INVESTIGATION OF TRAFFIC DYNAMICS BY AERIAL PHOTOGRAMMETERY TECHNIQUES

RESEARCH CONDUCTED DURING THE FIRST THREE-YEAR PHASE OF THIS STUDY BY THE OHIO STATE UNIVERSITY IS DESCRIBED. THE MAJOR EFFORT WAS CENTERED AROUND TWO TOPICS: (1) ACQUISITION OF TRAFFIC DATA BY AERIAL PHOTOGRAMMETRIC TECHNIQUES, AND (2) VALIDATION AND DEVELOPMENT OF TRAFFIC FLOW THEORY. THE WORK HAS BEEN GROUPED INTO FIVE CHAPTERS AS FOLLOWS: CHAPTER 1: DATA ACQUISITION BY AERIAL PHOTOGRAPHY. TECHNIQUES FOR DATA COLLECTION AND DATA REDUCTION ARE DESCRIBED IN DETAIL AND METHODS DISCUSSED FOR DEVELOPMENT OF VEHICLE TRAJECTORIES. CHAPTER 2: INVESTIGATION OF KINEMATIC DISTURBANCE IN TRAFFIC FLOW. EXISTING THEORETICAL MODELS WHICH DEVELOP CRITERIA FOR THE STABILITY OF TRAFFIC FLOW WERE EXAMINED AND FOUND TO BE IN AGREEMENT WITH FINDINGS DERIVED FROM THE AERIAL SURVEYS OF TRAFFIC FLOW. CHAPTER 3: THEORETICAL CONSIDERATIONS FOR EFFECTIVE TRAFFIC CONTROL AND ITS APPLICATIONS,. THE CONCLUSION IS REACHED THAT DETERMINATION OF THE VALUE AT CRITICAL SECTIONS APPEARS TO OFFER THE BASIS FUNCTION FOR FREEWAY TRAFFIC CONTROL. CHAPTER 4: THE DISTRIBUTION OF VEHICULAR HEADWAYS. OBSERVED HEADWAYS FOR SEVERAL FLOW LEVELS WERE FITTED TO THE LOGINOMAL DISTRIBUTION AND SUBJECTED TO THE KOLMOGOROV-SMIRNOV TEST WITH GOOD RESULTS. CHAPTER 5: STUDIES OF TRAFFIC DYNAMICS. SEVERAL PILOT STUDIES WERE CONDUCTED TO INVESTIGATE A MULTILINEAR FUNCTION TO DESCRIBE THE SPEED-DENSITY BEHAVIOR, TO LOCATE THE POINT OF FULL ENERGY RECOVERY IN THE HYSTERESIS LOOP, AND TO EXAMINE THE CONCEPT OF ENERGY CHANGE AS A MEASURE OF THE QUALITY OF FREEWAY TRAFFIC. /BPR/

• Supplemental Notes:
  • Hpr, Ees-278
• Corporate Authors:

  Ohio State University, Columbus

  190 North Oval Drive
  Columbus, OH  United States  43210

  Bureau of Public Roads /US

  400 7th Street, SW
  Washington, DC  United States  20590

  Ohio Department of Highways

  Columbus, OH  United States  43210
• Authors:
  • Treiterer, J
• Publication Date: 0

Subject/Index Terms

• TRT Terms: Aerial photography; Data collection; Data reduction; Freeways; Headways; Kinetics; Photogrammetry; Traffic control; Traffic density; Traffic flow; Traffic flow theory; Traffic speed
• Subject Areas: Design; Highways; Operations and Traffic Management;

Filing Info

• Accession Number: 00227013
• Record Type: Publication
• Source Agency: Bureau of Public Roads /US
• Files: TRIS
• Created Date: Jan 12 1970 12:00AM