Which option is described as more mobile than rigging and used for structures under 40 feet high?

• A. Scaffolds
• B. Rigging
• C. Boat
• D. Shadow Vehicle

Answer: (A)

Access equipment for working on structures at relatively low heights and how easily it can be moved is being looked at here. Scaffolds provide a portable, stable working platform that can be assembled, repositioned, and moved along a structure without needing extensive setup each time. This makes them more mobile for tasks under 40 feet tall, compared with rigging, which relies on suspended lines and anchor points and is generally less convenient to relocate for short, frequent work. Rigging is used for lifting or supporting loads and can be more cumbersome to reposition, especially when access needs are at lower heights. The other options—boats and shadow vehicles—aren’t typical means of providing a mobile working platform for bridge work at these heights. So scaffolds fit the description best.