crossbuck

thumb|200px|United States|American crossbucks at the intersection of Redrock Randsburg Road and the Southern Pacific (now [[Union Pacific) Railroad, in the Mojave Desert near Garlock, California, May 2004]]

A crossbuck is a traffic sign used to indicate a level railway crossing. It is composed of two slats of wood or metal of equal length, fastened together on a pole in a saltire formation (resembling the letter X). Crossbucks are often supplemented by electrical warnings of flashing lights, a bell, and/or a boom barrier that descends to block the road and prevent traffic from crossing the tracks.