What is the minimum rated vehicle height of a ladder?

• A. At least 50 feet, measured from the outermost rung to the ground.
• B. At least 60 feet, measured from ground to tip.
• C. At least 75 feet, measured from base to top.
• D. At least 40 feet, measured along the ladder axis.

Answer: (A)

Ladder height rating is about the vertical reach you get when the ladder is extended and placed for use. The rating is defined as the distance from the ground up to the outermost rung—the top rung a firefighter can stand on or step to—when the ladder is fully erected. That’s why the minimum is specified as at least 50 feet measured from the outermost rung to the ground. This focuses on the usable height you can actually reach, not the ladder’s overall length or other dimensions. Measuring from ground to the tip would include any portion beyond the usable rung and isn’t how the rating is defined; base-to-top or along-the-ladder-axis measurements don’t reflect the vertical reach firefighters rely on.