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An X marking on a rural highway signifies that drivers are approaching a railway crossing. This symbol is used as a warning to alert motorists of the potential for trains crossing the roadway. The design of the X, often accompanied by other signage, is specifically intended to prompt drivers to reduce speed, look both ways, and be prepared to stop if a train is approaching.

Other choices might seem relevant, but they don't reflect the specific purpose of the X mark. Construction zones, fork in the road signs, and yield indicators use distinct symbols or signs that convey their specific meanings, thus distinguishing them from the X marking typically reserved for railway crossings.