What is crossbuck sign?

A crossbuck sign is a traffic sign typically found at railroad crossings. It consists of two white, reflective, perpendicular bars in the shape of an "X." The words "RAILROAD CROSSING" are usually printed in black on the sign.

The purpose of a crossbuck sign is to alert drivers of the presence of railroad tracks and to remind them to look and listen for trains before proceeding across the tracks. Drivers should always stop when the lights are flashing or the gates are down at a railroad crossing, regardless of whether a train is visible.

Crossbuck signs are required by law at all public railroad crossings in the United States. They are an important safety measure to prevent accidents between trains and vehicles. It is essential for drivers to obey these signs and other signals and to always exercise caution when approaching and crossing railroad tracks.