A crossbuck sign is used to warn of what?

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A crossbuck sign signals a railroad crossing ahead. The crossbuck, an X-shaped sign, is the standard symbol used to mark where a railroad intersects the road. When you see it, slow down, look both ways, and listen for an approaching train. Trains can come from either direction and may be closer or faster than you expect, so proceed only when the tracks are clear and any signals or gates indicate it’s safe. If lights are flashing or gates are down, obey them and stop. This sign is specific to railroad crossings, not to stop signs, construction, or pedestrian crossings.