Case histories are presented which illustrate how computer controlled on-ramp signals are dramatically speeding run-hour traffic on freeways. With street networks, however, gains in average travel speed are usually far less dramatic. Tiny computers, one per signalized intersection, are being installed in cities in California and Colorado. Separate computers require less transmission of data between intersections. A tiny slave processor is now being installed at each of 35 intersections in Colorado. These will be linked to a central computer that, in all, will coordinate signals at 142 intersections. Each of nine arterials widely scattered throught Sacramento has its own mini computer to coordinate traffic flow through signalized intersections along that arterial. New Jersey Turnpike plans to begin operation on a computerized system, and computerized on-ramp controls limiting entry to a freeway during rush hours (so as to prevent traffic from slowing) have been successful in Minneapolis. Fifty three percent reduction in number of stops and 24 percent increase in average speed are reported in a 28-intersection network in Los Angeles County.

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Filing Info

  • Accession Number: 00128810
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Mar 29 1976 12:00AM