×

Autonomous controller for traffic signals

  • US 5,822,711 A
  • Filed: 11/20/1995
  • Issued: 10/13/1998
  • Est. Priority Date: 11/20/1995
  • Status: Expired due to Fees
First Claim
Patent Images

1. A system for controlling traffic signals at a plurality of intersections, said system comprising:

  • a first autonomous controller for controlling the traffic signals at a first intersection; and

    an autonomous controller at each of the remaining of said plurality of intersections;

    each of said autonomous controllers, including said first autonomous controller, having a real time clock accurate to within a few seconds per month for indicating the time of day;

    each of said autonomous controllers, including said first autonomous controller, having a memory circuit for storing two or more cycle structures for traffic signals intended for use at different times of day;

    wherein the controllers at each intersection act in concert with each other by depending upon the time of day indicated by the real time clock within each such controller without communication among the controllers, and without communication between the controllers and an external reference more frequently than once per month.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×