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As I have previously explained, I have thrown out the 1995 study.  However, it is not needed for the point I am making.    One way to answer the question of this thread title would be with the use of empirical evidence.  I do not find any reference to such evidence.  Another way to answer the question is with logical deduction.  For that method, we need to know the answer to this question: What does horn blowing accomplish at crossings that have red flashing lights and gates that only block the lane, and no road center barrier?  We know that the horn signal contributes safety at this type of crossing because the quiet zone authority tells us that it is true.    Therefore, to answer the question of what the horn blowing accomplishes at the crossing type described above, a determination must be made as to whether the train horn could prevent a collision or injury resulting from the following types of driver behavior: 1)      Driver driving around lowered gate. 2)      Driver driving straight and trying to beat the lowering gate. 3)      Driver asleep. 4)      Driver impaired. 5)      Driver distracted by a medical condition. 6)      Driver distracted by a device. 7)      Driver distracted by inattention. 8)      Suicide by train. 9)      Vehicle stalled on tracks.   With a quiet zone, the horn signal is removed, and to compensate for the resulting loss of safety, new safety features must be added that address item #1 above.  There is no requirement to add new features that address items #2-9.
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