What is the shape and color of a railroad crossing sign?

The railroad crossing sign is characterized by its yellow circular shape featuring a black "X" in the center, often accompanied by the words "RAILROAD CROSSING" in black text. This design serves a critical purpose: it alerts drivers to an upcoming railroad crossing where trains may appear unexpectedly. The yellow color is used to signify caution, making it an essential warning for motorists. The black "X" enhances visibility and conveys the message clearly, ensuring that drivers recognize the potential hazard as they approach the crossing. It is important to be aware of such signs to prevent accidents and ensure road safety when navigating areas near railroad tracks.