### Question
How does the law define low emission and energy-efficient vehicle?


### Answer
Under *23 U.S.C. § 166*, **low emission and energy-efficient vehicle** is defined as:

> a vehicle that—


(A) has been certified by the Administrator as meeting the Tier II emission level established in regulations prescribed by the Administrator under section 202(i) of the Clean Air Act (42 U.S.C. 7521(i)) for that make and model year vehicle

#### Citation:
  - *23 U.S.C. § 166*
  - Heading: **CHAPTER 1-FEDERAL-AID HIGHWAYS**

