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passenger vehicle

Defined in 2 places across 2 titles of the United States Code.

For purposes of this subchapter, the term “passenger vehicle” means any 4-wheeled vehicle—

(A) which is manufactured primarily for use on public streets, roads, and highways, and

(B) which is rated at 6,000 pounds unloaded gross vehicle weight or less.

Source

The terms "passenger vehicle", "light truck", and "heavy truck" have the meanings given those terms in article 1 of the automotive appendix.

Source