System for monitoring vehicles having a start and a stop pair of beams
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United States of America Patent
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-
Mar 29, 1994
Grant Date -
N/A
app pub date -
Sep 3, 1992
filing date -
Aug 11, 1992
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A beam system for traffic monitoring which comprises transmitters for two pairs of beams which constitute a start and a stop pair of beams which in use are spaced from each other by a known distance; receivers for each beam; electronic means connected to detect when reception of the beams by the receivers are interrupted; and means for manipulating data including that derived from the receivers according to desired algorithms, wherein there are provided two pairs of beams, one pair of beams being located at a different level from the other with means for comparing speed or other quantities with the option of rejecting the detection if they do not sufficiently agree.
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