Traffic management system

  • US 5,504,683 A
  • Filed: 06/16/1993
  • Issued: 04/02/1996
  • Est. Priority Date: 11/21/1989
  • Status: Expired due to Fees
First Claim
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1. In a traffic management system for a locality wherein positions in the locality are represented by a plurality of decision points indicative of crossing streets and an associated plurality of links indicative of streets which interconnect said decision points, a method for guiding vehicle around traffic congestion comprising the steps of:

  • maintaining at central traffic control a coordinate memory defining said decision points and links,detecting route congestion and altering information in said coordinate memory in response to said detected route congestion,transmitting from said central traffic control the altered contents of said coordinate memory,receiving in said vehicle said altered contents transmitted by said central traffic control,storing in a primary data segment of a memory a representation of at least one primary street in the locality having an associated plurality of decision points representing crossing street intersecting said at least one primary street,storing in a crossing street data segment of said memory vertical and horizontal coordinate information associated with said decision points along said primary street, at least one bearing representation of a route direction from at least one of said decision points to at least one other of said interconnecting decision points, and a crossing street identifier for referencing a crossing street in said memory,retrieving said primary street representation and at least one of said crossing streets from said memory,establishing an initial position of said vehicle within said locality,tracking movements of said vehicle in the locality by detecting a direction of travel of said vehicle at each said decision point,determining the position of said vehicle in said locality by comparing said initial position with a result of said tracking, anddisplaying information pertaining to said primary street representation and said crossing street identifier as the vehicle moves within said locality.

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