### Question
How is the term substantial completion defined?


### Answer
The term **substantial completion** is defined in *23 U.S.C. § 181* as the following:

> the opening of a project to vehicular or passenger traffic

#### Citation:
  - *23 U.S.C. § 181*
  - Heading: **CHAPTER 1-FEDERAL-AID HIGHWAYS > SUBCHAPTER II-INFRASTRUCTURE FINANCE**

