The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 13, 1998
Filed:
Aug. 05, 1996
Till W Liepmann, Santa Monica, CA (US);
Pacific Sierra Research Corp., Santa Monica, CA (US);
Abstract
A system for monitoring traffic flow on multi-laned roadways. The system includes a plurality of radiation sources such as light emitting diodes, LEDs and a corresponding set of radiation detectors such as photo diodes. The radiation sources and detectors form a crossed array as well as direct paths across the roadway. By correlating radiation beam interruptions including the time and order of interruption, a signal processor such as a computer is able to determine traffic parameters for each lane. Multiple beams in parallel aid the reliability of the system. Using retroreflectors with the radiation sources and detectors on the same side of the roadway simplifies installation.