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Traffic monitoring system for determining vehicle dimensions, speed, and class

  • US 5,528,234 A
  • Filed: 02/01/1994
  • Issued: 06/18/1996
  • Est. Priority Date: 02/01/1994
  • Status: Expired due to Fees
First Claim
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1. A traffic monitoring device for determining an estimated speed of a vehicle traveling on a road, said vehicle having a predetermined height, comprising:

  • sonar ranging means mounted above said road for detecting the crossing of said vehicle and taking plural height measurements thereof, andcomputer means connected to said sonar ranging means for measuring a crossing time of said vehicle thereunder, and assigning an estimated length to said vehicle corresponding to said height measurements, and also calculating said estimated speed of said vehicle based on said crossing time and said estimated length,whereby said sonar ranging means will monitor the speed of said vehicle in clear weather, as well as in fog, rain, and snow.

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