What type of extension ladder is known for incorporating staypoles?

The Bangor ladder is known for incorporating stay poles, which provide additional support and stability when the ladder is extended for use. Stay poles are typically angled outward from the ladder to the ground, helping to distribute weight and increase the ladder's overall stability, especially when extended to significant heights. This design makes the Bangor ladder particularly useful for firefighters and other rescuers when accessing elevated areas, as it enhances safety and ensures a secure setup during emergency operations.

The other types of ladders mentioned do not feature stay poles and have different designs tailored for specific purposes. For example, the Fresno ladder is a type of extension ladder that uses a different mechanism for extension and does not include stay poles. Single ladders are typically not extendable and are used for shorter access needs, while step ladders are designed for portability and typically do not reach higher elevations, focusing on use at lower heights. Therefore, the distinct feature of stay poles makes the Bangor ladder the right choice in this context.