TRAFFIC FLOW SENSING AND SURVEILLANCE SYSTEM

THE DEVELOPMENT OF AN ENGINEERING MODEL FOR THE TRAFFIC FLOW SENSING AND SURVEILLANCE SYSTEM IS DESCRIBED AND THE VARIOUS TRADEOFF IN DESIGN ARE EXPLAINED. THE MODEL SYSTEM CONSISTS OF TWO NEARLY INDEPENDENT SUBSYSTEMS (A DETECTION-DISCRIMINATION SYSTEM AND A SURVEILLANCE-STORAGE SYSTEM). THE DETECTION-DISCRIMINATION SYSTEM IS A REAL-TIME PATTERN-RECOGNITION SYSTEM WHICH IDENTIFIES SOUND ASSOCIATED WITH TYPICAL MOTOR-VEHICLE COLLISIONS AND DISREGARDS OTHER SOUNDS COMMON TO AN URBAN INTERSECTION. THE SYSTEM IS A MICROPHONE WITH ELECTRONIC FILTERING AND A LOGIC SYSTEM. THE SURVEILLANCE-STORAGE SYSTEM USES TWO TELEVISION CAMERAS TO SURVEY AN ENTIRE INTERSECTION CONTINUOUSLY. A VIDEO DISC RECORDING STORES THE PREVIOUS TWENTY SECONDS OF VIDEO INFORMATION AND IS CONTINOUSLY UNDATED. WHEN A DETECTION SIGNAL OCCURS, THE CONTENTS OF THE VIDEO DISC ARE DUMPED ONTO TWO 16-MM MOVING-PICTURE FILMS. THE EXPERIENCE OF ESTABLLSHING A TEST SITE AT AN URBAN INTERSECTION IN BUFFALO IS DISCUSSED ALONG WITH THE OPERATION OF THE MODEL SYSTEM. WHEN OPERATING OVER WIDE DYNAMIC RANGES OF SOUND LEVELS ENCOUNTERED AT THE TEST SITE, THERE WAS SUITABLE DISCRIMINATION AGAINST USUAL NOISES. THE FALSE ALARM RATE IS SEVERAL PER DAY. /BPR/

• Corporate Authors:

  Bureau of Public Roads /US

  400 7th Street, SW
  Washington, DC  United States  20590
• Authors:
  • Stillman, I L
• Publication Date: 1968-11-30

Subject/Index Terms

• TRT Terms: Magnetic tapes; Motion pictures; Television cameras; Traffic flow; Traffic surveillance; Transducers
• Old TRIS Terms: Magnetic tape recording
• Subject Areas: Highways; Operations and Traffic Management;

Filing Info

• Accession Number: 00225723
• Record Type: Publication
• Source Agency: Traffic Systems Reviews & Abstracts
• Report/Paper Numbers: Yb-1957-x-105
• Files: TRIS
• Created Date: Jun 15 1970 12:00AM