These cranes have 4-wheel steering and are typically driven and operated from the same cab.

• A. Rough terrain cranes (RT)
• B. All-terrain cranes (AT)
• C. Crawler cranes
• D. Tower cranes

Answer: (A)

Four-wheel steering is built to keep a crane nimble and stable when moving on rough, uneven ground, which is exactly what rough-terrain cranes are designed for. They ride on a four-wheel-drive chassis and use steering on all wheels to negotiate tight spaces and soft surfaces without losing balance. The operator sits in the same cab that drives the vehicle and also controls the crane, so both movement and lifting are managed from one place. That combination—four-wheel steering on a mobile, on-site crane with the driver and crane controls in the same cab—is a hallmark of rough-terrain cranes. Crawler cranes use tracks rather than wheels, so they don’t rely on wheel steering; tower cranes are fixed structures on site, not mobile; all-terrain cranes can travel on roads as well as rough ground, but the description given aligns most specifically with rough-terrain cranes.