System for monitoring vehicles having a start and a stop pair of

Details System for monitoring vehicles having a start and a stop pair of System for monitoring vehicles having a start and a stop pair of

1992-09-03

1994-03-29

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

340936, 356 28, G01V 904

Patent

active

052987388

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.

REFERENCES:
patent: 2347194 (1944-04-01), Holliday
patent: 4247768 (1981-01-01), Elmer et al.
patent: 5066950 (1991-11-01), Schweitzer et al.

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