The ANSI uniform color code for marking underground hazardous liquid and gas pipeline facilities is __________.

The ANSI uniform color code for marking underground hazardous liquid and gas pipeline facilities is yellow. This color designation is specifically chosen to alert individuals to the presence of hazardous materials, which can pose significant safety risks. Yellow is widely recognized as a cautionary color, signaling the potential danger associated with underground pipelines carrying flammable or hazardous liquids and gases.

The use of color codes in pipeline marking is crucial for ensuring safety during excavation and maintenance activities. When workers see yellow markings, they are reminded to exercise caution and take necessary precautions to prevent accidental ruptures or leaks. By standardizing these color codes, ANSI helps promote clear and consistent communication about the presence of hazardous infrastructures across various regions and industries.