What should signs indicate at all entrances to a worksite according to OSHA requirements?

Signs at all entrances to a worksite must indicate the presence of hazards, as required by OSHA standards. This is crucial for ensuring the safety of workers and visitors. By clearly communicating the types of hazards present, such as chemical exposure, electrical risks, or physical dangers, the signs play a vital role in preventing accidents and injuries. The awareness of potential risks helps individuals take the necessary precautions before entering the worksite, thereby fostering a safer working environment.

While the other options may provide useful information, they do not address the primary intent of safety communication mandated by OSHA. Knowing work hours, available equipment, or prohibited items does not directly mitigate risk in the same manner as understanding existing hazards does. The focus on hazard presence is key to protecting health and safety in the workplace.