Which stops the chairlift if an obstruction detected?

• A. Traveling Cable Pivot
• B. Manual Operation
• C. Rack and Pinion Drive
• D. Footrest Safety

Answer: (D)

The situation is governed by obstruction-sensing safety devices that stop the chairlift to prevent injury. The footrest safety is specifically designed to detect something under or around the footrest, and when it senses an obstruction, it immediately interrupts the drive circuit so the chairlift stops. This makes it the best answer because it directly fulfills the function of halting movement in response to an obstacle.

The remaining items don’t provide automatic obstruction stopping. The traveling cable pivot is a part of the drive system’s cables and doesn’t act as an obstruction sensor. Manual operation is a way to run the system by hand, not a sensor-triggered stop for obstructions. Rack and pinion drive is the mechanical means of motion transfer, not a sensor that stops for obstacles.