The international color code used by utility locators to mark an underground gas line is:

The international color code used by utility locators to mark an underground gas line is:

• A. Blue
• B. Orange
• C. Yellow
• D. Red

Answer: (C)

Gas lines are marked in yellow. This color coding helps utility crews quickly identify underground lines and prevent dangerous digging near gas services. The system uses yellow specifically for gas and petroleum gas, while other colors denote different utilities—for example, red for electric power, blue for potable water, orange for communications, and green for sewer. Local variations exist, but yellow is the standard indicator for gas lines in most international conventions.

Gas lines are marked in yellow. This color coding helps utility crews quickly identify underground lines and prevent dangerous digging near gas services. The system uses yellow specifically for gas and petroleum gas, while other colors denote different utilities—for example, red for electric power, blue for potable water, orange for communications, and green for sewer. Local variations exist, but yellow is the standard indicator for gas lines in most international conventions.