### Question
How is the "heavy-duty truck" defined?


### Answer
The term **heavy-duty truck** is defined in *42 U.S.C. § 16131* as follows -

> given the term “heavy duty vehicle” in section 7521 of this title.

#### Citation:
  - *42 U.S.C. § 16131*
  - Heading: **CHAPTER 149-NATIONAL ENERGY POLICY AND PROGRAMS > SUBCHAPTER VII-VEHICLES AND FUELS > Part F-Diesel Emissions Reduction**

