DETECTING STOPPAGE WAVES FOR FREEWAY CONTROL

AN EXPERIMENTAL WARNING SYSTEM HAS BEEN INSTALLED ON THE INBOUND CONTROL SECTION OF THE GULF FREEWAY AS A MEANS OF ALERTING DRIVERS APPROACHING CREST VERTICAL CURVES OF STOPPAGES DOWNSTREAM OF THE CREST. AUTOMATIC CONTROL OF THE WARNING SYSTEM DICTATED THE NEED TO IDENTIFY MEASURABLE TRAFFIC PARAMETERS THAT INDICATE THE PRESENCE OF A STOPPAGE WAVE. THIS PAPER PRESENTS AN ANALYSIS OF SELECTED SPEED AND ENERGY PARAMETERS AS INDICATORS OF STOPPAGE WAVES. THE RESULTS DEMONSTRATE THAT BOTH THE SPEED AND ENERGY PARAMETERS PERFORM SATISFACTORILY. BASED ON THE RESULTS OF THE INVESTIGATION, A DIGITAL COMPUTER CONTROL ALGORITHM WAS STRUCTURED FOR AUTOMATIC CONTROL OF THE WARNING SYSTEM. RECOMMENDATIONS ARE PRESENTED FOR DETECTOR PLACEMENT.

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/hrr/1973/469/469-001.pdf
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/030902255X
• Supplemental Notes:
  • Publication of this 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.
• Authors:
  • Dudek, Conrad L
  • Messer, Carroll J
• Discussers:
  • Wattleworth, Joseph A
  • Hess, Joseph W
• Conference:
  • 52nd Annual Meeting of the Highway Research Board
  • Location: Washington District of Columbia, United States
  • Date: 1973-1-22 to 1973-1-26
• Publication Date: 1973

Media Info

• Media Type: Digital/other
• Features: Figures; References;
• Pagination: pp 1-15
• Monograph Title: Freeway operational improvements
• Serial:
  • Highway Research Record
  • Issue Number: 469
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Algorithms; Automatic control; Curves (Geometry); Freeways; Information processing; Location; Stopping; Warning systems
• Uncontrolled Terms: Stopped vehicles
• Old TRIS Terms: Placement
• Subject Areas: Highways; Operations and Traffic Management;

Filing Info

• Accession Number: 00226855
• Record Type: Publication
• ISBN: 030902255X
• Files: TRIS, TRB
• Created Date: Apr 20 1974 12:00AM