According to OSHA regulations, what must be provided at both ends of a trolley's travel?

Under OSHA regulations, providing buffers at both ends of a trolley's travel is essential for ensuring safety and preventing accidents. Buffers are designed to absorb the impact when the trolley reaches the end of its travel path. This can significantly reduce the risk of damage to the equipment and prevent injury to personnel nearby. By utilizing buffers, the mechanical stress and potential for accidents that could result from a hard stop are mitigated, creating a safer working environment.

The other options, while related to safety and equipment functionality, do not specifically address the requirement for end-of-travel safety measures for trolleys as outlined by OSHA. Thus, buffers are the correct choice in this context.