Why should a driver treat a private, unmarked railroad crossing on a rural bus route with the same level of caution as a fully signed public crossing?

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1. The absence of official signage does not mean a train is any less likely to be present on those tracks
2. Unmarked crossings never carry active rail traffic of any kind
3. This caution is required only at crossings marked with a stop sign, since unmarked tracks are rarely used by trains
4. Private crossings are always inherently safer than public ones

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