49 CFR § 176.176 - Signals.

---
identifier: "/us/cfr/t49/s176.176"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "49 CFR § 176.176 - Signals."
title_number: 49
title_name: "Transportation"
section_number: "176.176"
section_name: "Signals."
chapter_name: "PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION"
subchapter_number: "C"
subchapter_name: "HAZARDOUS MATERIALS REGULATIONS"
part_number: "176"
part_name: "CARRIAGE BY VESSEL"
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. 5101-5128; 49 CFR 1.81 and 1.97."
regulatory_source: "Amdt. 176-1, 41 FR 16110, Apr. 15, 1976, unless otherwise noted."
cfr_part: "176"
---


# 176.176 Signals.

When Class 1 (explosive) materials are being loaded, handled, or unloaded on a vessel, the vessel must exhibit the following signals:

(a) By day, flag “B” (Bravo) of the international code of signals; and

(b) By night, an all-round fixed red light.