Crossing predictor with authorized track speed input
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United States of America Patent
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Oct 30, 2012
Grant Date -
Sep 22, 2011
app pub date -
Mar 17, 2010
filing date -
Mar 17, 2010
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A method and apparatus for controlling a grade crossing warning system employs a track occupancy circuit or other device to detect the presence of a train in the approach to a grade crossing and an indirect indication of a maximum authorized speed of the train in order to determine an amount of time to delay activation of the grade crossing warning system after the train has been detected. The indirect indication is preferably encoded onto a signal associated with the track occupancy circuit, preferably using a frequency shift technique. The indirect indication may be supplied by a wayside signal device.
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