A crossbuck is a type of road sign used to indicate a railroad crossing. It typically features a white background with a bold black "X" shape and the words "RAILROAD CROSSING" displayed prominently. This sign alerts drivers and pedestrians to the potential danger of approaching trains, helping to prevent accidents at these intersections. Crossbucks are often placed at locations where roads intersect with railway tracks. In many regions, they are accompanied by additional warning signs, such as flashing lights or gates, to enhance safety. The design and placement of crossbucks are regulated by organizations like the Federal Highway Administration in the United States.