What does the color yellow typically indicate in utility marking?

• A. Water lines
• B. Caution for underground gas lines
• C. Communication lines
• D. Electric power lines

Answer: (B)

The color yellow is generally used to indicate caution for underground gas lines in utility marking. This practice is critical for ensuring safety during construction and excavation activities, as hitting a gas line can lead to significant hazards, including explosions and gas leaks. By marking these lines in yellow, it alerts workers to proceed with caution, reminding them to avoid digging in those areas unless they have confirmed the safety measures and guidelines are followed. Proper identification of utility lines is essential to prevent accidents and ensure that all underground utilities are respected during any ground disturbance activities.