### Question
How does EMISSION STANDARDS FOR MOVING SOURCES define heavy duty vehicle?


### Answer
Under *42 U.S.C. § 7521*, **heavy duty vehicle** is defined as:

> a truck, bus, or other vehicle manufactured primarily for use on the public streets, roads, and highways (not including any vehicle operated exclusively on a rail or rails) which has a gross vehicle weight (as determined under regulations promulgated by the Administrator) in excess of six thousand pounds

#### Citation:
  - *42 U.S.C. § 7521*
  - Heading: **CHAPTER 85-AIR POLLUTION PREVENTION AND CONTROL > SUBCHAPTER II-EMISSION STANDARDS FOR MOVING SOURCES > Part A-Motor Vehicle Emission and Fuel Standards**

