# Federal Motor Vehicle Safety Standards; Metric Conversion
> **National Highway Traffic Safety Administration** · Final rule. · Published 1998-05-27 · Effective 1999-05-27 · 63 FR 28922
## Document
- **Document number:** 98-13431
- **Category:** fmvss
- **Sub-agency:** National Highway Traffic Safety Administration
- **Federal Register citation:** 63 FR 28922
- **CFR reference:** 49 CFR 571
- **Publication date:** 1998-05-27
- **Effective date:** 1999-05-27
- **DOT docket:** Docket No. NHTSA-98-3836
## Abstract

This document revises selected Federal Motor Vehicle Safety Standards (FMVSS) by converting English measurements specified in those standards to metric measurements. This is one of several rulemaking actions that NHTSA is undertaking to implement the Federal policy that the metric system of measurement is the preferred system of weights and measures for United States trade and commerce. The conversions are not intended to make any changes in the stringency of the affected FMVSS. A companion final rule published in today's Federal Register converts English measurements in selected safety standards on tires to metric measurements.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1998/05/27/98-13431/federal-motor-vehicle-safety-standards-metric-conversion)
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