Which type of saw is primarily used for rough cutting of larger pieces of wood?

The chainsaw is primarily used for rough cutting of larger pieces of wood due to its powerful engine and long, sharp cutting chain. It is designed to handle substantial sizes of logs and branches with ease, making it ideal for tasks such as tree felling, limbing, and bucking. The chainsaw's ability to make deep and rapid cuts allows firefighters to quickly create access routes through forested areas during wildland firefighting or to clear paths in urban settings where large wood debris might obstruct movement.

In contrast, the other saw types listed have specific functions that limit their effectiveness for large, rough-cutting tasks. For instance, a keyhole saw is intended for cutting intricate curves and small openings, making it unsuitable for substantial wood. A coping saw is used for detailed work and tight curves, while a hacksaw is designed for metal cutting and would not be efficient for wood at all. Thus, the chainsaw's design and capabilities uniquely position it as the best choice for rough cutting larger pieces of wood.