### Question
What is the definition of primary offense?


### Answer
The definition of **primary offense** is as follows in *23 U.S.C. § 405*:

> an offense for which a law enforcement officer may stop a vehicle solely for the purpose of issuing a citation in the absence of evidence of another offense

#### Citation:
  - *23 U.S.C. § 405*
  - Heading: **CHAPTER 4-HIGHWAY SAFETY**

