Which term is used for the vertical distance used in speed calculations?

• A. Speed Measurement
• B. Overrun
• C. Vertical Distance
• D. Installation Weight

Answer: (C)

The term described is the vertical distance. In speed calculations for escalators and moving walks, we focus on how far the car rises vertically in a given time, not how long the belt is or how it trails along a slope. Expressing speed as vertical distance per unit time (for example, meters per second or feet per minute of rise) reflects the actual passenger experience—the rate at which height is gained. This makes comparisons and performance standards consistent regardless of incline angle or belt length.

The other options don’t fit because speed measurement is the act of determining speed, not the distance used in the calculation; overrun refers to extra travel beyond the intended movement; installation weight is the weight of the equipment.