What must employees wear when providing on-ground warning at a road crossing?

When providing on-ground warning at a road crossing, employees must wear PPE, specifically a safety vest. This is essential for ensuring their visibility to both passing trains and motorists. The bright color and reflective properties of the safety vest enhance the safety of employees working near active train tracks, making them easily seen in various lighting and weather conditions.

The use of PPE is critical in maintaining a safe environment while conducting operations that involve potential hazards, particularly in areas where there is vehicle traffic and the possibility of encountering unexpected situations. While other items, such as a standard uniform or hard hat, may be important in different contexts or for personal protection in certain job functions, the requirement for a safety vest specifically addresses the need for visibility in the high-risk scenario of road crossings.