SOME DESIGN CONSIDERATIONS OF DIGITAL COMPUTER CONTROL SYSTEMS APPLIED TO FREEWAY TRAFFIC OPERATIONS
A CENTRALIZED DIGITAL COMPUTER CONTROL SYSTEM WAS DEVELOPED FOR THE SURVEILLANCE AND CONTROL OF FREEWAY TRAFFIC. THE SYSTEM DESIGN IS PRIMARILY CONCERNED WITH THE ANALYSIS, DEFINITION, AND DEVELOPMENT OF SYSTEM COMPONENT REQUIREMENTS COMMENSURATE WITH THE GENERAL NATURE OF THE CONTROL SYSTEM SPECIFICATION. THE EQUIPMENT THAT CONSTITUTES AN ON-LINE CONTROL SYSTEM IS DIVIDED INTO SEVERAL CLASSES: (1) DATA PROCESSING INPUT-OUTPUT UNITS, (2) MAGNETIC DISK FILES, (3) THE CONTROL UNIT WHICH IS THE CENTRAL DIGITAL COMPUTER, (4) COMMUNICATION LINKS WHICH TRANSMIT DATA BETWEEN THE FIELD SENSORS AND THE CENTRAL COMPUTER, AND (5) PROCESS CONTROL INPUT-OUTPUT UNITS WHICH ARE MOSTLY LOOP DETECTORS FOR INPUT AND TRAFFIC SIGNALS ON THE ENTRANCE RAMPS FOR OUTPUT. THE PROGRAMMING REQUIREMENTS OF THE CONTROL SYSTEM CONSIST OF FOUR INTERACTING SUBSYSTEMS: SUPERVISORY, CONTROL, DATA-ACQUISITION, AND ANALYSIS PROGRAMS. A STEP-BY-STEP DESIGN PROCEDURE IS OUTLINED AND EACH OF THE DESIGN REQUIREMENTS DISCUSSED.
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Supplemental Notes:
- Paper sponsored by Committee on Freeway Operations. 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
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Authors:
- Buhr, J H
- Drew, D R
- Gay, J N
- Whitson, R H
- Publication Date: 1969
Media Info
- Media Type: Print
- Pagination: pp 150-152
- Monograph Title: Freeway traffic characteristics and control
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Serial:
- Highway Research Record
- Issue Number: 279
- Publisher: Highway Research Board
Subject/Index Terms
- TRT Terms: Automatic control; Data collection; Digital computers; Electronic control; Freeway operations; Freeways; Information processing; Traffic control; Traffic surveillance; Vehicle detectors
- Old TRIS Terms: Traffic control systems
- Subject Areas: Highways; Operations and Traffic Management;
Filing Info
- Accession Number: 00225543
- Record Type: Publication
- Report/Paper Numbers: Paper No 1
- Files: TRIS, TRB
- Created Date: Oct 21 1994 12:00AM