49 C.F.R. § 234.253 Flashing light units and lamp voltage.
Title 49 - Transportation
(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.
Title 49: Transportation
PART 234—GRADE CROSSING SIGNAL SYSTEM SAFETY
Subpart D—Maintenance, Inspection, and Testing
Inspections and Tests
§ 234.253 Flashing light units and lamp voltage.
