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System for monitoring traffic conditions in connection with the control thereof

  • US 3,906,438 A
  • Filed: 02/14/1973
  • Issued: 09/16/1975
  • Est. Priority Date: 02/17/1972
  • Status: Expired due to Term
First Claim
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1. A system for monitoring traffic flow on streets having at least two traffic lanes free from oppositely directed traffic, particularly highways, wherein each traffic lane can be monitored, at least at one common monitoring location, by respective vehicle detectors, comprising for each detector a measuring system for deriving representative magnitudes of time intervals between successive vehicles at the associated detector, means for forming values representative of such magnitudes and comprising a mean value device to which interval magnitudes are supplied, and a memory for storing successive mean interval values derived from said mean value device, the output of said value forming means supplying such representative values, comparison means for effecting a predetermined comparison function between a plurality of representative values, and means operatively connecting corresponding outputs of the respective value-forming means of a plurality of said detectors to said comparison means for comparison of the respective representative values of said detectors, the output of said comparison means being operative to provide an evaluatable output magnitude related to the traffic flow.

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