# Signals.

- **operation:** document
- **citation:** 49 CFR 176.176
- **title:** Signals.
- **source type:** regulation
- **agency:** Pipeline and Hazardous Materials Safety Administration
- **status:** current
- **official:** true
- **published on:** Not available
- **effective on:** 2026-08-18
- **summary:** 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.
- **machine formats:** - **json:** https://regulus.evalyn.ai/document/49-cfr-176-176.json
- **markdown:** https://regulus.evalyn.ai/document/49-cfr-176-176.md
- **app url:** https://regulus.evalyn.ai/document/49-cfr-176-176
- **source url:** https://www.ecfr.gov/on/2026-08-18/title-49/section-176.176
**body:**

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.
- **truncated:** false
- **body characters:** 250