What is a safety requirement for all exposed surfaces of mobile ladders?

The requirement for all exposed surfaces of mobile ladders to be free from sharp edges, burrs, or other hazards is essential for ensuring worker safety. This standard is aimed at preventing injury during use, as sharp edges or protruding elements can cause cuts, scrapes, or other serious injuries to those handling or working near the ladder. Maintaining smooth and hazard-free surfaces minimizes the risk of accidents and enhances the overall safety of ladder operations, which is especially crucial in environments where workers may be frequently maneuvering around or using ladders.

The other choices do not directly address the fundamental safety concerns associated with exposed surfaces of mobile ladders. While protective padding, safety colors, or specific materials like metal can be important in different contexts, they do not specifically target the immediate risk of injury from sharp or rough surfaces. Thus, the focus remains on ensuring that these surfaces are safe and free from any features that could pose a physical hazard to users.