Which of the following is NOT part of the definition of plumbing?

The definition of plumbing encompasses systems that are primarily designed for the transport and management of water and waste within a building. This includes a drainage system, which manages the removal of sewage and wastewater; a venting system, which ensures that air can enter and exit the plumbing system to prevent vacuum formation; and a water system, responsible for distributing clean water for various uses within a structure.

In contrast, a road construction system pertains to the infrastructure associated with roadways and does not relate to the functions of plumbing. Therefore, it is not included in the definition of plumbing. Understanding the specific roles and components of plumbing helps clarify why the drainage, venting, and water systems are essential parts of this field, while road construction stands outside of it.