CONTROL OF TRAFFIC IN TUNNELS TO MAXIMIZE FLOW

IN 1961 A PRELIMINARY CONTROL SYSTEM BASED ON SPEED AND FLOW MEASUREMENTS WAS IMPLEMENTED IN THE HOLLAND TUNNEL SOUTH TUBE. A RED LIGHT AT THE ENTRANCE PORTAL INTRODUCED GAPS INTO THE FLOW IN ORDER TO AVOID STOP-AND-GO WAVES AND ATTEMPT TO INCREASE THE FLOWS. THIS PAPER PRESENTS AN INEXPENSIVE WAY OF IMPROVING THE EXISTING HOLLAND TUNNEL SYSTEM, EXPERIMENTAL EVIDENCE IS USED TO SUPPORT THE PROPOSED CHANGE. IT ALSO PRESENTS SEVERAL CONTROL LOGICS, BASED ON SPEEDS AND DENSITIES, WHICH CAN BE IMPLEMENTED BY EITHER USE OF A FIXED PROGRAM ANALOG DEVICE OR OF A GENERAL ANALOG COMPUTER. A MODEL IS DERIVED FOR GENERAL-PURPOSE CONTROL OF SINGLE-LANE FLOW BASED ON FINITE-STATE MACHINE THEORY. IMPLEMENTATION OF THIS SYSTEM, WHICH IS MORE FLEXIBLE THAN THE PREVIOUS ONE, REQUIRES A DIGITAL COMPUTER. IN THE APPENDIX A METHOD IS PRESENTED OF ESTIMATING SECTION DENSITY USING ONE OR MORE POINT VELOCITIES, AND THE INPUT FLOW IS GIVEN AND AN APPROXIMATE EXPERIMENTAL VERIFICATION IS MADE. THIS METHOD CAN BE USED AS A MONITOR FOR A DENSITY MEASURING DEVICE BASED ON CAR-COUNT, WHICH DRIFTS WHENEVER CARS CHANGE LANE OR A COUNT IS MISSED. /AUTHOR/

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/hrr/1967/154/154-001.pdf
• Supplemental Notes:
  • Paper sponsored by Committee on Theory of Traffic Flow and presented at the 45th Annual Meeting. 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:
  • Duckstein, Lucien
• Publication Date: 1967

Language

• English

Media Info

• Media Type: Print
• Features: Appendices; Figures;
• Pagination: pp 1-23
• Monograph Title: Traffic flow characteristics
• Serial:
  • Highway Research Record
  • Issue Number: 154
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Analog computers; Control systems; Digital computers; Highway operations; Mathematical models; Maximization; Measurement; Speed; Traffic; Traffic density; Traffic flow; Traffic signals; Tunnels; Vehicular tunnels
• Uncontrolled Terms: Models
• Old TRIS Terms: Analog systems; Maxima; Tunnel traffic operations
• Subject Areas: Bridges and other structures; Highways; Operations and Traffic Management;

Filing Info

• Accession Number: 00227053
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Aug 13 2004 6:56PM