49 CFR § 234.217 - Flashing light units.

---
identifier: "/us/cfr/t49/s234.217"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "49 CFR § 234.217 - Flashing light units."
title_number: 49
title_name: "Transportation"
section_number: "234.217"
section_name: "Flashing light units."
chapter_name: "FEDERAL RAILROAD ADMINISTRATION, DEPARTMENT OF TRANSPORTATION"
part_number: "234"
part_name: "GRADE CROSSING SAFETY"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "49 U.S.C. 20103, 20107, 20152, 20160, 21301, 21304, 21311, 22907 note; 28 U.S.C. 2461 note; and 49 CFR 1.89."
regulatory_source: "61 FR 31806, June 20, 1996, unless otherwise noted."
cfr_part: "234"
---


# 234.217 Flashing light units.

(a) Each flashing light unit shall be properly positioned and aligned and shall be visible to a highway user approaching the crossing.

(b) Each flashing light unit shall be maintained to prevent dust and moisture from entering the interior of the unit. Roundels and reflectors shall be clean and in good condition.

(c) All light units shall flash alternately. The number of flashes per minute for each light unit shall be 35 minimum and 65 maximum.