# Federal Motor Vehicle Safety Standards; Lamps, Reflective Devices and Associated Equipment
> **National Highway Traffic Safety Administration** · Final rule. · Published 1998-02-18 · Effective 1998-02-18 · 63 FR 8143
## Document
- **Document number:** 98-3904
- **Category:** fmvss
- **Sub-agency:** National Highway Traffic Safety Administration
- **Federal Register citation:** 63 FR 8143
- **CFR reference:** 49 CFR 571
- **Publication date:** 1998-02-18
- **Effective date:** 1998-02-18
- **DOT docket:** Docket No. NHTSA-98-3452
## Abstract

This document amends the Federal motor vehicle safety standard on lighting to permit white reflex reflectors designed to be mounted horizontally in trailer and truck tractor conspicuity treatments to be mounted vertically in upper rear corner locations if they comply with appropriate photometric requirements for off-axis light entrance angles. This action simplifies compliance with the standard.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1998/02/18/98-3904/federal-motor-vehicle-safety-standards-lamps-reflective-devices-and-associated-equipment)
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