# Parts and Accessories Necessary for Safe Operation; General Amendments
> **National Highway Traffic Safety Administration** · Final rule. · Published 2005-08-15 · Effective 2005-09-14 · 70 FR 48008
## Document
- **Document number:** 05-14259
- **Category:** fmvss
- **Sub-agency:** National Highway Traffic Safety Administration
- **Federal Register citation:** 70 FR 48008
- **CFR reference:** 49 CFR 390
- **Publication date:** 2005-08-15
- **Effective date:** 2005-09-14
- **DOT docket:** Docket No. FMCSA-1997-2364
## Abstract

FMCSA amends part 393 of the Federal Motor Carrier Safety Regulations (FMCSRs), Parts and Accessories Necessary for Safe Operation. The amendments are intended to remove obsolete and redundant regulations; respond to several petitions for rulemaking; provide improved definitions of vehicle types, systems, and components; resolve inconsistencies between part 393 and the National Highway Traffic Safety Administration's Federal Motor Vehicle Safety Standards (49 CFR part 571); and codify certain FMCSA regulatory guidance concerning the requirements of part 393. Generally, the amendments do not involve the establishment of new or more stringent requirements, but a clarification of existing requirements. This action is intended to make many sections more concise, easier to understand and more performance oriented.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2005/08/15/05-14259/parts-and-accessories-necessary-for-safe-operation-general-amendments)
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