is appropriate for signal timing studies made at: a diamond interchange, other interchange configurations with a ramp terminal and nearby signalized intersections, and a 2-way major street intersected by one or more one-way street pairs.

Author: G. Curtis Herrick
Publisher:
ISBN:
Category : Electronic traffic controls
Languages : en
Pages : 102

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Author: Karl Zimmerman
Publisher:
ISBN:
Category : Electronic traffic controls
Languages : en
Pages : 52

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Traffic engineers are often faced with operational and safety challenges at rural, high-speed signalized intersections. Vehicle-actuated control, combined with multiple advance detectors, is often used to improve operations and safety. However, this type of detection and control has not always resulted in a significant number of crashes. Crashes sometimes continue to occur at high-speed intersections, and delays to traffic movements can be unnecessarily long. An innovative detection-control system was developed for the Texas Department of Transportation to minimize both delay and crash frequency at rural intersections. This system was subsequently implemented at several intersections in Texas and its safety and operational benefits were evaluated. This report documents the findings and conclusions reached as a result of a three-year implementation project. The Detection-Control System was installed at each of eight intersections in Texas during the three-year period. Five of the intersections were suitable for a before-after study of safety and operational data. An evaluation of the before-after data indicated that the Detection-Control System was able to reduce delay by 14 percent, stop frequency by 9 percent, red-light violations by 58 percent, heavy-vehicle red-light violations by 80 percent, and severe crash frequency by 39 percent.

Author: Roelof Johannes Engelbrecht
Publisher:
ISBN:
Category : Electronic traffic controls
Languages : en
Pages : 140

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Author:
Publisher:
ISBN:
Category : Traffic engineering
Languages : en
Pages : 96

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This report describes a traffic control program for diamond interchanges designed for the New York/California Type 170 signal controller. Intended for traffic signal planning and operations, this document presents operational features and general information on the control program. This report is intended for traffic signal operations engineers and similar technical personnel.

Author:
Publisher:
ISBN:
Category : Electronic traffic controls
Languages : en
Pages : 670

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Book Description
This handbook, which was developed in recognition of the need for the compilation and dissemination of information on advanced traffic control systems, presents the basic principles for the planning, design, and implementation of such systems for urban streets and freeways. The presentation concept and organization of this handbook is developed from the viewpoint of systems engineering. Traffic control studies are described, and traffic control and surveillance concepts are reviewed. Hardware components are outlined, and computer concepts, and communication concepts are stated. Local and central controllers are described, as well as display, television and driver information systems. Available systems technology and candidate system definition, evaluation and implementation are also covered. The management of traffic control systems is discussed.

Author: Myung-Soon Chang
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 56

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