Communications: electrical – Traffic control indicator
Reexamination Certificate
2005-02-01
2005-02-01
Hofsass, Jeffery (Department: 2636)
Communications: electrical
Traffic control indicator
C340S917000, C701S118000, C701S119000
Reexamination Certificate
active
06850171
ABSTRACT:
A system and method for providing local intersection control includes controlling light signal transmitters at an intersection. A traffic condition at an intersection is cyclically detected, a signal program is selected that is matched to the detected traffic condition, and the selected signal program issues switching commands to the light signal transmitter. Characteristic traffic conditions are derived from the detected traffic conditions for the intersection, each characteristic traffic condition is assigned a signal program matched to this traffic condition, a metric is defined as measure for positions of two traffic conditions relative to each other, the characteristic traffic condition that is closest to the actual traffic condition with respect to the metric is determined, and the signal program assigned to the closest characteristic traffic condition is executed for triggering switching commands for the light-signal transmitters. A control device is also included for realizing the method. This system has a higher flexibility during changes in the traffic conditions than purely fixed-time controls and a higher capacity with minimum planning and supply expenditure and a moderate number of detectors.
REFERENCES:
patent: 3818429 (1974-06-01), Meyer et al.
patent: 5509082 (1996-04-01), Toyama et al.
patent: 2 207 487 (1973-09-01), None
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Alexander Bogomolny, In a Few Words . . . , Website www.cut-the-knot.org/do_you_know/few_words.shtml, copyright 1996-2004, definition of “space” and “distance”.*
Merriam-Webster's Collegiate Dictionary, Tenth Edition, 2001, the term “distance”.
Harness & Dickey & Pierce P.L.C.
Hofsass Jeffery
Stone Jennifer
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