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I can’t think of any audible warning on vehicles that is used as a preemptive, non-emergency warning like a train horn is.  Vehicles have horns, but they are only used for an emergency development or to tell the guy ahead that the light has turned green.  Probably the closest analogy to a train horn for a vehicle is the backup alarm used on some vehicles.     But your question raises two more questions: 1)       Does the fact that vehicles don’t seem to need preemptive horn warnings mean that trains probably don’t need them either? 2)      If not, then why can vehicles get along without them while trains cannot? I would answer question #1 as NO.  I have an answer for question #2, but I will wait to say it.    Do you have an answer for either or both of the two questions?
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