Which type of ladder is often used for accessing elevated structures?

The extension ladder is commonly used for accessing elevated structures due to its design and versatility. It can be adjusted to reach various heights, making it ideal for tasks that require reaching high places, such as telecom tower maintenance, roof access, or other elevated work environments. The ladder can be extended and locked into position, providing stability and security when working at height.

In contrast, a step ladder is typically used for lower access jobs, providing a stable platform but not suited for heights beyond its fixed height limits. A platform ladder offers a large, flat surface to stand on but does not provide the extended reach required for tall structures. A folding ladder, while portable and convenient, also lacks the necessary height adjustability that an extension ladder offers. Therefore, the extension ladder is the best choice for safely accessing elevated structures in telecom applications.