### Question
How is the term Federal-aid system defined?


### Answer
The term **Federal-aid system** is defined in *23 U.S.C. § 101* as the following:

> any of the Federal-aid highway systems described in section 103

#### Citation:
  - *23 U.S.C. § 101*
  - Heading: **CHAPTER 1-FEDERAL-AID HIGHWAYS > SUBCHAPTER I-GENERAL PROVISIONS**

