TRAFFIC FLOW SENSING AND SURVEILLANCE SYSTEM - FINAL REPORT- PHASE II
THE DEVELOPMENT OF AN ENGINEERING MODEL TRAFFIC FLOW SENSING AND SURVEILLANCE SYSTEM IS DESCRIBED. THE OPER- ATIONAL REQUIREMENTS OF THE SYSTEM AS DERVIVED IN PHASE I OF THE CONTRACT ARE REVIEWED AND MODIFIED WHERE APPROPRIATE. THE ALTERNATE DESIGN APPROACHES CONSIDERED AND THE REASONS FOR SELECTING PARTICULAR ONES ARE DISCUSSED. THE ENGINEERING MODEL SYSTEM AS DESIGNED AND CONSTRUCTED CONSISTS OF TWO NEARLY INDEPENDENT SUBSYSTEMS (A DETECTION-DISCRIMINATION SYSTEM AND A SURVEILLANCE-STORAGE SYSTEM). THE DETECTION- DISCRIMINATION SYSTEM IS BASICALLY A REAL-TIME PATTERN RECOGNITION SYSTEM DESIGNED TO IDENTIFY THOSE SOUNDS ASSOCIATED WITH TYPICAL MOTTOR VEHICLE COLLISIONS, WHILE DISREGARDING THOSE SOUNDS EMANATING FROM OTHER SOURCES COMMON TO URBAN INTERSECTION ENVIRONMENTS. THE SYSTEM CONSISTS OF AN ENVIRONMENTALLY PROTECTED MICROPHONE WHOSE OUTPUT SIGNALS ARE AMPLIFIED AND PASSED THROUGH FREQUENCY SELECTIVE FILTERS. THE OUTPUTS OF THE FILTERS ARE PROCESSED AND COMPARED IN AMPLITUDE TO A DERIVED DYNAMIC THRESHOLD LEVEL, AND COMPARED IN TIME TO EACH OTHER. WHEN THE DETECTED SOUNDS HAVE CERTAIN FREQUENCY, AMPLITUDE AND RISE TIME CHARACTERISTICS SIMILAR TO THOSE GENERATED DURING VEHICLE COLLISIONS, A DETECTION SIGNAL IS GENERATED WHICH ACTIVATES THE SURVEILLANCE-STORAGE SYSTEM. THE SURVEILLANCE-STORAGE SYSTEM EMPLOYS TWO TELEVISION CAMERAS WHICH CONTINUOUSLY SURVEY AN ENTIRE INTERSECTION FROM APPROPRIATE ELEVATIONS. A VIDEO DISC RECORDER SYSTEM CONTAINING 20 SECONDS OF PREVIOUS VIDEO INFORMATION IS CONTINUOUSLY UPDATED WITH NEW INFORMATION FROM THE TELEVISION CAMERAS. WHEN A DETECTION SIGNAL IS GENERATED, IT CAUSES THE PAST 20 SECONDS OF INFORMATION TO BE RECOVERED AND PERMANENTLY RECORDED ON TWO 16 MM MOVING PICTURE FILMS. THE EXPERIENCE GAINED IN ESTABLISHING AN URBAN INTERSECTION TEST SITE IS DISCUSSED AND THE LIMITED OPERATION OF THE ENGINEERING MODEL SYSTEM PRIOR TO ITS DELIVERY TO THE BUREAU OF PUBLIC ROADS IS EVALUATED. THE DESIGN AND OPERATIONAL PERFORMANCE OF THE ENGINEERING MODEL SYSTEM ARE DISCUSSED AND VARIOUS ALTERNATIVE DESIGN MODIFICATIONS AND INNOVATIONS ARE RECOMMENDED FOR THE FUTURE DEVELOPMENT OF A MORE PRODUCTION ORIENTED TRAFFIC FLOW SENSING AND SURVEILLANCE SYSTEM. THE PRELIMINARY WORK AIMED AT DESIGNING AND DEVELOPING A COMPUTER ORIENTED, SEMI-AUTOMATIC SYSTEM FOR READING AND REDUCING THE DATA GENERATED BY A TRAFFIC FLOW SENSING AND SURVEILLANCE SYSTEM IS ALSO DESCRIBED. /AUTHOR/
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Supplemental Notes:
- Cpr-11-0956, YB-1957-X-105
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Corporate Authors:
Cornell Aeronautical Laboratory, Incorporated
4455 Genesee Street
Buffalo, NY United States 14221New York State Department of Transportation
1220 Washington Avenue
Albany, NY United States 12232Bureau of Public Roads /US
400 7th Street, SW
Washington, DC United States 20590Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC United States 20590 -
Authors:
- Stillman, I L
- Publication Date: 1968-11-30
Subject/Index Terms
- TRT Terms: Computers; Crashes; Data storage; Detection and identification; Detectors; Mathematical models; Television cameras; Traffic crashes; Traffic simulation; Traffic surveillance; Vehicle detectors
- Uncontrolled Terms: Models; Motor vehicle accidents
- Subject Areas: Highways; Operations and Traffic Management;
Filing Info
- Accession Number: 00224914
- Record Type: Publication
- Source Agency: Bureau of Public Roads /US
- Files: TRIS, USDOT, STATEDOT
- Created Date: Jul 22 1994 12:00AM