Business · 17/07/1995Updated: 10/18/2026 · 1 min read

NHTSA Denies Petition from Koito Manufacturing Co., Ltd. for Rulemaking on Headlamp Moisture Requirements

Summary

The National Highway Traffic Safety Administration (NHTSA) has denied a petition from Koito Manufacturing Co., Ltd. to relax the performance standard for headlamps to allow for permissible moisture presence, citing concerns over long-term photometric degradation and the need for a more rigorous testing protocol.

Original source language: Federal Register — National Highway Traffic Safety AdministrationOpen original release →

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