Which object is cleared by the side or alley arms as part of their function?

• A. Buildings and trees
• B. Highways
• C. Telephone lines
• D. Transformer stations

Answer: (A)

This question hinges on understanding what side or alley arms are designed to do in operation: they clear large obstructions that could block the device’s path. In tight urban or alley settings, these arms extend to physically push aside or remove objects that would hinder movement or function, making a clear corridor for the equipment to operate. Buildings and trees are exactly the type of substantial, immovable obstacles that such arms would be used to clear in the course of performing their task. The other options—highways, telephone lines, transformer stations—are fixed infrastructure or routes themselves, not objects that the arms are meant to clear as part of their ordinary function.