How is an aerial device defined?

An aerial device is specifically defined as a vehicle-mounted device that can be either telescoping or articulating, and it is used to position personnel. This definition emphasizes the dual capabilities of such devices, which can extend or articulate to reach various heights and angles, allowing workers to perform tasks at elevated positions safely. Aerial devices are commonly used in scenarios like construction, maintenance, and firefighting, where access to height is necessary for carrying out work.

While the other options describe aspects of equipment related to lifting or loading, they do not capture the essential function of positioning personnel at height, which is a critical characteristic of aerial devices. The inclusion of both telescoping and articulating in the definition also highlights the versatility and functionality required of these devices to adapt to different operational needs in various environments.