CAMEA SELECTION AND PLACEMENT FOR CCTV FREEWAY SURVEILLANCE IS EVALUATED IN EXPERIMENTS

Experiments were conducted on the North Central Expressway in Dallas, Texas to determine the best selection and location of closed circuit TV cameras for a freeway surveillance system. A new type of CCTV camera was developed which produces a usable picture under dark and low-light-level conditions. Experiments undertaken with a leased camera at night yielded the following conclusions: low-light-level TV cameras do produce a better image under low illumination levels than conventional cameras; zoom lenses and focal length extenders are necessary to effect a savings in hardware; increased mounting height reduces the number of obstacles between the camera and the televised scen; roof-top mounted cameras can be much less expensive than separate support stuctures; use of low-light-level cameras for detection of low-volume incidents at night is questionable.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/1587330
• Corporate Authors:

  Texas Transportation Institute

  Texas A&M University System, 1600 E Lamar Boulevard
  Arlington, TX  United States  76011
• Publication Date: 1976-10

Media Info

• Pagination: p. 6
• Serial:
  • Texas Transportation Researcher
  • Volume: 12
  • Issue Number: 4
  • Publisher: Texas Transportation Institute
  • ISSN: 0040-4748

Subject/Index Terms

• TRT Terms: Closed circuit television; Experiments; Freeway operations; Television cameras; Traffic surveillance
• Uncontrolled Terms: Focal length
• Subject Areas: Highways; Operations and Traffic Management;

Filing Info

• Accession Number: 00144190
• Record Type: Publication
• Files: TRIS
• Created Date: Apr 13 1977 12:00AM