49 CFR 234.253 - Flashing light units and lamp voltage.

Regulations last checked for updates: Feb 06, 2026

Title 49 - Transportation last revised: Jan 27, 2026

View all text of Subpart D [§ 234.201 - § 234.275]

§ 234.253 - Flashing light units and lamp voltage.

(a) Each flashing light unit shall be inspected when installed and at least once every twelve months for proper alignment and frequency of flashes in accordance with installation specifications.

(b) Lamp voltage shall be tested when installed and at least once every 12 months thereafter.

(c) Each flashing light unit shall be inspected for proper visibility, dirt and damage to roundels and reflectors at least once each month.

authority: 49 U.S.C. 20103,20107,20152,20160,21301,21304,21311,22907; 28 U.S.C. 2461 note; and 49 CFR 1.89

source: 61 FR 31806, June 20, 1996, unless otherwise noted.

cite as: 49 CFR 234.253