# Federal Motor Vehicle Safety Standards; Rear Impact Guards; Final Rule
> **National Highway Traffic Safety Administration** · Final rule. · Published 2004-11-19 · Effective 2004-12-20 · 69 FR 67663
## Document
- **Document number:** 04-25703
- **Category:** fmvss
- **Sub-agency:** National Highway Traffic Safety Administration
- **Federal Register citation:** 69 FR 67663
- **CFR reference:** 49 CFR 571
- **Publication date:** 2004-11-19
- **Effective date:** 2004-12-20
- **DOT docket:** Docket No. NHTSA-2004-19033
## Abstract

This document amends the Federal motor vehicle safety standard No. 224, "Rear impact protection" (FMVSS No. 224), to exclude road construction controlled horizontal discharge semitrailers (RCC horizontal discharge trailers) from the requirements of the standard. The RCC horizontal discharge trailers are used in the road construction industry to deliver asphalt to construction sites and gradually discharge asphalt mix into the paving machines overlaying the road surface. The agency has concluded that installation of the rear impact guards, as required by FMVSS No. 224, on RCC horizontal discharge trailers would interfere with their intended function and is therefore impracticable due to the unique design and purpose of these vehicles.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2004/11/19/04-25703/federal-motor-vehicle-safety-standards-rear-impact-guards-final-rule)
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