---
kind: "section"
citation: "49 C.F.R. § 523.6"
title: "49"
number: "523.6"
heading: "Heavy-duty vehicle."
url: "https://uscodex.org/cfr/49/523.6"
---

# §523.6. Heavy-duty vehicle.

- (a) A heavy-duty vehicle is any commercial medium- or heavy-duty on-highway vehicle or a work truck, as defined in 49 U.S.C. [32901(a)(7)](/usc/49/32901.md?p=a-7) and [(19)](/usc/49/32901.md?p=a-19). For the purpose of this section, heavy-duty vehicles are divided into four regulatory categories as follows:
  - (1) Heavy-duty pickup trucks and vans;
  - (2) Heavy-duty vocational vehicles;
  - (3) Truck tractors with a GVWR above 26,000 pounds; and
  - (4) **Heavy-duty trailers.**
- (b) The heavy-duty vehicle classification does not include vehicles excluded as specified in [49 CFR 535.3](/cfr/49/535.3.md).

## Notes

### Amendments

[81 FR 74237, Oct. 25, 2016, as amended at 89 FR 52945, June 24, 2024]

### Authority

Authority: 49 U.S.C. 32901; delegation of authority at 49 CFR 1.95.

### Amendments

[81 FR 74237, Oct. 25, 2016, as amended at 89 FR 52945, June 24, 2024]