A Cross-buck
*Added - These signs, with the words RAIL ROAD CROSSING, are required at nearly all publc highway-railroad grade crossings in the US, and are generally mounted within 20 feet of the actual crossing. In Canada, a set that is white with red border is replacing the US type.
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A large X, referred to as a crossbuck.
I'm not sure...
john moody
It is the prefix
I don't think no one discovered that before. I never thought of that! Good question!