What system does NFPA 13 detail for piping running under roadways?

NFPA 13 specifies guidelines for the installation of sprinkler systems, including those located underground. When it comes to piping that runs under roadways, the standards primarily focus on underground sprinkler systems. This type of system is essential because it involves specific considerations for the structural integrity, accessibility, and maintenance of pipes that are buried beneath roadways. The applicability of NFPA 13 ensures that design and installation practices meet safety and performance standards, ensuring that water distribution for fire protection is reliable, even in locations where pipes are exposed to heavy loads and other stress factors from vehicular traffic.

In contrast, the other options do not accurately address the context of piping under roadways as specifically outlined by NFPA 13. Fire alarm systems are focused on detection and notification rather than water distribution. Flammable liquid systems pertain to the handling and management of flammable substances, which does not directly relate to the fire protection water delivery systems specified for underground installations. Minor hazard systems refer to classifications of occupancy with minimal fire risk, which again does not directly correlate with the requirements for underground piping systems per NFPA 13.