Diamond Interchange Program
Diamond Interchange Program

Author:

Publisher:

Published: 1981

Total Pages: 96

ISBN-13:

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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.

Traffic Control Systems Handbook
Traffic Control Systems Handbook

Author:

Publisher:

Published: 1976

Total Pages: 670

ISBN-13:

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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.

Effective Placement of Detectors at Diamond Interchanges
Effective Placement of Detectors at Diamond Interchanges

Author: Dayakar Prabhakar

Publisher:

Published: 1994

Total Pages: 82

ISBN-13:

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This report summarizes results of a study of detector placement on the diamond interchange frontage road (ramp) using the Texas Intersection Simulation Model. The criterion used for the optimization is the minimization of delay. A secondary criterion is to reduce the dilemma zone to a minimum. The results indicate that the first detector located along the frontage road (ramp) should be placed about 30 meters (100 feet) back from the stop bar. The remainder of the layout should provide a vehicle interval between 1.1 and 1.3 seconds and not trap a vehicle a the design speed in a dilemma situation. The recommended layout of detectors achieves these two goals.

Evaluation of Operational Efficiencies, Cost, and Accident Experience of Four Phase Single Point Urban Interchanges
Evaluation of Operational Efficiencies, Cost, and Accident Experience of Four Phase Single Point Urban Interchanges

Author: Jim C. Lee

Publisher:

Published: 2002

Total Pages: 218

ISBN-13:

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This research compares two interchange types, the Tight Urban Diamond Interchange (TUDI) and the Four Phase Single Point Urban Interchange (40SPUI). The 40SPUI is referred to in this report as a Single Point Urban Interchange with Frontage Roads (SPUI/F). The objectives of this research were to: (1) evaluate the SPUI/F based on available accident data and conflict analysis techniques, right-of-way and construction costs, and operating efficiency; (2) compare the performance of the SPUI/F and the TUDI; (3) evaluate current SPUI/F design assumptions and operation and recommend design and/or operational changes to enhance performance; and (4) evaluate the interchange form selection (pre-design) process and recommend changes where appropriate. The research found no significant difference in the safety aspects of the two interchange types. The SPUI/F generally did not perform as well operationally as the TUDI, with increased SPUI/F delay as the distance between frontage roads increased.