INTERDEPENDENCE OF CERTAIN OPERATIONAL CHARACTERISTICS WITHIN A MOVING TRAFFIC STREAM

THE CONGRESS STREET EXPRESSWAY SURVEILLANCE PROJECT INVESTIGATED THE INTERDEPENDENCE OF CERTAIN FREEWAY OPERATIONAL CHARACTERISTICS WITHIN A MOVING TRAFFIC STREAM BY MEANS OF ELECTRONIC TRAFFIC SURVEILLANCE EQUIPMENT. LANE OCCUPANCY, WHICH IS A POINT MEASUREMENT COMPARABLE WITH CONCENTRATION, WAS COMPARED TO VOLUME AND SPEED, AND THE INTERRELATIONSHIP WAS RECORDED. LANE OCCUPANCY WAS USED TO PREDICT VEHICLE SPEEDS WITH REASONABLE ACCURACY. AERIAL PHOTOGRAPHS WERE USED TO COMPARE OCCUPANCY AND AERIAL DENSITY OF TRAFFIC. THE COMPARISON EMPHASIZED THE CONTRAST BETWEEN POINT MEASUREMENTS AND SECTION MEASUREMENTS. TRAFFIC CONGESTION WAS DISCUSSED AND A POSSIBLE DEFINITION OF CONGESTION WAS DEVELOPED. SPEED INVERSION WAS DESCRIBED. THE VALUE OF VARIOUS MEASURES OF TRAFFIC PERFORMANCE INCLUDING VOLUME, SPEED, SPEED DIFFERENCES, HEADWAYS AND OF VARIATIONS IN INDIVIDUAL SPEEDS, SPEED DIFFERENCES AND HEADWAYS FOR PREDICTING THE ADVENT OF CONGESTION WAS CONSIDERED. THE POSSIBLE REQUIREMENTS OF A TRAFFIC CONTROL SYSTEM /SUCH AS RAMP METERING/ TO CONTROL CONGESTION WERE STUDIED.

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/hrr/1965/72/72-004.pdf
• Supplemental Notes:
  • 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:
  • Athol, Patrick
• Publication Date: 1965

Language

• English

Media Info

• Media Type: Print
• Features: Figures; References; Tables;
• Pagination: pp 58-87
• Monograph Title: Traffic flow characteristics 1963 and 1964
• Serial:
  • Highway Research Record
  • Issue Number: 72
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Alternatives analysis; Control; Forecasting; Freeway operations; Freeways; Interchange ramps; Measurement; Point demerit systems; Traffic congestion; Traffic control; Traffic density; Traffic flow; Traffic lanes; Traffic speed; Traffic surveillance; Traffic volume; Travel time
• Uncontrolled Terms: Occupancy
• Old TRIS Terms: Freeway ramps; Lanes; Metering; Points; Section measurements; Speed inversion; Traffic control systems
• Subject Areas: Highways; Operations and Traffic Management;

Filing Info

• Accession Number: 00226992
• Record Type: Publication
• Report/Paper Numbers: HS-006 579
• Files: TRIS, TRB
• Created Date: Aug 13 2004 6:55PM