Traffic responsive ramp control has been proved effective in the reduction of traffic congestion on major metropolitan freeways. A low-cost ramp controller is needed that can serve traffic responsive ramp controls either for signal-ramp local operations or for operations involving multilevel controls. Since 1974, the California Department of Transportation has been conducting research and evaluations on the application of microcomputer for traffic responsive ramp controls. The second-generation microcomputers have sufficient capabilities to replace large-scale computers and mini-computers in most traffic control functions. Attractive features of microcomputers include low cost, small physical size, and operability within the ambient temperature range of minus 18 deg. C to 60 deg. C (minus 27.78 deg. F to 15.56 deg. F) without air conditioning. Use of the microcomputer probably will become standard on California highways for both ramp and intersection controls, especilly as a result of the growing emphasis on upgrading the operation of existing facilities rather than the building of new facilities.

Media Info

  • Media Type: Digital/other
  • Pagination: p 38
  • Monograph Title: Traffic control: signals and other devices
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00149220
  • Record Type: Publication
  • ISBN: 0309025664
  • Report/Paper Numbers: FCP 42l1024
  • Contract Numbers: C-1-12
  • Files: TRIS, TRB
  • Created Date: Mar 30 1977 12:00AM