What type of lines can be used effectively in both hydrant and non-hydrant areas?

Relay lines are capable of being used effectively in both hydrant and non-hydrant areas because they are designed specifically to transport large volumes of water over long distances. In situations where direct access to a fire hydrant is unavailable, relay lines can be utilized to connect a water source to the fire scene by using portable pumps or tankers, allowing firefighters to establish a continuous water supply even in areas lacking traditional hydrant infrastructure.

Their versatility makes them crucial in suburban firefighting operations, which often involve varied water supply scenarios. This flexibility ensures that even in less developed regions where access to hydrants is limited or in situations where hydrants are obstructed or non-functional, firefighters can still effectively manage and combat fires by utilizing a relay system.