How is the horizontal reach of an aerial ladder defined?

• A. From the base of the ladder to the tip.
• B. From the center line of the turntable to the outermost rung at the tip of the ladder's last section.
• C. From the center of the turntable to the top rung.
• D. From the center line of the ladder to the outermost rung at the tip.

Answer: (B)

Horizontal reach is the distance the aerial ladder can extend outward from the vehicle, measured along a horizontal plane from the turntable’s centerline to the furthest rung at the tip of the ladder’s last section. This reference point uses the turntable as the fixed pivot, so the measurement reflects how far you can reach horizontally regardless of ladder angle or thickness. Measuring from the base to the tip would mix in overall length rather than reach, and using the top rung or a different reference would not capture the ladder’s full extended reach. The outermost rung at the tip represents the ladder’s farthest usable end in a horizontal projection.