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<p><span style="font-family:verdana,geneva;font-size:small;">How many grade crossing crashes have been prevented by the preemptive action of the engineer?  I know some are prevented if the train can be stopped short of a stalled vehicle on the track, but PTC will prevent that.  If I am not mistaken, that is a planned feature of PTC.  So, I do not see how the existence of grade crossing precludes driverless running. </span></p>
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