### Question
How is the term project to maintain minimum levels of retroreflectivity defined?


### Answer
The term **project to maintain minimum levels of retroreflectivity** is defined in *23 U.S.C. § 148* as the following:

> a project that is designed to maintain a highway sign or pavement marking retroreflectivity at or above the minimum levels prescribed in Federal or State regulations

#### Citation:
  - *23 U.S.C. § 148*
  - Heading: **CHAPTER 1-FEDERAL-AID HIGHWAYS**

